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Wed, 10 Nov 2021 18:07:42 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:22 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-2-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 01/17] perf: Protect perf_guest_cbs with RCU From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636597416420100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Protect perf_guest_cbs with RCU to fix multiple possible errors. Luckily, all paths that read perf_guest_cbs already require RCU protection, e.g. to protect the callback chains, so only the direct perf_guest_cbs touchpoints need to be modified. Bug #1 is a simple lack of WRITE_ONCE/READ_ONCE behavior to ensure perf_guest_cbs isn't reloaded between a !NULL check and a dereference. Fixed via the READ_ONCE() in rcu_dereference(). Bug #2 is that on weakly-ordered architectures, updates to the callbacks themselves are not guaranteed to be visible before the pointer is made visible to readers. Fixed by the smp_store_release() in rcu_assign_pointer() when the new pointer is non-NULL. Bug #3 is that, because the callbacks are global, it's possible for readers to run in parallel with an unregisters, and thus a module implementing the callbacks can be unloaded while readers are in flight, resulting in a use-after-free. Fixed by a synchronize_rcu() call when unregistering callbacks. Bug #1 escaped notice because it's extremely unlikely a compiler will reload perf_guest_cbs in this sequence. perf_guest_cbs does get reloaded for future derefs, e.g. for ->is_user_mode(), but the ->is_in_guest() guard all but guarantees the consumer will win the race, e.g. to nullify perf_guest_cbs, KVM has to completely exit the guest and teardown down all VMs before KVM start its module unload / unregister sequence. This also makes it all but impossible to encounter bug #3. Bug #2 has not been a problem because all architectures that register callbacks are strongly ordered and/or have a static set of callbacks. But with help, unloading kvm_intel can trigger bug #1 e.g. wrapping perf_guest_cbs with READ_ONCE in perf_misc_flags() while spamming kvm_intel module load/unload leads to: BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP CPU: 6 PID: 1825 Comm: stress Not tainted 5.14.0-rc2+ #459 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:perf_misc_flags+0x1c/0x70 Call Trace: perf_prepare_sample+0x53/0x6b0 perf_event_output_forward+0x67/0x160 __perf_event_overflow+0x52/0xf0 handle_pmi_common+0x207/0x300 intel_pmu_handle_irq+0xcf/0x410 perf_event_nmi_handler+0x28/0x50 nmi_handle+0xc7/0x260 default_do_nmi+0x6b/0x170 exc_nmi+0x103/0x130 asm_exc_nmi+0x76/0xbf Fixes: 39447b386c84 ("perf: Enhance perf to allow for guest statistic colle= ction from host") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson Reviewed-by: Paolo Bonzini --- arch/arm/kernel/perf_callchain.c | 17 +++++++++++------ arch/arm64/kernel/perf_callchain.c | 18 ++++++++++++------ arch/csky/kernel/perf_callchain.c | 6 ++++-- arch/nds32/kernel/perf_event_cpu.c | 17 +++++++++++------ arch/riscv/kernel/perf_callchain.c | 7 +++++-- arch/x86/events/core.c | 17 +++++++++++------ arch/x86/events/intel/core.c | 9 ++++++--- include/linux/perf_event.h | 13 ++++++++++++- kernel/events/core.c | 13 ++++++++++--- 9 files changed, 82 insertions(+), 35 deletions(-) diff --git a/arch/arm/kernel/perf_callchain.c b/arch/arm/kernel/perf_callch= ain.c index 3b69a76d341e..1626dfc6f6ce 100644 --- a/arch/arm/kernel/perf_callchain.c +++ b/arch/arm/kernel/perf_callchain.c @@ -62,9 +62,10 @@ user_backtrace(struct frame_tail __user *tail, void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs= *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct frame_tail __user *tail; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { /* We don't support guest os callchain now */ return; } @@ -98,9 +99,10 @@ callchain_trace(struct stackframe *fr, void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_re= gs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe fr; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { /* We don't support guest os callchain now */ return; } @@ -111,18 +113,21 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx= *entry, struct pt_regs *re =20 unsigned long perf_instruction_pointer(struct pt_regs *regs) { - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) - return perf_guest_cbs->get_guest_ip(); + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + + if (guest_cbs && guest_cbs->is_in_guest()) + return guest_cbs->get_guest_ip(); =20 return instruction_pointer(regs); } =20 unsigned long perf_misc_flags(struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); int misc =3D 0; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { - if (perf_guest_cbs->is_user_mode()) + if (guest_cbs && guest_cbs->is_in_guest()) { + if (guest_cbs->is_user_mode()) misc |=3D PERF_RECORD_MISC_GUEST_USER; else misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; diff --git a/arch/arm64/kernel/perf_callchain.c b/arch/arm64/kernel/perf_ca= llchain.c index 4a72c2727309..86d9f2013172 100644 --- a/arch/arm64/kernel/perf_callchain.c +++ b/arch/arm64/kernel/perf_callchain.c @@ -102,7 +102,9 @@ compat_user_backtrace(struct compat_frame_tail __user *= tail, void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + + if (guest_cbs && guest_cbs->is_in_guest()) { /* We don't support guest os callchain now */ return; } @@ -147,9 +149,10 @@ static bool callchain_trace(void *data, unsigned long = pc) void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe frame; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { /* We don't support guest os callchain now */ return; } @@ -160,18 +163,21 @@ void perf_callchain_kernel(struct perf_callchain_entr= y_ctx *entry, =20 unsigned long perf_instruction_pointer(struct pt_regs *regs) { - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) - return perf_guest_cbs->get_guest_ip(); + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + + if (guest_cbs && guest_cbs->is_in_guest()) + return guest_cbs->get_guest_ip(); =20 return instruction_pointer(regs); } =20 unsigned long perf_misc_flags(struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); int misc =3D 0; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { - if (perf_guest_cbs->is_user_mode()) + if (guest_cbs && guest_cbs->is_in_guest()) { + if (guest_cbs->is_user_mode()) misc |=3D PERF_RECORD_MISC_GUEST_USER; else misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; diff --git a/arch/csky/kernel/perf_callchain.c b/arch/csky/kernel/perf_call= chain.c index ab55e98ee8f6..35318a635a5f 100644 --- a/arch/csky/kernel/perf_callchain.c +++ b/arch/csky/kernel/perf_callchain.c @@ -86,10 +86,11 @@ static unsigned long user_backtrace(struct perf_callcha= in_entry_ctx *entry, void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); unsigned long fp =3D 0; =20 /* C-SKY does not support virtualization. */ - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) + if (guest_cbs && guest_cbs->is_in_guest()) return; =20 fp =3D regs->regs[4]; @@ -110,10 +111,11 @@ void perf_callchain_user(struct perf_callchain_entry_= ctx *entry, void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe fr; =20 /* C-SKY does not support virtualization. */ - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { pr_warn("C-SKY does not support perf in guest mode!"); return; } diff --git a/arch/nds32/kernel/perf_event_cpu.c b/arch/nds32/kernel/perf_ev= ent_cpu.c index 0ce6f9f307e6..f38791960781 100644 --- a/arch/nds32/kernel/perf_event_cpu.c +++ b/arch/nds32/kernel/perf_event_cpu.c @@ -1363,6 +1363,7 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); unsigned long fp =3D 0; unsigned long gp =3D 0; unsigned long lp =3D 0; @@ -1371,7 +1372,7 @@ perf_callchain_user(struct perf_callchain_entry_ctx *= entry, =20 leaf_fp =3D 0; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { /* We don't support guest os callchain now */ return; } @@ -1479,9 +1480,10 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe fr; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { /* We don't support guest os callchain now */ return; } @@ -1493,20 +1495,23 @@ perf_callchain_kernel(struct perf_callchain_entry_c= tx *entry, =20 unsigned long perf_instruction_pointer(struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + /* However, NDS32 does not support virtualization */ - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) - return perf_guest_cbs->get_guest_ip(); + if (guest_cbs && guest_cbs->is_in_guest()) + return guest_cbs->get_guest_ip(); =20 return instruction_pointer(regs); } =20 unsigned long perf_misc_flags(struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); int misc =3D 0; =20 /* However, NDS32 does not support virtualization */ - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { - if (perf_guest_cbs->is_user_mode()) + if (guest_cbs && guest_cbs->is_in_guest()) { + if (guest_cbs->is_user_mode()) misc |=3D PERF_RECORD_MISC_GUEST_USER; else misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_ca= llchain.c index 0bb1854dce83..8ecfc4c128bc 100644 --- a/arch/riscv/kernel/perf_callchain.c +++ b/arch/riscv/kernel/perf_callchain.c @@ -56,10 +56,11 @@ static unsigned long user_backtrace(struct perf_callcha= in_entry_ctx *entry, void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); unsigned long fp =3D 0; =20 /* RISC-V does not support perf in guest mode. */ - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) + if (guest_cbs && guest_cbs->is_in_guest()) return; =20 fp =3D regs->s0; @@ -78,8 +79,10 @@ static bool fill_callchain(void *entry, unsigned long pc) void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + /* RISC-V does not support perf in guest mode. */ - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { pr_warn("RISC-V does not support perf in guest mode!"); return; } diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 38b2c779146f..32cec290d3ad 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2768,10 +2768,11 @@ static bool perf_hw_regs(struct pt_regs *regs) void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_re= gs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct unwind_state state; unsigned long addr; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { /* TODO: We don't support guest os callchain now */ return; } @@ -2871,10 +2872,11 @@ perf_callchain_user32(struct pt_regs *regs, struct = perf_callchain_entry_ctx *ent void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs= *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stack_frame frame; const struct stack_frame __user *fp; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->is_in_guest()) { /* TODO: We don't support guest os callchain now */ return; } @@ -2951,18 +2953,21 @@ static unsigned long code_segment_base(struct pt_re= gs *regs) =20 unsigned long perf_instruction_pointer(struct pt_regs *regs) { - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) - return perf_guest_cbs->get_guest_ip(); + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + + if (guest_cbs && guest_cbs->is_in_guest()) + return guest_cbs->get_guest_ip(); =20 return regs->ip + code_segment_base(regs); } =20 unsigned long perf_misc_flags(struct pt_regs *regs) { + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); int misc =3D 0; =20 - if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { - if (perf_guest_cbs->is_user_mode()) + if (guest_cbs && guest_cbs->is_in_guest()) { + if (guest_cbs->is_user_mode()) misc |=3D PERF_RECORD_MISC_GUEST_USER; else misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index 603964408d2d..cde29bd5bb53 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -2837,6 +2837,7 @@ static int handle_pmi_common(struct pt_regs *regs, u6= 4 status) { struct perf_sample_data data; struct cpu_hw_events *cpuc =3D this_cpu_ptr(&cpu_hw_events); + struct perf_guest_info_callbacks *guest_cbs; int bit; int handled =3D 0; u64 intel_ctrl =3D hybrid(cpuc->pmu, intel_ctrl); @@ -2903,9 +2904,11 @@ static int handle_pmi_common(struct pt_regs *regs, u= 64 status) */ if (__test_and_clear_bit(GLOBAL_STATUS_TRACE_TOPAPMI_BIT, (unsigned long = *)&status)) { handled++; - if (unlikely(perf_guest_cbs && perf_guest_cbs->is_in_guest() && - perf_guest_cbs->handle_intel_pt_intr)) - perf_guest_cbs->handle_intel_pt_intr(); + + guest_cbs =3D perf_get_guest_cbs(); + if (unlikely(guest_cbs && guest_cbs->is_in_guest() && + guest_cbs->handle_intel_pt_intr)) + guest_cbs->handle_intel_pt_intr(); else intel_pt_interrupt(); } diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 0dcfd265beed..318c489b735b 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1240,7 +1240,18 @@ extern void perf_event_bpf_event(struct bpf_prog *pr= og, enum perf_bpf_event_type type, u16 flags); =20 -extern struct perf_guest_info_callbacks *perf_guest_cbs; +extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs; +static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void) +{ + /* + * Callbacks are RCU-protected and must be READ_ONCE to avoid reloading + * the callbacks between a !NULL check and dereferences, to ensure + * pending stores/changes to the callback pointers are visible before a + * non-NULL perf_guest_cbs is visible to readers, and to prevent a + * module from unloading callbacks while readers are active. + */ + return rcu_dereference(perf_guest_cbs); +} extern int perf_register_guest_info_callbacks(struct perf_guest_info_callb= acks *callbacks); extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_cal= lbacks *callbacks); =20 diff --git a/kernel/events/core.c b/kernel/events/core.c index f2253ea729a2..0cc775f702f8 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6526,18 +6526,25 @@ static void perf_pending_event(struct irq_work *ent= ry) * Later on, we might change it to a list if there is * another virtualization implementation supporting the callbacks. */ -struct perf_guest_info_callbacks *perf_guest_cbs; +struct perf_guest_info_callbacks __rcu *perf_guest_cbs; =20 int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *c= bs) { - perf_guest_cbs =3D cbs; + if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs))) + return -EBUSY; + + rcu_assign_pointer(perf_guest_cbs, cbs); return 0; } EXPORT_SYMBOL_GPL(perf_register_guest_info_callbacks); =20 int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks = *cbs) { - perf_guest_cbs =3D NULL; + if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs) !=3D cbs)) + return -EINVAL; + + rcu_assign_pointer(perf_guest_cbs, NULL); + synchronize_rcu(); return 0; } EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; 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Wed, 10 Nov 2021 18:07:44 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:23 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-3-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 02/17] KVM: x86: Register perf callbacks after calling vendor's hardware_setup() From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596511691100003 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Wait to register perf callbacks until after doing vendor hardaware setup. VMX's hardware_setup() configures Intel Processor Trace (PT) mode, and a future fix to register the Intel PT guest interrupt hook if and only if Intel PT is exposed to the guest will consume the configured PT mode. Delaying registration to hardware setup is effectively a nop as KVM's perf hooks all pivot on the per-CPU current_vcpu, which is non-NULL only when KVM is handling an IRQ/NMI in a VM-Exit path. I.e. current_vcpu will be NULL throughout both kvm_arch_init() and kvm_arch_hardware_setup(). Cc: Alexander Shishkin Cc: Artem Kashkanov Cc: stable@vger.kernel.org Acked-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/x86/kvm/x86.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c1c4e2b05a63..021b2c1ac9f0 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8567,8 +8567,6 @@ int kvm_arch_init(void *opaque) =20 kvm_timer_init(); =20 - perf_register_guest_info_callbacks(&kvm_guest_cbs); - if (boot_cpu_has(X86_FEATURE_XSAVE)) { host_xcr0 =3D xgetbv(XCR_XFEATURE_ENABLED_MASK); supported_xcr0 =3D host_xcr0 & KVM_SUPPORTED_XCR0; @@ -8600,7 +8598,6 @@ void kvm_arch_exit(void) clear_hv_tscchange_cb(); #endif kvm_lapic_exit(); - perf_unregister_guest_info_callbacks(&kvm_guest_cbs); =20 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, @@ -11149,6 +11146,8 @@ int kvm_arch_hardware_setup(void *opaque) memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); 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Wed, 10 Nov 2021 18:07:46 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:24 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-4-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 03/17] KVM: x86: Register Processor Trace interrupt hook iff PT enabled in guest From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596511808100010 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Override the Processor Trace (PT) interrupt handler for guest mode if and only if PT is configured for host+guest mode, i.e. is being used independently by both host and guest. If PT is configured for system mode, the host fully controls PT and must handle all events. Fixes: 8479e04e7d6b ("KVM: x86: Inject PMI for KVM guest") Cc: stable@vger.kernel.org Cc: Like Xu Reported-by: Alexander Shishkin Reported-by: Artem Kashkanov Acked-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/vmx/vmx.c | 1 + arch/x86/kvm/x86.c | 5 ++++- 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_hos= t.h index 2acf37cc1991..bf0a9ce53750 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1514,6 +1514,7 @@ struct kvm_x86_init_ops { int (*disabled_by_bios)(void); int (*check_processor_compatibility)(void); int (*hardware_setup)(void); + bool (*intel_pt_intr_in_guest)(void); =20 struct kvm_x86_ops *runtime_ops; }; diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 76861b66bbcf..0927d07b2efb 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7918,6 +7918,7 @@ static struct kvm_x86_init_ops vmx_init_ops __initdat= a =3D { .disabled_by_bios =3D vmx_disabled_by_bios, .check_processor_compatibility =3D vmx_check_processor_compat, .hardware_setup =3D hardware_setup, + .intel_pt_intr_in_guest =3D vmx_pt_mode_is_host_guest, =20 .runtime_ops =3D &vmx_x86_ops, }; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 021b2c1ac9f0..021d3f5364b2 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8451,7 +8451,7 @@ static struct perf_guest_info_callbacks kvm_guest_cbs= =3D { .is_in_guest =3D kvm_is_in_guest, .is_user_mode =3D kvm_is_user_mode, .get_guest_ip =3D kvm_get_guest_ip, - .handle_intel_pt_intr =3D kvm_handle_intel_pt_intr, + .handle_intel_pt_intr =3D NULL, }; =20 #ifdef CONFIG_X86_64 @@ -11146,6 +11146,8 @@ int kvm_arch_hardware_setup(void *opaque) memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); kvm_ops_static_call_update(); =20 + if (ops->intel_pt_intr_in_guest && ops->intel_pt_intr_in_guest()) + kvm_guest_cbs.handle_intel_pt_intr =3D kvm_handle_intel_pt_intr; perf_register_guest_info_callbacks(&kvm_guest_cbs); =20 if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) @@ -11176,6 +11178,7 @@ int kvm_arch_hardware_setup(void *opaque) void kvm_arch_hardware_unsetup(void) { perf_unregister_guest_info_callbacks(&kvm_guest_cbs); 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Wed, 10 Nov 2021 18:07:47 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:25 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-5-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 04/17] perf: Stop pretending that perf can handle multiple guest callbacks From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596511740100006 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Drop the 'int' return value from the perf (un)register callbacks helpers and stop pretending perf can support multiple callbacks. The 'int' returns are not future proofing anything as none of the callers take action on an error. It's also not obvious that there will ever be co-tenant hypervisors, and if there are, that allowing multiple callbacks to be registered is desirable or even correct. Opportunistically rename callbacks=3D>cbs in the affected declarations to match their definitions. No functional change intended. Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/arm64/include/asm/kvm_host.h | 4 ++-- arch/arm64/kvm/perf.c | 8 ++++---- include/linux/perf_event.h | 12 ++++++------ kernel/events/core.c | 15 ++++----------- 4 files changed, 16 insertions(+), 23 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm= _host.h index 4be8486042a7..5a76d9a76fd9 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -675,8 +675,8 @@ unsigned long kvm_mmio_read_buf(const void *buf, unsign= ed int len); int kvm_handle_mmio_return(struct kvm_vcpu *vcpu); int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa); =20 -int kvm_perf_init(void); -int kvm_perf_teardown(void); +void kvm_perf_init(void); +void kvm_perf_teardown(void); =20 long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu); gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/perf.c b/arch/arm64/kvm/perf.c index c84fe24b2ea1..a0d660cf889e 100644 --- a/arch/arm64/kvm/perf.c +++ b/arch/arm64/kvm/perf.c @@ -48,12 +48,12 @@ static struct perf_guest_info_callbacks kvm_guest_cbs = =3D { .get_guest_ip =3D kvm_get_guest_ip, }; =20 -int kvm_perf_init(void) +void kvm_perf_init(void) { - return perf_register_guest_info_callbacks(&kvm_guest_cbs); + perf_register_guest_info_callbacks(&kvm_guest_cbs); } =20 -int kvm_perf_teardown(void) +void kvm_perf_teardown(void) { - return perf_unregister_guest_info_callbacks(&kvm_guest_cbs); + perf_unregister_guest_info_callbacks(&kvm_guest_cbs); } diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 318c489b735b..98c204488496 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1252,8 +1252,8 @@ static inline struct perf_guest_info_callbacks *perf_= get_guest_cbs(void) */ return rcu_dereference(perf_guest_cbs); } -extern int perf_register_guest_info_callbacks(struct perf_guest_info_callb= acks *callbacks); -extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_cal= lbacks *callbacks); +extern void perf_register_guest_info_callbacks(struct perf_guest_info_call= backs *cbs); +extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_ca= llbacks *cbs); =20 extern void perf_event_exec(void); extern void perf_event_comm(struct task_struct *tsk, bool exec); @@ -1497,10 +1497,10 @@ perf_sw_event(u32 event_id, u64 nr, struct pt_regs = *regs, u64 addr) { } static inline void perf_bp_event(struct perf_event *event, void *data) { } =20 -static inline int perf_register_guest_info_callbacks -(struct perf_guest_info_callbacks *callbacks) { return 0; } -static inline int perf_unregister_guest_info_callbacks -(struct perf_guest_info_callbacks *callbacks) { return 0; } +static inline void perf_register_guest_info_callbacks +(struct perf_guest_info_callbacks *cbs) { } +static inline void perf_unregister_guest_info_callbacks +(struct perf_guest_info_callbacks *cbs) { } =20 static inline void perf_event_mmap(struct vm_area_struct *vma) { } =20 diff --git a/kernel/events/core.c b/kernel/events/core.c index 0cc775f702f8..eb6b9cfd0054 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6521,31 +6521,24 @@ static void perf_pending_event(struct irq_work *ent= ry) perf_swevent_put_recursion_context(rctx); } =20 -/* - * We assume there is only KVM supporting the callbacks. - * Later on, we might change it to a list if there is - * another virtualization implementation supporting the callbacks. - */ struct perf_guest_info_callbacks __rcu *perf_guest_cbs; =20 -int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *c= bs) +void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *= cbs) { if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs))) - return -EBUSY; + return; =20 rcu_assign_pointer(perf_guest_cbs, cbs); - return 0; } EXPORT_SYMBOL_GPL(perf_register_guest_info_callbacks); =20 -int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks = *cbs) +void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks= *cbs) { if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs) !=3D cbs)) - return -EINVAL; + return; =20 rcu_assign_pointer(perf_guest_cbs, NULL); synchronize_rcu(); - return 0; } EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); 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Wed, 10 Nov 2021 18:07:49 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:26 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-6-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 05/17] perf: Drop dead and useless guest "support" from arm, csky, nds32 and riscv From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596511731100004 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Drop "support" for guest callbacks from architectures that don't implement the guest callbacks. Future patches will convert the callbacks to static_call; rather than churn a bunch of arch code (that was presumably copy+pasted from x86), remove it wholesale as it's useless and at best wasting cycles. A future patch will also add a Kconfig to force architcture to opt into the callbacks to make it more difficult for uses "support" to sneak in in the future. No functional change intended. Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/arm/kernel/perf_callchain.c | 33 ++++------------------------- arch/csky/kernel/perf_callchain.c | 12 ----------- arch/nds32/kernel/perf_event_cpu.c | 34 ++++-------------------------- arch/riscv/kernel/perf_callchain.c | 13 ------------ 4 files changed, 8 insertions(+), 84 deletions(-) diff --git a/arch/arm/kernel/perf_callchain.c b/arch/arm/kernel/perf_callch= ain.c index 1626dfc6f6ce..bc6b246ab55e 100644 --- a/arch/arm/kernel/perf_callchain.c +++ b/arch/arm/kernel/perf_callchain.c @@ -62,14 +62,8 @@ user_backtrace(struct frame_tail __user *tail, void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs= *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct frame_tail __user *tail; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { - /* We don't support guest os callchain now */ - return; - } - perf_callchain_store(entry, regs->ARM_pc); =20 if (!current->mm) @@ -99,44 +93,25 @@ callchain_trace(struct stackframe *fr, void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_re= gs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe fr; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { - /* We don't support guest os callchain now */ - return; - } - arm_get_current_stackframe(regs, &fr); walk_stackframe(&fr, callchain_trace, entry); } =20 unsigned long perf_instruction_pointer(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - - if (guest_cbs && guest_cbs->is_in_guest()) - return guest_cbs->get_guest_ip(); - return instruction_pointer(regs); } =20 unsigned long perf_misc_flags(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); int misc =3D 0; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { - if (guest_cbs->is_user_mode()) - misc |=3D PERF_RECORD_MISC_GUEST_USER; - else - misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; - } else { - if (user_mode(regs)) - misc |=3D PERF_RECORD_MISC_USER; - else - misc |=3D PERF_RECORD_MISC_KERNEL; - } + if (user_mode(regs)) + misc |=3D PERF_RECORD_MISC_USER; + else + misc |=3D PERF_RECORD_MISC_KERNEL; =20 return misc; } diff --git a/arch/csky/kernel/perf_callchain.c b/arch/csky/kernel/perf_call= chain.c index 35318a635a5f..92057de08f4f 100644 --- a/arch/csky/kernel/perf_callchain.c +++ b/arch/csky/kernel/perf_callchain.c @@ -86,13 +86,8 @@ static unsigned long user_backtrace(struct perf_callchai= n_entry_ctx *entry, void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); unsigned long fp =3D 0; =20 - /* C-SKY does not support virtualization. */ - if (guest_cbs && guest_cbs->is_in_guest()) - return; - fp =3D regs->regs[4]; perf_callchain_store(entry, regs->pc); =20 @@ -111,15 +106,8 @@ void perf_callchain_user(struct perf_callchain_entry_c= tx *entry, void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe fr; =20 - /* C-SKY does not support virtualization. */ - if (guest_cbs && guest_cbs->is_in_guest()) { - pr_warn("C-SKY does not support perf in guest mode!"); - return; - } - fr.fp =3D regs->regs[4]; fr.lr =3D regs->lr; walk_stackframe(&fr, entry); diff --git a/arch/nds32/kernel/perf_event_cpu.c b/arch/nds32/kernel/perf_ev= ent_cpu.c index f38791960781..a78a879e7ef1 100644 --- a/arch/nds32/kernel/perf_event_cpu.c +++ b/arch/nds32/kernel/perf_event_cpu.c @@ -1363,7 +1363,6 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); unsigned long fp =3D 0; unsigned long gp =3D 0; unsigned long lp =3D 0; @@ -1372,11 +1371,6 @@ perf_callchain_user(struct perf_callchain_entry_ctx = *entry, =20 leaf_fp =3D 0; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { - /* We don't support guest os callchain now */ - return; - } - perf_callchain_store(entry, regs->ipc); fp =3D regs->fp; gp =3D regs->gp; @@ -1480,13 +1474,8 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe fr; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { - /* We don't support guest os callchain now */ - return; - } fr.fp =3D regs->fp; fr.lp =3D regs->lp; fr.sp =3D regs->sp; @@ -1495,32 +1484,17 @@ perf_callchain_kernel(struct perf_callchain_entry_c= tx *entry, =20 unsigned long perf_instruction_pointer(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - - /* However, NDS32 does not support virtualization */ - if (guest_cbs && guest_cbs->is_in_guest()) - return guest_cbs->get_guest_ip(); - return instruction_pointer(regs); } =20 unsigned long perf_misc_flags(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); int misc =3D 0; =20 - /* However, NDS32 does not support virtualization */ - if (guest_cbs && guest_cbs->is_in_guest()) { - if (guest_cbs->is_user_mode()) - misc |=3D PERF_RECORD_MISC_GUEST_USER; - else - misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; - } else { - if (user_mode(regs)) - misc |=3D PERF_RECORD_MISC_USER; - else - misc |=3D PERF_RECORD_MISC_KERNEL; - } + if (user_mode(regs)) + misc |=3D PERF_RECORD_MISC_USER; + else + misc |=3D PERF_RECORD_MISC_KERNEL; =20 return misc; } diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_ca= llchain.c index 8ecfc4c128bc..1fc075b8f764 100644 --- a/arch/riscv/kernel/perf_callchain.c +++ b/arch/riscv/kernel/perf_callchain.c @@ -56,13 +56,8 @@ static unsigned long user_backtrace(struct perf_callchai= n_entry_ctx *entry, void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); unsigned long fp =3D 0; =20 - /* RISC-V does not support perf in guest mode. */ - if (guest_cbs && guest_cbs->is_in_guest()) - return; - fp =3D regs->s0; perf_callchain_store(entry, regs->epc); =20 @@ -79,13 +74,5 @@ static bool fill_callchain(void *entry, unsigned long pc) void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); 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Wed, 10 Nov 2021 18:07:50 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:27 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-7-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 06/17] perf/core: Rework guest callbacks to prepare for static_call support From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596511776100008 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Like Xu To prepare for using static_calls to optimize perf's guest callbacks, replace ->is_in_guest and ->is_user_mode with a new multiplexed hook ->state, tweak ->handle_intel_pt_intr to play nice with being called when there is no active guest, and drop "guest" from ->get_guest_ip. Return '0' from ->state and ->handle_intel_pt_intr to indicate "not in guest" so that DEFINE_STATIC_CALL_RET0 can be used to define the static calls, i.e. no callback =3D=3D !guest. Suggested-by: Peter Zijlstra (Intel) Originally-by: Peter Zijlstra (Intel) Signed-off-by: Like Xu Signed-off-by: Zhu Lingshan [sean: extracted from static_call patch, fixed get_ip() bug, wrote changelo= g] Signed-off-by: Sean Christopherson Reviewed-by: Boris Ostrovsky Reviewed-by: Paolo Bonzini --- arch/arm64/kernel/perf_callchain.c | 13 +++++----- arch/arm64/kvm/perf.c | 35 +++++++++++--------------- arch/x86/events/core.c | 13 +++++----- arch/x86/events/intel/core.c | 5 +--- arch/x86/include/asm/kvm_host.h | 2 +- arch/x86/kvm/pmu.c | 2 +- arch/x86/kvm/x86.c | 40 ++++++++++++++++-------------- arch/x86/xen/pmu.c | 32 ++++++++++-------------- include/linux/perf_event.h | 10 +++++--- 9 files changed, 73 insertions(+), 79 deletions(-) diff --git a/arch/arm64/kernel/perf_callchain.c b/arch/arm64/kernel/perf_ca= llchain.c index 86d9f2013172..274dc3e11b6d 100644 --- a/arch/arm64/kernel/perf_callchain.c +++ b/arch/arm64/kernel/perf_callchain.c @@ -104,7 +104,7 @@ void perf_callchain_user(struct perf_callchain_entry_ct= x *entry, { struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); =20 - if (guest_cbs && guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->state()) { /* We don't support guest os callchain now */ return; } @@ -152,7 +152,7 @@ void perf_callchain_kernel(struct perf_callchain_entry_= ctx *entry, struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe frame; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->state()) { /* We don't support guest os callchain now */ return; } @@ -165,8 +165,8 @@ unsigned long perf_instruction_pointer(struct pt_regs *= regs) { struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); =20 - if (guest_cbs && guest_cbs->is_in_guest()) - return guest_cbs->get_guest_ip(); + if (guest_cbs && guest_cbs->state()) + return guest_cbs->get_ip(); =20 return instruction_pointer(regs); } @@ -174,10 +174,11 @@ unsigned long perf_instruction_pointer(struct pt_regs= *regs) unsigned long perf_misc_flags(struct pt_regs *regs) { struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + unsigned int guest_state =3D guest_cbs ? guest_cbs->state() : 0; int misc =3D 0; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { - if (guest_cbs->is_user_mode()) + if (guest_state) { + if (guest_state & PERF_GUEST_USER) misc |=3D PERF_RECORD_MISC_GUEST_USER; else misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; diff --git a/arch/arm64/kvm/perf.c b/arch/arm64/kvm/perf.c index a0d660cf889e..dfa9bce8559e 100644 --- a/arch/arm64/kvm/perf.c +++ b/arch/arm64/kvm/perf.c @@ -13,39 +13,34 @@ =20 DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available); =20 -static int kvm_is_in_guest(void) +static unsigned int kvm_guest_state(void) { - return kvm_get_running_vcpu() !=3D NULL; -} + struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); + unsigned int state; =20 -static int kvm_is_user_mode(void) -{ - struct kvm_vcpu *vcpu; - - vcpu =3D kvm_get_running_vcpu(); + if (!vcpu) + return 0; =20 - if (vcpu) - return !vcpu_mode_priv(vcpu); + state =3D PERF_GUEST_ACTIVE; + if (!vcpu_mode_priv(vcpu)) + state |=3D PERF_GUEST_USER; =20 - return 0; + return state; } =20 static unsigned long kvm_get_guest_ip(void) { - struct kvm_vcpu *vcpu; + struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); =20 - vcpu =3D kvm_get_running_vcpu(); + if (WARN_ON_ONCE(!vcpu)) + return 0; =20 - if (vcpu) - return *vcpu_pc(vcpu); - - return 0; + return *vcpu_pc(vcpu); } =20 static struct perf_guest_info_callbacks kvm_guest_cbs =3D { - .is_in_guest =3D kvm_is_in_guest, - .is_user_mode =3D kvm_is_user_mode, - .get_guest_ip =3D kvm_get_guest_ip, + .state =3D kvm_guest_state, + .get_ip =3D kvm_get_guest_ip, }; =20 void kvm_perf_init(void) diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 32cec290d3ad..e29312a1003a 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2772,7 +2772,7 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx= *entry, struct pt_regs *re struct unwind_state state; unsigned long addr; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->state()) { /* TODO: We don't support guest os callchain now */ return; } @@ -2876,7 +2876,7 @@ perf_callchain_user(struct perf_callchain_entry_ctx *= entry, struct pt_regs *regs struct stack_frame frame; const struct stack_frame __user *fp; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { + if (guest_cbs && guest_cbs->state()) { /* TODO: We don't support guest os callchain now */ return; } @@ -2955,8 +2955,8 @@ unsigned long perf_instruction_pointer(struct pt_regs= *regs) { struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); =20 - if (guest_cbs && guest_cbs->is_in_guest()) - return guest_cbs->get_guest_ip(); + if (guest_cbs && guest_cbs->state()) + return guest_cbs->get_ip(); =20 return regs->ip + code_segment_base(regs); } @@ -2964,10 +2964,11 @@ unsigned long perf_instruction_pointer(struct pt_re= gs *regs) unsigned long perf_misc_flags(struct pt_regs *regs) { struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + unsigned int guest_state =3D guest_cbs ? guest_cbs->state() : 0; int misc =3D 0; =20 - if (guest_cbs && guest_cbs->is_in_guest()) { - if (guest_cbs->is_user_mode()) + if (guest_state) { + if (guest_state & PERF_GUEST_USER) misc |=3D PERF_RECORD_MISC_GUEST_USER; else misc |=3D PERF_RECORD_MISC_GUEST_KERNEL; diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index cde29bd5bb53..24adbd6282d4 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -2906,10 +2906,7 @@ static int handle_pmi_common(struct pt_regs *regs, u= 64 status) handled++; =20 guest_cbs =3D perf_get_guest_cbs(); - if (unlikely(guest_cbs && guest_cbs->is_in_guest() && - guest_cbs->handle_intel_pt_intr)) - guest_cbs->handle_intel_pt_intr(); - else + if (likely(!guest_cbs || !guest_cbs->handle_intel_pt_intr())) intel_pt_interrupt(); } =20 diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_hos= t.h index bf0a9ce53750..112ffb355552 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1893,7 +1893,7 @@ int kvm_skip_emulated_instruction(struct kvm_vcpu *vc= pu); int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err); void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu); =20 -int kvm_is_in_guest(void); +unsigned int kvm_guest_state(void); =20 void __user *__x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size); diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 0772bad9165c..5b68d4188de0 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -87,7 +87,7 @@ static void kvm_perf_overflow_intr(struct perf_event *per= f_event, * woken up. So we should wake it, but this is impossible from * NMI context. Do it from irq work instead. */ - if (!kvm_is_in_guest()) + if (!kvm_guest_state()) irq_work_queue(&pmc_to_pmu(pmc)->irq_work); else kvm_make_request(KVM_REQ_PMI, pmc->vcpu); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 021d3f5364b2..ceb09d78277e 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8413,44 +8413,48 @@ static void kvm_timer_init(void) DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu); EXPORT_PER_CPU_SYMBOL_GPL(current_vcpu); =20 -int kvm_is_in_guest(void) +unsigned int kvm_guest_state(void) { - return __this_cpu_read(current_vcpu) !=3D NULL; -} + struct kvm_vcpu *vcpu =3D __this_cpu_read(current_vcpu); + unsigned int state; =20 -static int kvm_is_user_mode(void) -{ - int user_mode =3D 3; + if (!vcpu) + return 0; =20 - if (__this_cpu_read(current_vcpu)) - user_mode =3D static_call(kvm_x86_get_cpl)(__this_cpu_read(current_vcpu)= ); + state =3D PERF_GUEST_ACTIVE; + if (static_call(kvm_x86_get_cpl)(vcpu)) + state |=3D PERF_GUEST_USER; =20 - return user_mode !=3D 0; + return state; } =20 -static unsigned long kvm_get_guest_ip(void) +static unsigned long kvm_guest_get_ip(void) { - unsigned long ip =3D 0; + struct kvm_vcpu *vcpu =3D __this_cpu_read(current_vcpu); =20 - if (__this_cpu_read(current_vcpu)) - ip =3D kvm_rip_read(__this_cpu_read(current_vcpu)); + if (WARN_ON_ONCE(!vcpu)) + return 0; =20 - return ip; + return kvm_rip_read(vcpu); } =20 -static void kvm_handle_intel_pt_intr(void) +static unsigned int kvm_handle_intel_pt_intr(void) { struct kvm_vcpu *vcpu =3D __this_cpu_read(current_vcpu); =20 + /* '0' on failure so that the !PT case can use a RET0 static call. */ + if (!vcpu) + return 0; + kvm_make_request(KVM_REQ_PMI, vcpu); __set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT, (unsigned long *)&vcpu->arch.pmu.global_status); + return 1; } =20 static struct perf_guest_info_callbacks kvm_guest_cbs =3D { - .is_in_guest =3D kvm_is_in_guest, - .is_user_mode =3D kvm_is_user_mode, - .get_guest_ip =3D kvm_get_guest_ip, + .state =3D kvm_guest_state, + .get_ip =3D kvm_guest_get_ip, .handle_intel_pt_intr =3D NULL, }; =20 diff --git a/arch/x86/xen/pmu.c b/arch/x86/xen/pmu.c index e13b0b49fcdf..89dd6b1708b0 100644 --- a/arch/x86/xen/pmu.c +++ b/arch/x86/xen/pmu.c @@ -413,34 +413,29 @@ int pmu_apic_update(uint32_t val) } =20 /* perf callbacks */ -static int xen_is_in_guest(void) +static unsigned int xen_guest_state(void) { const struct xen_pmu_data *xenpmu_data =3D get_xenpmu_data(); + unsigned int state =3D 0; =20 if (!xenpmu_data) { pr_warn_once("%s: pmudata not initialized\n", __func__); - return 0; + return state; } =20 if (!xen_initial_domain() || (xenpmu_data->domain_id >=3D DOMID_SELF)) - return 0; + return state; =20 - return 1; -} + state |=3D PERF_GUEST_ACTIVE; =20 -static int xen_is_user_mode(void) -{ - const struct xen_pmu_data *xenpmu_data =3D get_xenpmu_data(); - - if (!xenpmu_data) { - pr_warn_once("%s: pmudata not initialized\n", __func__); - return 0; + if (xenpmu_data->pmu.pmu_flags & PMU_SAMPLE_PV) { + if (xenpmu_data->pmu.pmu_flags & PMU_SAMPLE_USER) + state |=3D PERF_GUEST_USER; + } else if (xenpmu_data->pmu.r.regs.cpl & 3) { + state |=3D PERF_GUEST_USER; } =20 - if (xenpmu_data->pmu.pmu_flags & PMU_SAMPLE_PV) - return (xenpmu_data->pmu.pmu_flags & PMU_SAMPLE_USER); - else - return !!(xenpmu_data->pmu.r.regs.cpl & 3); + return state; } =20 static unsigned long xen_get_guest_ip(void) @@ -456,9 +451,8 @@ static unsigned long xen_get_guest_ip(void) } =20 static struct perf_guest_info_callbacks xen_guest_cbs =3D { - .is_in_guest =3D xen_is_in_guest, - .is_user_mode =3D xen_is_user_mode, - .get_guest_ip =3D xen_get_guest_ip, + .state =3D xen_guest_state, + .get_ip =3D xen_get_guest_ip, }; =20 /* Convert registers from Xen's format to Linux' */ diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 98c204488496..5e6b346d62a7 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -26,11 +26,13 @@ # include #endif =20 +#define PERF_GUEST_ACTIVE 0x01 +#define PERF_GUEST_USER 0x02 + struct perf_guest_info_callbacks { - int (*is_in_guest)(void); - int (*is_user_mode)(void); - unsigned long (*get_guest_ip)(void); - void (*handle_intel_pt_intr)(void); + unsigned int (*state)(void); + unsigned long (*get_ip)(void); + unsigned int (*handle_intel_pt_intr)(void); }; =20 #ifdef CONFIG_HAVE_HW_BREAKPOINT --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=google.com ARC-Seal: i=1; a=rsa-sha256; t=1636596512; cv=none; d=zohomail.com; s=zohoarc; b=JL8oz05tt8KAZZcCR4nws2zJldZ14MQ893IVGyMH9eQCMCKF0K4aZaReJQaUOQlP+kT7zrAjqwSKXhTLE++RgTSuUpWIWWJ5iphDRppPp5K0PSBvUPBC3oAiKDlcfH9d2YpKhLnLRsduYa3XwoPaQh5kmUp3HJJ7bmXTGDEXYJo= ARC-Message-Signature: i=1; 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Wed, 10 Nov 2021 18:07:52 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:28 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-8-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 07/17] perf: Add wrappers for invoking guest callbacks From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596514205100019 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add helpers for the guest callbacks to prepare for burying the callbacks behind a Kconfig (it's a lot easier to provide a few stubs than to #ifdef piles of code), and also to prepare for converting the callbacks to static_call(). perf_instruction_pointer() in particular will have subtle semantics with static_call(), as the "no callbacks" case will return 0 if the callbacks are unregistered between querying guest state and getting the IP. Implement the change now to avoid a functional change when adding static_call() support, and because the new helper needs to return _something_ in this case. Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/arm64/kernel/perf_callchain.c | 16 +++++----------- arch/x86/events/core.c | 15 +++++---------- arch/x86/events/intel/core.c | 5 +---- include/linux/perf_event.h | 24 ++++++++++++++++++++++++ 4 files changed, 35 insertions(+), 25 deletions(-) diff --git a/arch/arm64/kernel/perf_callchain.c b/arch/arm64/kernel/perf_ca= llchain.c index 274dc3e11b6d..db04a55cee7e 100644 --- a/arch/arm64/kernel/perf_callchain.c +++ b/arch/arm64/kernel/perf_callchain.c @@ -102,9 +102,7 @@ compat_user_backtrace(struct compat_frame_tail __user *= tail, void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - - if (guest_cbs && guest_cbs->state()) { + if (perf_guest_state()) { /* We don't support guest os callchain now */ return; } @@ -149,10 +147,9 @@ static bool callchain_trace(void *data, unsigned long = pc) void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stackframe frame; =20 - if (guest_cbs && guest_cbs->state()) { + if (perf_guest_state()) { /* We don't support guest os callchain now */ return; } @@ -163,18 +160,15 @@ void perf_callchain_kernel(struct perf_callchain_entr= y_ctx *entry, =20 unsigned long perf_instruction_pointer(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - - if (guest_cbs && guest_cbs->state()) - return guest_cbs->get_ip(); + if (perf_guest_state()) + return perf_guest_get_ip(); =20 return instruction_pointer(regs); } =20 unsigned long perf_misc_flags(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - unsigned int guest_state =3D guest_cbs ? guest_cbs->state() : 0; + unsigned int guest_state =3D perf_guest_state(); int misc =3D 0; =20 if (guest_state) { diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index e29312a1003a..620347398027 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2768,11 +2768,10 @@ static bool perf_hw_regs(struct pt_regs *regs) void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_re= gs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct unwind_state state; unsigned long addr; =20 - if (guest_cbs && guest_cbs->state()) { + if (perf_guest_state()) { /* TODO: We don't support guest os callchain now */ return; } @@ -2872,11 +2871,10 @@ perf_callchain_user32(struct pt_regs *regs, struct = perf_callchain_entry_ctx *ent void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs= *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); struct stack_frame frame; const struct stack_frame __user *fp; =20 - if (guest_cbs && guest_cbs->state()) { + if (perf_guest_state()) { /* TODO: We don't support guest os callchain now */ return; } @@ -2953,18 +2951,15 @@ static unsigned long code_segment_base(struct pt_re= gs *regs) =20 unsigned long perf_instruction_pointer(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - - if (guest_cbs && guest_cbs->state()) - return guest_cbs->get_ip(); + if (perf_guest_state()) + return perf_guest_get_ip(); =20 return regs->ip + code_segment_base(regs); } =20 unsigned long perf_misc_flags(struct pt_regs *regs) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - unsigned int guest_state =3D guest_cbs ? guest_cbs->state() : 0; + unsigned int guest_state =3D perf_guest_state(); int misc =3D 0; =20 if (guest_state) { diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index 24adbd6282d4..a5fb247a6a27 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -2837,7 +2837,6 @@ static int handle_pmi_common(struct pt_regs *regs, u6= 4 status) { struct perf_sample_data data; struct cpu_hw_events *cpuc =3D this_cpu_ptr(&cpu_hw_events); - struct perf_guest_info_callbacks *guest_cbs; int bit; int handled =3D 0; u64 intel_ctrl =3D hybrid(cpuc->pmu, intel_ctrl); @@ -2904,9 +2903,7 @@ static int handle_pmi_common(struct pt_regs *regs, u6= 4 status) */ if (__test_and_clear_bit(GLOBAL_STATUS_TRACE_TOPAPMI_BIT, (unsigned long = *)&status)) { handled++; - - guest_cbs =3D perf_get_guest_cbs(); - if (likely(!guest_cbs || !guest_cbs->handle_intel_pt_intr())) + if (!perf_guest_handle_intel_pt_intr()) intel_pt_interrupt(); } =20 diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 5e6b346d62a7..346d5aff5804 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1254,6 +1254,30 @@ static inline struct perf_guest_info_callbacks *perf= _get_guest_cbs(void) */ return rcu_dereference(perf_guest_cbs); } +static inline unsigned int perf_guest_state(void) +{ + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + + return guest_cbs ? guest_cbs->state() : 0; +} +static inline unsigned long perf_guest_get_ip(void) +{ + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + + /* + * Arbitrarily return '0' in the unlikely scenario that the callbacks + * are unregistered between checking guest state and getting the IP. + */ + return guest_cbs ? guest_cbs->get_ip() : 0; +} +static inline unsigned int perf_guest_handle_intel_pt_intr(void) +{ + struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); + + if (guest_cbs && guest_cbs->handle_intel_pt_intr) + return guest_cbs->handle_intel_pt_intr(); + return 0; +} extern void perf_register_guest_info_callbacks(struct perf_guest_info_call= backs *cbs); extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_ca= llbacks *cbs); =20 --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=google.com ARC-Seal: i=1; a=rsa-sha256; t=1636596512; cv=none; d=zohomail.com; s=zohoarc; b=gRRcA5cYE4V4Y1PI/A9zcX56db9JX8XJkePd95/EvsLm0+xKViGJX55bLRsup/zidB6CVu/89nsm0ewXXhQi+T4SadCpD0Rltu0iLWYL7DwN/lo4juNpQ7EMIWqHcqbm/ge+CTEuCwjNXvVQhpOBzg9U87TAtynEl+qDhnFEYa4= ARC-Message-Signature: i=1; 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Wed, 10 Nov 2021 18:07:54 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:29 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-9-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 08/17] perf: Force architectures to opt-in to guest callbacks From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596514065100017 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce GUEST_PERF_EVENTS and require architectures to select it to allow registering and using guest callbacks in perf. This will hopefully make it more difficult for new architectures to add useless "support" for guest callbacks, e.g. via copy+paste. Stubbing out the helpers has the happy bonus of avoiding a load of perf_guest_cbs when GUEST_PERF_EVENTS=3Dn on arm64/x86. Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/arm64/kvm/Kconfig | 1 + arch/x86/kvm/Kconfig | 1 + arch/x86/xen/Kconfig | 1 + include/linux/perf_event.h | 6 ++++++ init/Kconfig | 4 ++++ kernel/events/core.c | 2 ++ 6 files changed, 15 insertions(+) diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 8ffcbe29395e..e9761d84f982 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -39,6 +39,7 @@ menuconfig KVM select HAVE_KVM_IRQ_BYPASS select HAVE_KVM_VCPU_RUN_PID_CHANGE select SCHED_INFO + select GUEST_PERF_EVENTS if PERF_EVENTS help Support hosting virtualized guest machines. =20 diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 619186138176..47bdbe705a76 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -36,6 +36,7 @@ config KVM select KVM_MMIO select SCHED_INFO select PERF_EVENTS + select GUEST_PERF_EVENTS select HAVE_KVM_MSI select HAVE_KVM_CPU_RELAX_INTERCEPT select HAVE_KVM_NO_POLL diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig index 6bcd3d8ca6ac..85246dd9faa1 100644 --- a/arch/x86/xen/Kconfig +++ b/arch/x86/xen/Kconfig @@ -23,6 +23,7 @@ config XEN_PV select PARAVIRT_XXL select XEN_HAVE_PVMMU select XEN_HAVE_VPMU + select GUEST_PERF_EVENTS help Support running as a Xen PV guest. =20 diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 346d5aff5804..ea47ef616ee0 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1242,6 +1242,7 @@ extern void perf_event_bpf_event(struct bpf_prog *pro= g, enum perf_bpf_event_type type, u16 flags); =20 +#ifdef CONFIG_GUEST_PERF_EVENTS extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs; static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void) { @@ -1280,6 +1281,11 @@ static inline unsigned int perf_guest_handle_intel_p= t_intr(void) } extern void perf_register_guest_info_callbacks(struct perf_guest_info_call= backs *cbs); extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_ca= llbacks *cbs); +#else +static inline unsigned int perf_guest_state(void) { return 0; } +static inline unsigned long perf_guest_get_ip(void) { return 0; } +static inline unsigned int perf_guest_handle_intel_pt_intr(void) { return = 0; } +#endif /* CONFIG_GUEST_PERF_EVENTS */ =20 extern void perf_event_exec(void); extern void perf_event_comm(struct task_struct *tsk, bool exec); diff --git a/init/Kconfig b/init/Kconfig index 21b1f4870c80..6bc5c56d669b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1799,6 +1799,10 @@ config HAVE_PERF_EVENTS help See tools/perf/design.txt for details. =20 +config GUEST_PERF_EVENTS + bool + depends on HAVE_PERF_EVENTS + config PERF_USE_VMALLOC bool help diff --git a/kernel/events/core.c b/kernel/events/core.c index eb6b9cfd0054..1c8d341ecc77 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6521,6 +6521,7 @@ static void perf_pending_event(struct irq_work *entry) perf_swevent_put_recursion_context(rctx); } =20 +#ifdef CONFIG_GUEST_PERF_EVENTS struct perf_guest_info_callbacks __rcu *perf_guest_cbs; =20 void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *= cbs) @@ -6541,6 +6542,7 @@ void perf_unregister_guest_info_callbacks(struct perf= _guest_info_callbacks *cbs) synchronize_rcu(); } EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); +#endif =20 static void perf_output_sample_regs(struct perf_output_handle *handle, --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=google.com ARC-Seal: i=1; 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Wed, 10 Nov 2021 18:07:55 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:30 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-10-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 09/17] perf/core: Use static_call to optimize perf_guest_info_callbacks From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596516271100023 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use static_call to optimize perf's guest callbacks on arm64 and x86, which are now the only architectures that define the callbacks. Use DEFINE_STATIC_CALL_RET0 as the default/NULL for all guest callbacks, as the callback semantics are that a return value '0' means "not in guest". static_call obviously avoids the overhead of CONFIG_RETPOLINE=3Dy, but is also advantageous versus other solutions, e.g. per-cpu callbacks, in that a per-cpu memory load is not needed to detect the !guest case. Based on code from Peter and Like. Suggested-by: Peter Zijlstra (Intel) Cc: Like Xu Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- include/linux/perf_event.h | 34 ++++++++-------------------------- kernel/events/core.c | 15 +++++++++++++++ 2 files changed, 23 insertions(+), 26 deletions(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index ea47ef616ee0..0ac7d867ca0c 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1244,40 +1244,22 @@ extern void perf_event_bpf_event(struct bpf_prog *p= rog, =20 #ifdef CONFIG_GUEST_PERF_EVENTS extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs; -static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void) -{ - /* - * Callbacks are RCU-protected and must be READ_ONCE to avoid reloading - * the callbacks between a !NULL check and dereferences, to ensure - * pending stores/changes to the callback pointers are visible before a - * non-NULL perf_guest_cbs is visible to readers, and to prevent a - * module from unloading callbacks while readers are active. - */ - return rcu_dereference(perf_guest_cbs); -} + +DECLARE_STATIC_CALL(__perf_guest_state, *perf_guest_cbs->state); +DECLARE_STATIC_CALL(__perf_guest_get_ip, *perf_guest_cbs->get_ip); +DECLARE_STATIC_CALL(__perf_guest_handle_intel_pt_intr, *perf_guest_cbs->ha= ndle_intel_pt_intr); + static inline unsigned int perf_guest_state(void) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - - return guest_cbs ? guest_cbs->state() : 0; + return static_call(__perf_guest_state)(); } static inline unsigned long perf_guest_get_ip(void) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - - /* - * Arbitrarily return '0' in the unlikely scenario that the callbacks - * are unregistered between checking guest state and getting the IP. - */ - return guest_cbs ? guest_cbs->get_ip() : 0; + return static_call(__perf_guest_get_ip)(); } static inline unsigned int perf_guest_handle_intel_pt_intr(void) { - struct perf_guest_info_callbacks *guest_cbs =3D perf_get_guest_cbs(); - - if (guest_cbs && guest_cbs->handle_intel_pt_intr) - return guest_cbs->handle_intel_pt_intr(); - return 0; + return static_call(__perf_guest_handle_intel_pt_intr)(); } extern void perf_register_guest_info_callbacks(struct perf_guest_info_call= backs *cbs); extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_ca= llbacks *cbs); diff --git a/kernel/events/core.c b/kernel/events/core.c index 1c8d341ecc77..b4fd928e4ff8 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6524,12 +6524,23 @@ static void perf_pending_event(struct irq_work *ent= ry) #ifdef CONFIG_GUEST_PERF_EVENTS struct perf_guest_info_callbacks __rcu *perf_guest_cbs; =20 +DEFINE_STATIC_CALL_RET0(__perf_guest_state, *perf_guest_cbs->state); +DEFINE_STATIC_CALL_RET0(__perf_guest_get_ip, *perf_guest_cbs->get_ip); +DEFINE_STATIC_CALL_RET0(__perf_guest_handle_intel_pt_intr, *perf_guest_cbs= ->handle_intel_pt_intr); + void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *= cbs) { if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs))) return; =20 rcu_assign_pointer(perf_guest_cbs, cbs); + static_call_update(__perf_guest_state, cbs->state); + static_call_update(__perf_guest_get_ip, cbs->get_ip); + + /* Implementing ->handle_intel_pt_intr is optional. */ + if (cbs->handle_intel_pt_intr) + static_call_update(__perf_guest_handle_intel_pt_intr, + cbs->handle_intel_pt_intr); } EXPORT_SYMBOL_GPL(perf_register_guest_info_callbacks); =20 @@ -6539,6 +6550,10 @@ void perf_unregister_guest_info_callbacks(struct per= f_guest_info_callbacks *cbs) return; =20 rcu_assign_pointer(perf_guest_cbs, NULL); + static_call_update(__perf_guest_state, (void *)&__static_call_return0); + static_call_update(__perf_guest_get_ip, (void *)&__static_call_return0); + static_call_update(__perf_guest_handle_intel_pt_intr, + (void *)&__static_call_return0); synchronize_rcu(); } EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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Wed, 10 Nov 2021 18:07:57 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:31 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-11-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 10/17] KVM: x86: Drop current_vcpu for kvm_running_vcpu + kvm_arch_vcpu variable From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596516312100024 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use the generic kvm_running_vcpu plus a new 'handling_intr_from_guest' variable in kvm_arch_vcpu instead of the semi-redundant current_vcpu. kvm_before/after_interrupt() must be called while the vCPU is loaded, (which protects against preemption), thus kvm_running_vcpu is guaranteed to be non-NULL when handling_intr_from_guest is non-zero. Switching to kvm_get_running_vcpu() will allows moving KVM's perf callbacks to generic code, and the new flag will be used in a future patch to more precisely identify the "NMI from guest" case. Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/x86/include/asm/kvm_host.h | 3 +-- arch/x86/kvm/pmu.c | 2 +- arch/x86/kvm/x86.c | 21 ++++++++++++--------- arch/x86/kvm/x86.h | 10 ++++++---- 4 files changed, 20 insertions(+), 16 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_hos= t.h index 112ffb355552..812c08e797fe 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -773,6 +773,7 @@ struct kvm_vcpu_arch { unsigned nmi_pending; /* NMI queued after currently running handler */ bool nmi_injected; /* Trying to inject an NMI this entry */ bool smi_pending; /* SMI queued after currently running handler */ + u8 handling_intr_from_guest; =20 struct kvm_mtrr mtrr_state; u64 pat; @@ -1893,8 +1894,6 @@ int kvm_skip_emulated_instruction(struct kvm_vcpu *vc= pu); int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err); void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu); =20 -unsigned int kvm_guest_state(void); - void __user *__x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size); bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu); diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 5b68d4188de0..eef48258e50f 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -87,7 +87,7 @@ static void kvm_perf_overflow_intr(struct perf_event *per= f_event, * woken up. So we should wake it, but this is impossible from * NMI context. Do it from irq work instead. */ - if (!kvm_guest_state()) + if (!kvm_handling_nmi_from_guest(pmc->vcpu)) irq_work_queue(&pmc_to_pmu(pmc)->irq_work); else kvm_make_request(KVM_REQ_PMI, pmc->vcpu); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ceb09d78277e..c8ef49385c99 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8410,15 +8410,17 @@ static void kvm_timer_init(void) kvmclock_cpu_online, kvmclock_cpu_down_prep); } =20 -DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu); -EXPORT_PER_CPU_SYMBOL_GPL(current_vcpu); +static inline bool kvm_pmi_in_guest(struct kvm_vcpu *vcpu) +{ + return vcpu && vcpu->arch.handling_intr_from_guest; +} =20 -unsigned int kvm_guest_state(void) +static unsigned int kvm_guest_state(void) { - struct kvm_vcpu *vcpu =3D __this_cpu_read(current_vcpu); + struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); unsigned int state; =20 - if (!vcpu) + if (!kvm_pmi_in_guest(vcpu)) return 0; =20 state =3D PERF_GUEST_ACTIVE; @@ -8430,9 +8432,10 @@ unsigned int kvm_guest_state(void) =20 static unsigned long kvm_guest_get_ip(void) { - struct kvm_vcpu *vcpu =3D __this_cpu_read(current_vcpu); + struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); =20 - if (WARN_ON_ONCE(!vcpu)) + /* Retrieving the IP must be guarded by a call to kvm_guest_state(). */ + if (WARN_ON_ONCE(!kvm_pmi_in_guest(vcpu))) return 0; =20 return kvm_rip_read(vcpu); @@ -8440,10 +8443,10 @@ static unsigned long kvm_guest_get_ip(void) =20 static unsigned int kvm_handle_intel_pt_intr(void) { - struct kvm_vcpu *vcpu =3D __this_cpu_read(current_vcpu); + struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); =20 /* '0' on failure so that the !PT case can use a RET0 static call. */ - if (!vcpu) + if (!kvm_pmi_in_guest(vcpu)) return 0; =20 kvm_make_request(KVM_REQ_PMI, vcpu); diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index ea264c4502e4..d070043fd2e8 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -385,18 +385,20 @@ static inline bool kvm_cstate_in_guest(struct kvm *kv= m) return kvm->arch.cstate_in_guest; } =20 -DECLARE_PER_CPU(struct kvm_vcpu *, current_vcpu); - static inline void kvm_before_interrupt(struct kvm_vcpu *vcpu) { - __this_cpu_write(current_vcpu, vcpu); + WRITE_ONCE(vcpu->arch.handling_intr_from_guest, 1); } =20 static inline void kvm_after_interrupt(struct kvm_vcpu *vcpu) { - __this_cpu_write(current_vcpu, NULL); + WRITE_ONCE(vcpu->arch.handling_intr_from_guest, 0); } =20 +static inline bool kvm_handling_nmi_from_guest(struct kvm_vcpu *vcpu) +{ + return !!vcpu->arch.handling_intr_from_guest; +} =20 static inline bool kvm_pat_valid(u64 data) { --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=google.com ARC-Seal: i=1; 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Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596518317100027 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Differentiate between IRQ and NMI for KVM's PMC overflow callback, which was originally invoked in response to an NMI that arrived while the guest was running, but was inadvertantly changed to fire on IRQs as well when support for perf without PMU/NMI was added to KVM. In practice, this should be a nop as the PMC overflow callback shouldn't be reached, but it's a cheap and easy fix that also better documents the situation. Note, this also doesn't completely prevent false positives if perf somehow ends up calling into KVM, e.g. an NMI can arrive in host after KVM sets its flag. Fixes: dd60d217062f ("KVM: x86: Fix perf timer mode IP reporting") Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/x86/kvm/svm/svm.c | 2 +- arch/x86/kvm/vmx/vmx.c | 4 +++- arch/x86/kvm/x86.c | 2 +- arch/x86/kvm/x86.h | 13 ++++++++++--- 4 files changed, 15 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index b36ca4e476c2..df6a3e0bdcde 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3936,7 +3936,7 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_= vcpu *vcpu) } =20 if (unlikely(svm->vmcb->control.exit_code =3D=3D SVM_EXIT_NMI)) - kvm_before_interrupt(vcpu); + kvm_before_interrupt(vcpu, KVM_HANDLING_NMI); =20 kvm_load_host_xsave_state(vcpu); stgi(); diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 0927d07b2efb..36098eb9a7f9 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6371,7 +6371,9 @@ void vmx_do_interrupt_nmi_irqoff(unsigned long entry); static void handle_interrupt_nmi_irqoff(struct kvm_vcpu *vcpu, unsigned long entry) { - kvm_before_interrupt(vcpu); + bool is_nmi =3D entry =3D=3D (unsigned long)asm_exc_nmi_noist; + + kvm_before_interrupt(vcpu, is_nmi ? KVM_HANDLING_NMI : KVM_HANDLING_IRQ); vmx_do_interrupt_nmi_irqoff(entry); kvm_after_interrupt(vcpu); } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c8ef49385c99..e9e1a4bb1d00 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9837,7 +9837,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) * interrupts on processors that implement an interrupt shadow, the * stat.exits increment will do nicely. */ - kvm_before_interrupt(vcpu); + kvm_before_interrupt(vcpu, KVM_HANDLING_IRQ); local_irq_enable(); ++vcpu->stat.exits; local_irq_disable(); diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index d070043fd2e8..f8d2c58feadc 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -385,9 +385,16 @@ static inline bool kvm_cstate_in_guest(struct kvm *kvm) return kvm->arch.cstate_in_guest; } =20 -static inline void kvm_before_interrupt(struct kvm_vcpu *vcpu) +enum kvm_intr_type { + /* Values are arbitrary, but must be non-zero. */ + KVM_HANDLING_IRQ =3D 1, + KVM_HANDLING_NMI, +}; + +static inline void kvm_before_interrupt(struct kvm_vcpu *vcpu, + enum kvm_intr_type intr) { - WRITE_ONCE(vcpu->arch.handling_intr_from_guest, 1); + WRITE_ONCE(vcpu->arch.handling_intr_from_guest, (u8)intr); } =20 static inline void kvm_after_interrupt(struct kvm_vcpu *vcpu) @@ -397,7 +404,7 @@ static inline void kvm_after_interrupt(struct kvm_vcpu = *vcpu) =20 static inline bool kvm_handling_nmi_from_guest(struct kvm_vcpu *vcpu) { - return !!vcpu->arch.handling_intr_from_guest; + return vcpu->arch.handling_intr_from_guest =3D=3D KVM_HANDLING_NMI; } =20 static inline bool kvm_pat_valid(u64 data) --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; 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Wed, 10 Nov 2021 18:08:00 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:33 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-13-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 12/17] KVM: Move x86's perf guest info callbacks to generic KVM From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596518354100028 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Move x86's perf guest callbacks into common KVM, as they are semantically identical to arm64's callbacks (the only other such KVM callbacks). arm64 will convert to the common versions in a future patch. Implement the necessary arm64 arch hooks now to avoid having to provide stubs or a temporary #define (from x86) to avoid arm64 compilation errors when CONFIG_GUEST_PERF_EVENTS=3Dy. Acked-by: Marc Zyngier Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/arm64/include/asm/kvm_host.h | 10 ++++++ arch/arm64/kvm/arm.c | 5 +++ arch/x86/include/asm/kvm_host.h | 3 ++ arch/x86/kvm/x86.c | 53 +++++++------------------------ include/linux/kvm_host.h | 10 ++++++ virt/kvm/kvm_main.c | 44 +++++++++++++++++++++++++ 6 files changed, 83 insertions(+), 42 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm= _host.h index 5a76d9a76fd9..72e2afe6e8e3 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -678,6 +678,16 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fa= ult_ipa); void kvm_perf_init(void); void kvm_perf_teardown(void); =20 +/* + * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf e= vent, + * arrived in guest context. For arm64, any event that arrives while a vC= PU is + * loaded is considered to be "in guest". + */ +static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) +{ + return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu; +} + long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu); gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu); void kvm_update_stolen_time(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index f5490afe1ebf..93c952375f3b 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -496,6 +496,11 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) return vcpu_mode_priv(vcpu); } =20 +unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu) +{ + return *vcpu_pc(vcpu); +} + /* Just ensure a guest exit from a particular CPU */ static void exit_vm_noop(void *info) { diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_hos= t.h index 812c08e797fe..ec16f645cb8c 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1565,6 +1565,9 @@ static inline int kvm_arch_flush_remote_tlb(struct kv= m *kvm) return -ENOTSUPP; } =20 +#define kvm_arch_pmi_in_guest(vcpu) \ + ((vcpu) && (vcpu)->arch.handling_intr_from_guest) + int kvm_mmu_module_init(void); void kvm_mmu_module_exit(void); =20 diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e9e1a4bb1d00..bafd2e78ad04 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8410,43 +8410,12 @@ static void kvm_timer_init(void) kvmclock_cpu_online, kvmclock_cpu_down_prep); } =20 -static inline bool kvm_pmi_in_guest(struct kvm_vcpu *vcpu) -{ - return vcpu && vcpu->arch.handling_intr_from_guest; -} - -static unsigned int kvm_guest_state(void) -{ - struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); - unsigned int state; - - if (!kvm_pmi_in_guest(vcpu)) - return 0; - - state =3D PERF_GUEST_ACTIVE; - if (static_call(kvm_x86_get_cpl)(vcpu)) - state |=3D PERF_GUEST_USER; - - return state; -} - -static unsigned long kvm_guest_get_ip(void) -{ - struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); - - /* Retrieving the IP must be guarded by a call to kvm_guest_state(). */ - if (WARN_ON_ONCE(!kvm_pmi_in_guest(vcpu))) - return 0; - - return kvm_rip_read(vcpu); -} - static unsigned int kvm_handle_intel_pt_intr(void) { struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); =20 /* '0' on failure so that the !PT case can use a RET0 static call. */ - if (!kvm_pmi_in_guest(vcpu)) + if (!kvm_arch_pmi_in_guest(vcpu)) return 0; =20 kvm_make_request(KVM_REQ_PMI, vcpu); @@ -8455,12 +8424,6 @@ static unsigned int kvm_handle_intel_pt_intr(void) return 1; } =20 -static struct perf_guest_info_callbacks kvm_guest_cbs =3D { - .state =3D kvm_guest_state, - .get_ip =3D kvm_guest_get_ip, - .handle_intel_pt_intr =3D NULL, -}; - #ifdef CONFIG_X86_64 static void pvclock_gtod_update_fn(struct work_struct *work) { @@ -11153,9 +11116,11 @@ int kvm_arch_hardware_setup(void *opaque) memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); kvm_ops_static_call_update(); =20 + /* Temporary ugliness. */ if (ops->intel_pt_intr_in_guest && ops->intel_pt_intr_in_guest()) - kvm_guest_cbs.handle_intel_pt_intr =3D kvm_handle_intel_pt_intr; - perf_register_guest_info_callbacks(&kvm_guest_cbs); + kvm_register_perf_callbacks(kvm_handle_intel_pt_intr); + else + kvm_register_perf_callbacks(NULL); =20 if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) supported_xss =3D 0; @@ -11184,8 +11149,7 @@ int kvm_arch_hardware_setup(void *opaque) =20 void kvm_arch_hardware_unsetup(void) { - perf_unregister_guest_info_callbacks(&kvm_guest_cbs); - kvm_guest_cbs.handle_intel_pt_intr =3D NULL; + kvm_unregister_perf_callbacks(); =20 static_call(kvm_x86_hardware_unsetup)(); } @@ -11776,6 +11740,11 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) return vcpu->arch.preempted_in_kernel; } =20 +unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu) +{ + return kvm_rip_read(vcpu); +} + int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) { return kvm_vcpu_exiting_guest_mode(vcpu) =3D=3D IN_GUEST_MODE; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 60a35d9fe259..da843044e0c1 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1162,6 +1162,16 @@ static inline bool kvm_arch_intc_initialized(struct = kvm *kvm) } #endif =20 +#ifdef CONFIG_GUEST_PERF_EVENTS +unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu); + +void kvm_register_perf_callbacks(unsigned int (*pt_intr_handler)(void)); +void kvm_unregister_perf_callbacks(void); +#else +static inline void kvm_register_perf_callbacks(void *ign) {} +static inline void kvm_unregister_perf_callbacks(void) {} +#endif /* CONFIG_GUEST_PERF_EVENTS */ + int kvm_arch_init_vm(struct kvm *kvm, unsigned long type); void kvm_arch_destroy_vm(struct kvm *kvm); void kvm_arch_sync_events(struct kvm *kvm); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 3f6d450355f0..75d32fc031b5 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5479,6 +5479,50 @@ struct kvm_vcpu * __percpu *kvm_get_running_vcpus(vo= id) return &kvm_running_vcpu; } =20 +#ifdef CONFIG_GUEST_PERF_EVENTS +static unsigned int kvm_guest_state(void) +{ + struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); + unsigned int state; + + if (!kvm_arch_pmi_in_guest(vcpu)) + return 0; + + state =3D PERF_GUEST_ACTIVE; + if (!kvm_arch_vcpu_in_kernel(vcpu)) + state |=3D PERF_GUEST_USER; + + return state; +} + +static unsigned long kvm_guest_get_ip(void) +{ + struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); + + /* Retrieving the IP must be guarded by a call to kvm_guest_state(). */ + if (WARN_ON_ONCE(!kvm_arch_pmi_in_guest(vcpu))) + return 0; + + return kvm_arch_vcpu_get_ip(vcpu); +} + +static struct perf_guest_info_callbacks kvm_guest_cbs =3D { + .state =3D kvm_guest_state, + .get_ip =3D kvm_guest_get_ip, + .handle_intel_pt_intr =3D NULL, +}; + +void kvm_register_perf_callbacks(unsigned int (*pt_intr_handler)(void)) +{ + kvm_guest_cbs.handle_intel_pt_intr =3D pt_intr_handler; + perf_register_guest_info_callbacks(&kvm_guest_cbs); +} +void kvm_unregister_perf_callbacks(void) +{ + perf_unregister_guest_info_callbacks(&kvm_guest_cbs); +} +#endif + struct kvm_cpu_compat_check { void *opaque; int *ret; --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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Wed, 10 Nov 2021 18:08:01 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:34 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-14-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 13/17] KVM: x86: Move Intel Processor Trace interrupt handler to vmx.c From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636597046461100005 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Now that all state needed for VMX's PT interrupt handler is exposed to vmx.c (specifically the currently running vCPU), move the handler into vmx.c where it belongs. Signed-off-by: Sean Christopherson --- arch/x86/include/asm/kvm_host.h | 2 +- arch/x86/kvm/vmx/vmx.c | 22 +++++++++++++++++++++- arch/x86/kvm/x86.c | 20 +------------------- 3 files changed, 23 insertions(+), 21 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_hos= t.h index ec16f645cb8c..621bedff0aa5 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1515,7 +1515,7 @@ struct kvm_x86_init_ops { int (*disabled_by_bios)(void); int (*check_processor_compatibility)(void); int (*hardware_setup)(void); - bool (*intel_pt_intr_in_guest)(void); + unsigned int (*handle_intel_pt_intr)(void); =20 struct kvm_x86_ops *runtime_ops; }; diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 36098eb9a7f9..7cb7f261f7dc 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7708,6 +7708,20 @@ static struct kvm_x86_ops vmx_x86_ops __initdata =3D= { .vcpu_deliver_sipi_vector =3D kvm_vcpu_deliver_sipi_vector, }; =20 +static unsigned int vmx_handle_intel_pt_intr(void) +{ + struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); + + /* '0' on failure so that the !PT case can use a RET0 static call. */ + if (!kvm_arch_pmi_in_guest(vcpu)) + return 0; + + kvm_make_request(KVM_REQ_PMI, vcpu); + __set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT, + (unsigned long *)&vcpu->arch.pmu.global_status); + return 1; +} + static __init void vmx_setup_user_return_msrs(void) { =20 @@ -7734,6 +7748,8 @@ static __init void vmx_setup_user_return_msrs(void) kvm_add_user_return_msr(vmx_uret_msrs_list[i]); } =20 +static struct kvm_x86_init_ops vmx_init_ops __initdata; + static __init int hardware_setup(void) { unsigned long host_bndcfgs; @@ -7892,6 +7908,10 @@ static __init int hardware_setup(void) return -EINVAL; if (!enable_ept || !cpu_has_vmx_intel_pt()) pt_mode =3D PT_MODE_SYSTEM; + if (pt_mode =3D=3D PT_MODE_HOST_GUEST) + vmx_init_ops.handle_intel_pt_intr =3D vmx_handle_intel_pt_intr; + else + vmx_init_ops.handle_intel_pt_intr =3D NULL; =20 setup_default_sgx_lepubkeyhash(); =20 @@ -7920,7 +7940,7 @@ static struct kvm_x86_init_ops vmx_init_ops __initdat= a =3D { .disabled_by_bios =3D vmx_disabled_by_bios, .check_processor_compatibility =3D vmx_check_processor_compat, .hardware_setup =3D hardware_setup, - .intel_pt_intr_in_guest =3D vmx_pt_mode_is_host_guest, + .handle_intel_pt_intr =3D NULL, =20 .runtime_ops =3D &vmx_x86_ops, }; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index bafd2e78ad04..a4d25d0587e6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8410,20 +8410,6 @@ static void kvm_timer_init(void) kvmclock_cpu_online, kvmclock_cpu_down_prep); } =20 -static unsigned int kvm_handle_intel_pt_intr(void) -{ - struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); - - /* '0' on failure so that the !PT case can use a RET0 static call. */ - if (!kvm_arch_pmi_in_guest(vcpu)) - return 0; - - kvm_make_request(KVM_REQ_PMI, vcpu); - __set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT, - (unsigned long *)&vcpu->arch.pmu.global_status); - return 1; -} - #ifdef CONFIG_X86_64 static void pvclock_gtod_update_fn(struct work_struct *work) { @@ -11116,11 +11102,7 @@ int kvm_arch_hardware_setup(void *opaque) memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); kvm_ops_static_call_update(); =20 - /* Temporary ugliness. */ - if (ops->intel_pt_intr_in_guest && ops->intel_pt_intr_in_guest()) - kvm_register_perf_callbacks(kvm_handle_intel_pt_intr); - else - kvm_register_perf_callbacks(NULL); + kvm_register_perf_callbacks(ops->handle_intel_pt_intr); =20 if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) supported_xss =3D 0; --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; 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Wed, 10 Nov 2021 18:08:03 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:35 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-15-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 14/17] KVM: arm64: Convert to the generic perf callbacks From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636596524469100003 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Drop arm64's version of the callbacks in favor of the callbacks provided by generic KVM, which are semantically identical. Reviewed-by: Marc Zyngier Signed-off-by: Sean Christopherson --- arch/arm64/kvm/perf.c | 34 ++-------------------------------- 1 file changed, 2 insertions(+), 32 deletions(-) diff --git a/arch/arm64/kvm/perf.c b/arch/arm64/kvm/perf.c index dfa9bce8559e..374c496a3f1d 100644 --- a/arch/arm64/kvm/perf.c +++ b/arch/arm64/kvm/perf.c @@ -13,42 +13,12 @@ =20 DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available); =20 -static unsigned int kvm_guest_state(void) -{ - struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); - unsigned int state; - - if (!vcpu) - return 0; - - state =3D PERF_GUEST_ACTIVE; - if (!vcpu_mode_priv(vcpu)) - state |=3D PERF_GUEST_USER; - - return state; -} - -static unsigned long kvm_get_guest_ip(void) -{ - struct kvm_vcpu *vcpu =3D kvm_get_running_vcpu(); - - if (WARN_ON_ONCE(!vcpu)) - return 0; - - return *vcpu_pc(vcpu); -} - -static struct perf_guest_info_callbacks kvm_guest_cbs =3D { - .state =3D kvm_guest_state, - .get_ip =3D kvm_get_guest_ip, -}; - void kvm_perf_init(void) { - perf_register_guest_info_callbacks(&kvm_guest_cbs); + kvm_register_perf_callbacks(NULL); } =20 void kvm_perf_teardown(void) { - perf_unregister_guest_info_callbacks(&kvm_guest_cbs); + kvm_unregister_perf_callbacks(); } --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=google.com ARC-Seal: i=1; a=rsa-sha256; t=1636597044; cv=none; d=zohomail.com; s=zohoarc; b=U7NZYdqQ1nVl7E7nvhyttpqLlbFYhPhKTbNgBi0gpBaDhXc3wpnC+f0UxjqniYLnxezGDxEj+RB/NNgQrCfv8bKeN95k3vRAtwlH8nGrxllC9epj9YZmoVA3dIIudUtxVwtlzI/FF1adpgIThvAHL+WwcBhw5Ja+JQBg0WgmS28= ARC-Message-Signature: i=1; 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Wed, 10 Nov 2021 18:08:05 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:36 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-16-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 15/17] KVM: arm64: Hide kvm_arm_pmu_available behind CONFIG_HW_PERF_EVENTS=y From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636597044448100002 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Move the definition of kvm_arm_pmu_available to pmu-emul.c and, out of "necessity", hide it behind CONFIG_HW_PERF_EVENTS. Provide a stub for the key's wrapper, kvm_arm_support_pmu_v3(). Moving the key's definition out of perf.c will allow a future commit to delete perf.c entirely. Signed-off-by: Sean Christopherson Reviewed-by: Marc Zyngier --- arch/arm64/kernel/image-vars.h | 2 ++ arch/arm64/kvm/perf.c | 2 -- arch/arm64/kvm/pmu-emul.c | 2 ++ include/kvm/arm_pmu.h | 19 ++++++++++++------- 4 files changed, 16 insertions(+), 9 deletions(-) diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index c96a9a0043bf..7eaf1f7c4168 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -102,7 +102,9 @@ KVM_NVHE_ALIAS(__stop___kvm_ex_table); KVM_NVHE_ALIAS(kvm_arm_hyp_percpu_base); =20 /* PMU available static key */ +#ifdef CONFIG_HW_PERF_EVENTS KVM_NVHE_ALIAS(kvm_arm_pmu_available); +#endif =20 /* Position-independent library routines */ KVM_NVHE_ALIAS_HYP(clear_page, __pi_clear_page); diff --git a/arch/arm64/kvm/perf.c b/arch/arm64/kvm/perf.c index 374c496a3f1d..52cfab253c65 100644 --- a/arch/arm64/kvm/perf.c +++ b/arch/arm64/kvm/perf.c @@ -11,8 +11,6 @@ =20 #include =20 -DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available); - void kvm_perf_init(void) { kvm_register_perf_callbacks(NULL); diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index a5e4bbf5e68f..3308ceefa129 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -14,6 +14,8 @@ #include #include =20 +DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available); + static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_id= x); static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_i= dx); static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pm= c); diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h index 90f21898aad8..f9ed4c171d7b 100644 --- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -13,13 +13,6 @@ #define ARMV8_PMU_CYCLE_IDX (ARMV8_PMU_MAX_COUNTERS - 1) #define ARMV8_PMU_MAX_COUNTER_PAIRS ((ARMV8_PMU_MAX_COUNTERS + 1) >> 1) =20 -DECLARE_STATIC_KEY_FALSE(kvm_arm_pmu_available); - -static __always_inline bool kvm_arm_support_pmu_v3(void) -{ - return static_branch_likely(&kvm_arm_pmu_available); -} - #ifdef CONFIG_HW_PERF_EVENTS =20 struct kvm_pmc { @@ -36,6 +29,13 @@ struct kvm_pmu { struct irq_work overflow_work; }; =20 +DECLARE_STATIC_KEY_FALSE(kvm_arm_pmu_available); + +static __always_inline bool kvm_arm_support_pmu_v3(void) +{ + return static_branch_likely(&kvm_arm_pmu_available); +} + #define kvm_arm_pmu_irq_initialized(v) ((v)->arch.pmu.irq_num >=3D VGIC_NR= _SGIS) u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx); void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 = val); @@ -65,6 +65,11 @@ int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu); struct kvm_pmu { }; =20 +static inline bool kvm_arm_support_pmu_v3(void) +{ + return false; +} + #define kvm_arm_pmu_irq_initialized(v) (false) static inline u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx) --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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Wed, 10 Nov 2021 18:08:06 -0800 (PST) Reply-To: Sean Christopherson Date: Thu, 11 Nov 2021 02:07:37 +0000 In-Reply-To: <20211111020738.2512932-1-seanjc@google.com> Message-Id: <20211111020738.2512932-17-seanjc@google.com> Mime-Version: 1.0 References: <20211111020738.2512932-1-seanjc@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v4 16/17] KVM: arm64: Drop perf.c and fold its tiny bits of code into arm.c From: Sean Christopherson To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Will Deacon , Mark Rutland , Russell King , Marc Zyngier , Catalin Marinas , Guo Ren , Nick Hu , Greentime Hu , Vincent Chen , Paul Walmsley , Palmer Dabbelt , Albert Ou , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , Boris Ostrovsky , Juergen Gross Cc: Alexander Shishkin , Jiri Olsa , Namhyung Kim , James Morse , Alexandru Elisei , Suzuki K Poulose , "H. Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636597044448100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Call KVM's (un)register perf callbacks helpers directly from arm.c and delete perf.c No functional change intended. Signed-off-by: Sean Christopherson Reviewed-by: Marc Zyngier --- arch/arm64/include/asm/kvm_host.h | 3 --- arch/arm64/kvm/Makefile | 2 +- arch/arm64/kvm/arm.c | 5 +++-- arch/arm64/kvm/perf.c | 22 ---------------------- 4 files changed, 4 insertions(+), 28 deletions(-) delete mode 100644 arch/arm64/kvm/perf.c diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm= _host.h index 72e2afe6e8e3..824040b174ab 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -675,9 +675,6 @@ unsigned long kvm_mmio_read_buf(const void *buf, unsign= ed int len); int kvm_handle_mmio_return(struct kvm_vcpu *vcpu); int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa); =20 -void kvm_perf_init(void); -void kvm_perf_teardown(void); - /* * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf e= vent, * arrived in guest context. For arm64, any event that arrives while a vC= PU is diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile index 989bb5dad2c8..0bcc378b7961 100644 --- a/arch/arm64/kvm/Makefile +++ b/arch/arm64/kvm/Makefile @@ -12,7 +12,7 @@ obj-$(CONFIG_KVM) +=3D hyp/ =20 kvm-y :=3D $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \ $(KVM)/vfio.o $(KVM)/irqchip.o $(KVM)/binary_stats.o \ - arm.o mmu.o mmio.o psci.o perf.o hypercalls.o pvtime.o \ + arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \ inject_fault.o va_layout.o handle_exit.o \ guest.o debug.o reset.o sys_regs.o \ vgic-sys-reg-v3.o fpsimd.o pmu.o \ diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 93c952375f3b..8d18a64a72f1 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1776,7 +1776,8 @@ static int init_subsystems(void) if (err) goto out; =20 - kvm_perf_init(); + kvm_register_perf_callbacks(NULL); + kvm_sys_reg_table_init(); =20 out: @@ -2164,7 +2165,7 @@ int kvm_arch_init(void *opaque) /* NOP: Compiling as a module not supported */ void kvm_arch_exit(void) { - kvm_perf_teardown(); + kvm_unregister_perf_callbacks(); } =20 static int __init early_kvm_mode_cfg(char *arg) diff --git a/arch/arm64/kvm/perf.c b/arch/arm64/kvm/perf.c deleted file mode 100644 index 52cfab253c65..000000000000 --- a/arch/arm64/kvm/perf.c +++ /dev/null @@ -1,22 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Based on the x86 implementation. - * - * Copyright (C) 2012 ARM Ltd. - * Author: Marc Zyngier - */ - -#include -#include - -#include - -void kvm_perf_init(void) -{ - kvm_register_perf_callbacks(NULL); -} - -void kvm_perf_teardown(void) -{ - kvm_unregister_perf_callbacks(); -} --=20 2.34.0.rc0.344.g81b53c2807-goog From nobody Thu May 2 14:35:40 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; 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Peter Anvin" , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Stefano Stabellini , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, Artem Kashkanov , Like Xu , Like Xu , Zhu Lingshan X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1636597040597100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Drop perf's stubs for (un)registering guest callbacks now that KVM registration of callbacks is hidden behind GUEST_PERF_EVENTS=3Dy. The only other user is x86 XEN_PV, and x86 unconditionally selects PERF_EVENTS. No functional change intended. Reviewed-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- include/linux/perf_event.h | 5 ----- 1 file changed, 5 deletions(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 0ac7d867ca0c..7b7525e9155f 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1511,11 +1511,6 @@ perf_sw_event(u32 event_id, u64 nr, struct pt_regs *= regs, u64 addr) { } static inline void perf_bp_event(struct perf_event *event, void *data) { } =20 -static inline void perf_register_guest_info_callbacks -(struct perf_guest_info_callbacks *cbs) { } -static inline void perf_unregister_guest_info_callbacks -(struct perf_guest_info_callbacks *cbs) { } - static inline void perf_event_mmap(struct vm_area_struct *vma) { } =20 typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data= ); --=20 2.34.0.rc0.344.g81b53c2807-goog