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Mon, 02 Dec 2024 17:00:25 -0800 (PST) Date: Tue, 3 Dec 2024 00:59:20 +0000 In-Reply-To: <20241203005921.1119116-1-kevinloughlin@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241203005921.1119116-1-kevinloughlin@google.com> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Message-ID: <20241203005921.1119116-2-kevinloughlin@google.com> Subject: [RFC PATCH 1/2] x86, lib, xenpv: Add WBNOINVD helper functions From: Kevin Loughlin To: linux-kernel@vger.kernel.org Cc: seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, kvm@vger.kernel.org, thomas.lendacky@amd.com, pgonda@google.com, sidtelang@google.com, mizhang@google.com, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, bcm-kernel-feedback-list@broadcom.com, Kevin Loughlin Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In line with WBINVD usage, add WBONINVD helper functions, accounting for kernels built with and without CONFIG_PARAVIRT_XXL. Signed-off-by: Kevin Loughlin --- arch/x86/include/asm/paravirt.h | 7 +++++++ arch/x86/include/asm/paravirt_types.h | 1 + arch/x86/include/asm/smp.h | 7 +++++++ arch/x86/include/asm/special_insns.h | 12 +++++++++++- arch/x86/kernel/paravirt.c | 6 ++++++ arch/x86/lib/cache-smp.c | 12 ++++++++++++ arch/x86/xen/enlighten_pv.c | 1 + 7 files changed, 45 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravir= t.h index d4eb9e1d61b8..c040af2d8eff 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -187,6 +187,13 @@ static __always_inline void wbinvd(void) PVOP_ALT_VCALL0(cpu.wbinvd, "wbinvd", ALT_NOT_XEN); } =20 +extern noinstr void pv_native_wbnoinvd(void); + +static __always_inline void wbnoinvd(void) +{ + PVOP_ALT_VCALL0(cpu.wbnoinvd, "wbnoinvd", ALT_NOT_XEN); +} + static inline u64 paravirt_read_msr(unsigned msr) { return PVOP_CALL1(u64, cpu.read_msr, msr); diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/p= aravirt_types.h index 8d4fbe1be489..9a3f38ad1958 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -87,6 +87,7 @@ struct pv_cpu_ops { #endif =20 void (*wbinvd)(void); + void (*wbnoinvd)(void); =20 /* cpuid emulation, mostly so that caps bits can be disabled */ void (*cpuid)(unsigned int *eax, unsigned int *ebx, diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index ca073f40698f..ecf93a243b83 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -112,6 +112,7 @@ void native_play_dead(void); void play_dead_common(void); void wbinvd_on_cpu(int cpu); int wbinvd_on_all_cpus(void); +int wbnoinvd_on_all_cpus(void); =20 void smp_kick_mwait_play_dead(void); =20 @@ -160,6 +161,12 @@ static inline int wbinvd_on_all_cpus(void) return 0; } =20 +static inline int wbnoinvd_on_all_cpus(void) +{ + wbnoinvd(); + return 0; +} + static inline struct cpumask *cpu_llc_shared_mask(int cpu) { return (struct cpumask *)cpumask_of(0); diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/sp= ecial_insns.h index aec6e2d3aa1d..c2d16ddcd79b 100644 --- a/arch/x86/include/asm/special_insns.h +++ b/arch/x86/include/asm/special_insns.h @@ -117,7 +117,12 @@ static inline void wrpkru(u32 pkru) =20 static __always_inline void native_wbinvd(void) { - asm volatile("wbinvd": : :"memory"); + asm volatile("wbinvd" : : : "memory"); +} + +static __always_inline void native_wbnoinvd(void) +{ + asm volatile("wbnoinvd" : : : "memory"); } =20 static inline unsigned long __read_cr4(void) @@ -173,6 +178,11 @@ static __always_inline void wbinvd(void) native_wbinvd(); } =20 +static __always_inline void wbnoinvd(void) +{ + native_wbnoinvd(); +} + #endif /* CONFIG_PARAVIRT_XXL */ =20 static __always_inline void clflush(volatile void *__p) diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index fec381533555..a66b708d8a1e 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -121,6 +121,11 @@ noinstr void pv_native_wbinvd(void) native_wbinvd(); } =20 +noinstr void pv_native_wbnoinvd(void) +{ + native_wbnoinvd(); +} + static noinstr void pv_native_safe_halt(void) { native_safe_halt(); @@ -149,6 +154,7 @@ struct paravirt_patch_template pv_ops =3D { .cpu.write_cr0 =3D native_write_cr0, .cpu.write_cr4 =3D native_write_cr4, .cpu.wbinvd =3D pv_native_wbinvd, + .cpu.wbnoinvd =3D pv_native_wbnoinvd, .cpu.read_msr =3D native_read_msr, .cpu.write_msr =3D native_write_msr, .cpu.read_msr_safe =3D native_read_msr_safe, diff --git a/arch/x86/lib/cache-smp.c b/arch/x86/lib/cache-smp.c index 7af743bd3b13..7ac5cca53031 100644 --- a/arch/x86/lib/cache-smp.c +++ b/arch/x86/lib/cache-smp.c @@ -20,3 +20,15 @@ int wbinvd_on_all_cpus(void) return 0; } EXPORT_SYMBOL(wbinvd_on_all_cpus); + +static void __wbnoinvd(void *dummy) +{ + wbnoinvd(); +} + +int wbnoinvd_on_all_cpus(void) +{ + on_each_cpu(__wbnoinvd, NULL, 1); + return 0; +} +EXPORT_SYMBOL(wbnoinvd_on_all_cpus); diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index d6818c6cafda..a5c76a6f8976 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -1162,6 +1162,7 @@ static const typeof(pv_ops) xen_cpu_ops __initconst = =3D { .write_cr4 =3D xen_write_cr4, =20 .wbinvd =3D pv_native_wbinvd, + .wbnoinvd =3D pv_native_wbnoinvd, =20 .read_msr =3D xen_read_msr, .write_msr =3D xen_write_msr, --=20 2.47.0.338.g60cca15819-goog