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Fri, 04 Oct 2024 09:34:47 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF67s4D1Ii/IMMe2GAX9UH7hLrSGGxilQetKOGJqXYtO+ayn0lNPLARd66ttOkIMIvzia1XzQ== X-Received: by 2002:a5d:6649:0:b0:377:6073:48df with SMTP id ffacd0b85a97d-37d0eaea921mr2061365f8f.58.1728059686503; Fri, 04 Oct 2024 09:34:46 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Ani Sinha Subject: [PULL 09/23] kvm/i386: refactor kvm_arch_init and split it into smaller functions Date: Fri, 4 Oct 2024 18:34:01 +0200 Message-ID: <20241004163415.951106-10-pbonzini@redhat.com> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20241004163415.951106-1-pbonzini@redhat.com> References: <20241004163415.951106-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.146, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1728059805991116600 Content-Type: text/plain; charset="utf-8" From: Ani Sinha kvm_arch_init() enables a lot of vm capabilities. Refactor them into separa= te smaller functions. Energy MSR related operations also moved to its own function. There should be no functional impact. Signed-off-by: Ani Sinha Link: https://lore.kernel.org/r/20240903124143.39345-2-anisinha@redhat.com Signed-off-by: Paolo Bonzini --- target/i386/kvm/kvm.c | 327 ++++++++++++++++++++++++++---------------- 1 file changed, 201 insertions(+), 126 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index fa0be5537fa..64ef2db9238 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -3005,10 +3005,185 @@ int kvm_arch_get_default_type(MachineState *ms) return 0; } =20 +static int kvm_vm_enable_exception_payload(KVMState *s) +{ + int ret =3D 0; + has_exception_payload =3D kvm_check_extension(s, KVM_CAP_EXCEPTION_PAY= LOAD); + if (has_exception_payload) { + ret =3D kvm_vm_enable_cap(s, KVM_CAP_EXCEPTION_PAYLOAD, 0, true); + if (ret < 0) { + error_report("kvm: Failed to enable exception payload cap: %s", + strerror(-ret)); + } + } + + return ret; +} + +static int kvm_vm_enable_triple_fault_event(KVMState *s) +{ + int ret =3D 0; + has_triple_fault_event =3D \ + kvm_check_extension(s, + KVM_CAP_X86_TRIPLE_FAULT_EVENT); + if (has_triple_fault_event) { + ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_TRIPLE_FAULT_EVENT, 0, tr= ue); + if (ret < 0) { + error_report("kvm: Failed to enable triple fault event cap: %s= ", + strerror(-ret)); + } + } + return ret; +} + +static int kvm_vm_set_identity_map_addr(KVMState *s, uint64_t *identity_ba= se) +{ + /* + * On older Intel CPUs, KVM uses vm86 mode to emulate 16-bit code dire= ctly. + * In order to use vm86 mode, an EPT identity map and a TSS are neede= d. + * Since these must be part of guest physical memory, we need to alloc= ate + * them, both by setting their start addresses in the kernel and by + * creating a corresponding e820 entry. We need 4 pages before the BIO= S, + * so this value allows up to 16M BIOSes. + */ + *identity_base =3D 0xfeffc000; + return kvm_vm_ioctl(s, KVM_SET_IDENTITY_MAP_ADDR, identity_base); +} + +static int kvm_vm_set_nr_mmu_pages(KVMState *s) +{ + uint64_t shadow_mem; + int ret =3D 0; + shadow_mem =3D object_property_get_int(OBJECT(s), + "kvm-shadow-mem", + &error_abort); + if (shadow_mem !=3D -1) { + shadow_mem /=3D 4096; + ret =3D kvm_vm_ioctl(s, KVM_SET_NR_MMU_PAGES, shadow_mem); + } + return ret; +} + +static int kvm_vm_set_tss_addr(KVMState *s, uint64_t identity_base) +{ + /* Set TSS base one page after EPT identity map. */ + return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, identity_base); +} + +static int kvm_vm_enable_disable_exits(KVMState *s) +{ + int disable_exits =3D kvm_check_extension(s, KVM_CAP_X86_DISABLE_EXITS= ); +/* Work around for kernel header with a typo. TODO: fix header and drop. */ +#if defined(KVM_X86_DISABLE_EXITS_HTL) && !defined(KVM_X86_DISABLE_EXITS_H= LT) +#define KVM_X86_DISABLE_EXITS_HLT KVM_X86_DISABLE_EXITS_HTL +#endif + if (disable_exits) { + disable_exits &=3D (KVM_X86_DISABLE_EXITS_MWAIT | + KVM_X86_DISABLE_EXITS_HLT | + KVM_X86_DISABLE_EXITS_PAUSE | + KVM_X86_DISABLE_EXITS_CSTATE); + } + + return kvm_vm_enable_cap(s, KVM_CAP_X86_DISABLE_EXITS, 0, + disable_exits); +} + +static int kvm_vm_enable_bus_lock_exit(KVMState *s) +{ + int ret =3D 0; + ret =3D kvm_check_extension(s, KVM_CAP_X86_BUS_LOCK_EXIT); + if (!(ret & KVM_BUS_LOCK_DETECTION_EXIT)) { + error_report("kvm: bus lock detection unsupported"); + return -ENOTSUP; + } + ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_BUS_LOCK_EXIT, 0, + KVM_BUS_LOCK_DETECTION_EXIT); + if (ret < 0) { + error_report("kvm: Failed to enable bus lock detection cap: %s", + strerror(-ret)); + } + + return ret; +} + +static int kvm_vm_enable_notify_vmexit(KVMState *s) +{ + int ret =3D 0; + if (s->notify_vmexit !=3D NOTIFY_VMEXIT_OPTION_DISABLE) { + uint64_t notify_window_flags =3D + ((uint64_t)s->notify_window << 32) | + KVM_X86_NOTIFY_VMEXIT_ENABLED | + KVM_X86_NOTIFY_VMEXIT_USER; + ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_NOTIFY_VMEXIT, 0, + notify_window_flags); + if (ret < 0) { + error_report("kvm: Failed to enable notify vmexit cap: %s", + strerror(-ret)); + } + } + return ret; +} + +static int kvm_vm_enable_userspace_msr(KVMState *s) +{ + int ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_USER_SPACE_MSR, 0, + KVM_MSR_EXIT_REASON_FILTER); + if (ret < 0) { + error_report("Could not enable user space MSRs: %s", + strerror(-ret)); + exit(1); + } + + if (!kvm_filter_msr(s, MSR_CORE_THREAD_COUNT, + kvm_rdmsr_core_thread_count, NULL)) { + error_report("Could not install MSR_CORE_THREAD_COUNT handler!"); + exit(1); + } + + return 0; +} + +static void kvm_vm_enable_energy_msrs(KVMState *s) +{ + bool r; + if (s->msr_energy.enable =3D=3D true) { + r =3D kvm_filter_msr(s, MSR_RAPL_POWER_UNIT, + kvm_rdmsr_rapl_power_unit, NULL); + if (!r) { + error_report("Could not install MSR_RAPL_POWER_UNIT \ + handler"); + exit(1); + } + + r =3D kvm_filter_msr(s, MSR_PKG_POWER_LIMIT, + kvm_rdmsr_pkg_power_limit, NULL); + if (!r) { + error_report("Could not install MSR_PKG_POWER_LIMIT \ + handler"); + exit(1); + } + + r =3D kvm_filter_msr(s, MSR_PKG_POWER_INFO, + kvm_rdmsr_pkg_power_info, NULL); + if (!r) { + error_report("Could not install MSR_PKG_POWER_INFO \ + handler"); + exit(1); + } + r =3D kvm_filter_msr(s, MSR_PKG_ENERGY_STATUS, + kvm_rdmsr_pkg_energy_status, NULL); + if (!r) { + error_report("Could not install MSR_PKG_ENERGY_STATUS \ + handler"); + exit(1); + } + } + return; +} + int kvm_arch_init(MachineState *ms, KVMState *s) { uint64_t identity_base =3D 0xfffbc000; - uint64_t shadow_mem; int ret; struct utsname utsname; Error *local_err =3D NULL; @@ -3038,24 +3213,14 @@ int kvm_arch_init(MachineState *ms, KVMState *s) =20 hv_vpindex_settable =3D kvm_check_extension(s, KVM_CAP_HYPERV_VP_INDEX= ); =20 - has_exception_payload =3D kvm_check_extension(s, KVM_CAP_EXCEPTION_PAY= LOAD); - if (has_exception_payload) { - ret =3D kvm_vm_enable_cap(s, KVM_CAP_EXCEPTION_PAYLOAD, 0, true); - if (ret < 0) { - error_report("kvm: Failed to enable exception payload cap: %s", - strerror(-ret)); - return ret; - } + ret =3D kvm_vm_enable_exception_payload(s); + if (ret < 0) { + return ret; } =20 - has_triple_fault_event =3D kvm_check_extension(s, KVM_CAP_X86_TRIPLE_F= AULT_EVENT); - if (has_triple_fault_event) { - ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_TRIPLE_FAULT_EVENT, 0, tr= ue); - if (ret < 0) { - error_report("kvm: Failed to enable triple fault event cap: %s= ", - strerror(-ret)); - return ret; - } + ret =3D kvm_vm_enable_triple_fault_event(s); + if (ret < 0) { + return ret; } =20 if (s->xen_version) { @@ -3086,22 +3251,12 @@ int kvm_arch_init(MachineState *ms, KVMState *s) uname(&utsname); lm_capable_kernel =3D strcmp(utsname.machine, "x86_64") =3D=3D 0; =20 - /* - * On older Intel CPUs, KVM uses vm86 mode to emulate 16-bit code dire= ctly. - * In order to use vm86 mode, an EPT identity map and a TSS are neede= d. - * Since these must be part of guest physical memory, we need to alloc= ate - * them, both by setting their start addresses in the kernel and by - * creating a corresponding e820 entry. We need 4 pages before the BIO= S, - * so this value allows up to 16M BIOSes. - */ - identity_base =3D 0xfeffc000; - ret =3D kvm_vm_ioctl(s, KVM_SET_IDENTITY_MAP_ADDR, &identity_base); + ret =3D kvm_vm_set_identity_map_addr(s, &identity_base); if (ret < 0) { return ret; } =20 - /* Set TSS base one page after EPT identity map. */ - ret =3D kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, identity_base + 0x1000); + ret =3D kvm_vm_set_tss_addr(s, identity_base + 0x1000); if (ret < 0) { return ret; } @@ -3109,13 +3264,9 @@ int kvm_arch_init(MachineState *ms, KVMState *s) /* Tell fw_cfg to notify the BIOS to reserve the range. */ e820_add_entry(identity_base, 0x4000, E820_RESERVED); =20 - shadow_mem =3D object_property_get_int(OBJECT(s), "kvm-shadow-mem", &e= rror_abort); - if (shadow_mem !=3D -1) { - shadow_mem /=3D 4096; - ret =3D kvm_vm_ioctl(s, KVM_SET_NR_MMU_PAGES, shadow_mem); - if (ret < 0) { - return ret; - } + ret =3D kvm_vm_set_nr_mmu_pages(s); + if (ret < 0) { + return ret; } =20 if (kvm_check_extension(s, KVM_CAP_X86_SMM) && @@ -3126,20 +3277,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) } =20 if (enable_cpu_pm) { - int disable_exits =3D kvm_check_extension(s, KVM_CAP_X86_DISABLE_E= XITS); -/* Work around for kernel header with a typo. TODO: fix header and drop. */ -#if defined(KVM_X86_DISABLE_EXITS_HTL) && !defined(KVM_X86_DISABLE_EXITS_H= LT) -#define KVM_X86_DISABLE_EXITS_HLT KVM_X86_DISABLE_EXITS_HTL -#endif - if (disable_exits) { - disable_exits &=3D (KVM_X86_DISABLE_EXITS_MWAIT | - KVM_X86_DISABLE_EXITS_HLT | - KVM_X86_DISABLE_EXITS_PAUSE | - KVM_X86_DISABLE_EXITS_CSTATE); - } - - ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_DISABLE_EXITS, 0, - disable_exits); + ret =3D kvm_vm_enable_disable_exits(s); if (ret < 0) { error_report("kvm: guest stopping CPU not supported: %s", strerror(-ret)); @@ -3150,16 +3288,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s) X86MachineState *x86ms =3D X86_MACHINE(ms); =20 if (x86ms->bus_lock_ratelimit > 0) { - ret =3D kvm_check_extension(s, KVM_CAP_X86_BUS_LOCK_EXIT); - if (!(ret & KVM_BUS_LOCK_DETECTION_EXIT)) { - error_report("kvm: bus lock detection unsupported"); - return -ENOTSUP; - } - ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_BUS_LOCK_EXIT, 0, - KVM_BUS_LOCK_DETECTION_EXIT); + ret =3D kvm_vm_enable_bus_lock_exit(s); if (ret < 0) { - error_report("kvm: Failed to enable bus lock detection cap= : %s", - strerror(-ret)); return ret; } ratelimit_init(&bus_lock_ratelimit_ctrl); @@ -3168,80 +3298,25 @@ int kvm_arch_init(MachineState *ms, KVMState *s) } } =20 - if (s->notify_vmexit !=3D NOTIFY_VMEXIT_OPTION_DISABLE && - kvm_check_extension(s, KVM_CAP_X86_NOTIFY_VMEXIT)) { - uint64_t notify_window_flags =3D - ((uint64_t)s->notify_window << 32) | - KVM_X86_NOTIFY_VMEXIT_ENABLED | - KVM_X86_NOTIFY_VMEXIT_USER; - ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_NOTIFY_VMEXIT, 0, - notify_window_flags); - if (ret < 0) { - error_report("kvm: Failed to enable notify vmexit cap: %s", - strerror(-ret)); - return ret; - } - } - if (kvm_vm_check_extension(s, KVM_CAP_X86_USER_SPACE_MSR)) { - bool r; - - ret =3D kvm_vm_enable_cap(s, KVM_CAP_X86_USER_SPACE_MSR, 0, - KVM_MSR_EXIT_REASON_FILTER); - if (ret) { - error_report("Could not enable user space MSRs: %s", - strerror(-ret)); - exit(1); + if (kvm_check_extension(s, KVM_CAP_X86_NOTIFY_VMEXIT)) { + ret =3D kvm_vm_enable_notify_vmexit(s); + if (ret < 0) { + return ret; } + } =20 - r =3D kvm_filter_msr(s, MSR_CORE_THREAD_COUNT, - kvm_rdmsr_core_thread_count, NULL); - if (!r) { - error_report("Could not install MSR_CORE_THREAD_COUNT handler:= %s", - strerror(-ret)); - exit(1); + if (kvm_vm_check_extension(s, KVM_CAP_X86_USER_SPACE_MSR)) { + ret =3D kvm_vm_enable_userspace_msr(s); + if (ret < 0) { + return ret; } =20 if (s->msr_energy.enable =3D=3D true) { - r =3D kvm_filter_msr(s, MSR_RAPL_POWER_UNIT, - kvm_rdmsr_rapl_power_unit, NULL); - if (!r) { - error_report("Could not install MSR_RAPL_POWER_UNIT \ - handler: %s", - strerror(-ret)); + kvm_vm_enable_energy_msrs(s); + if (kvm_msr_energy_thread_init(s, ms)) { + error_report("kvm : error RAPL feature requirement not met= "); exit(1); } - - r =3D kvm_filter_msr(s, MSR_PKG_POWER_LIMIT, - kvm_rdmsr_pkg_power_limit, NULL); - if (!r) { - error_report("Could not install MSR_PKG_POWER_LIMIT \ - handler: %s", - strerror(-ret)); - exit(1); - } - - r =3D kvm_filter_msr(s, MSR_PKG_POWER_INFO, - kvm_rdmsr_pkg_power_info, NULL); - if (!r) { - error_report("Could not install MSR_PKG_POWER_INFO \ - handler: %s", - strerror(-ret)); - exit(1); - } - r =3D kvm_filter_msr(s, MSR_PKG_ENERGY_STATUS, - kvm_rdmsr_pkg_energy_status, NULL); - if (!r) { - error_report("Could not install MSR_PKG_ENERGY_STATUS \ - handler: %s", - strerror(-ret)); - exit(1); - } - r =3D kvm_msr_energy_thread_init(s, ms); - if (r) { - error_report("kvm : error RAPL feature requirement not mee= t"); - exit(1); - } - } } =20 --=20 2.46.1