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kvm: x86: add host poll control msrs

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Add an MSRs which allows the guest to disable
host polling (specifically the cpuidle-haltpoll,
when performing polling in the guest, disables
host side polling).

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marcelo Tosatti
2019-06-03 19:52:44 -03:00
committed by Paolo Bonzini
parent fdb28619a8
commit 2d5ba19bdf
6 changed files with 39 additions and 1 deletions
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23
arch/x86/kvm/x86.c
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@@ -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);