diff options
| -rw-r--r-- | Documentation/virtual/kvm/msr.txt | 9 | ||||
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/uapi/asm/kvm_para.h | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 3 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 23 |
6 files changed, 39 insertions, 1 deletions
diff --git a/Documentation/virtual/kvm/msr.txt b/Documentation/virtual/kvm/msr.txt index f3f0d57ced8e..df1f4338b3ca 100644 --- a/Documentation/virtual/kvm/msr.txt +++ b/Documentation/virtual/kvm/msr.txt @@ -273,3 +273,12 @@ MSR_KVM_EOI_EN: 0x4b564d04 guest must both read the least significant bit in the memory area and clear it using a single CPU instruction, such as test and clear, or compare and exchange. + +MSR_KVM_POLL_CONTROL: 0x4b564d05 + Control host-side polling. + + data: Bit 0 enables (1) or disables (0) host-side HLT polling logic. + + KVM guests can request the host not to poll on HLT, for example if + they are performing polling themselves. + diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index aeadbc770eb2..a86026969b19 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -755,6 +755,8 @@ struct kvm_vcpu_arch { struct gfn_to_hva_cache data; } pv_eoi; + u64 msr_kvm_poll_control; + /* * Indicate whether the access faults on its page table in guest * which is set when fix page fault and used to detect unhandeable diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h index 19980ec1a316..21d5f0240595 100644 --- a/arch/x86/include/uapi/asm/kvm_para.h +++ b/arch/x86/include/uapi/asm/kvm_para.h @@ -29,6 +29,7 @@ #define KVM_FEATURE_PV_TLB_FLUSH 9 #define KVM_FEATURE_ASYNC_PF_VMEXIT 10 #define KVM_FEATURE_PV_SEND_IPI 11 +#define KVM_FEATURE_POLL_CONTROL 12 #define KVM_HINTS_REALTIME 0 @@ -47,6 +48,7 @@ #define MSR_KVM_ASYNC_PF_EN 0x4b564d02 #define MSR_KVM_STEAL_TIME 0x4b564d03 #define MSR_KVM_PV_EOI_EN 0x4b564d04 +#define MSR_KVM_POLL_CONTROL 0x4b564d05 struct kvm_steal_time { __u64 steal; diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index fc042419e670..840e12583b85 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -41,6 +41,7 @@ config KVM select PERF_EVENTS select HAVE_KVM_MSI select HAVE_KVM_CPU_RELAX_INTERCEPT + select HAVE_KVM_NO_POLL select KVM_GENERIC_DIRTYLOG_READ_PROTECT select KVM_VFIO select SRCU diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 9872f86fdbe9..68c74e948e28 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -658,7 +658,8 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, (1 << KVM_FEATURE_PV_UNHALT) | (1 << KVM_FEATURE_PV_TLB_FLUSH) | (1 << KVM_FEATURE_ASYNC_PF_VMEXIT) | - (1 << KVM_FEATURE_PV_SEND_IPI); + (1 << KVM_FEATURE_PV_SEND_IPI) | + (1 << KVM_FEATURE_POLL_CONTROL); if (sched_info_on()) entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index eadd987ae350..eb87d71ec14a 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1177,6 +1177,7 @@ static u32 emulated_msrs[] = { MSR_IA32_POWER_CTL, MSR_K7_HWCR, + MSR_KVM_POLL_CONTROL, }; static unsigned num_emulated_msrs; @@ -2636,6 +2637,14 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) return 1; break; + case MSR_KVM_POLL_CONTROL: + /* only enable bit supported */ + if (data & (-1ULL << 1)) + return 1; + + vcpu->arch.msr_kvm_poll_control = data; + break; + case MSR_IA32_MCG_CTL: case MSR_IA32_MCG_STATUS: case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: @@ -2885,6 +2894,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) case MSR_KVM_PV_EOI_EN: msr_info->data = vcpu->arch.pv_eoi.msr_val; break; + case MSR_KVM_POLL_CONTROL: + msr_info->data = vcpu->arch.msr_kvm_poll_control; + break; case MSR_IA32_P5_MC_ADDR: case MSR_IA32_P5_MC_TYPE: case MSR_IA32_MCG_CAP: @@ -8861,6 +8873,10 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) msr.host_initiated = true; kvm_write_tsc(vcpu, &msr); vcpu_put(vcpu); + + /* poll control enabled by default */ + vcpu->arch.msr_kvm_poll_control = 1; + mutex_unlock(&vcpu->mutex); if (!kvmclock_periodic_sync) @@ -9972,6 +9988,13 @@ bool kvm_vector_hashing_enabled(void) } EXPORT_SYMBOL_GPL(kvm_vector_hashing_enabled); +bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) +{ + return (vcpu->arch.msr_kvm_poll_control & 1) == 0; +} +EXPORT_SYMBOL_GPL(kvm_arch_no_poll); + + EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); |