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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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3
arch/x86/kvm/cpuid.c
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@@ -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);