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KVM: x86: simplify kvm_mwait_in_guest()

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If Intel/AMD implements MWAIT, we expect that it works well and only
reject known bugs;  no reason to do it the other way around for minor
vendors.  (Not that they are relevant ATM.)

This allows further simplification of kvm_mwait_in_guest().
And use boot_cpu_has() instead of "cpu_has(&boot_cpu_data," while at it.

Reviewed-by: Alexander Graf <agraf@suse.de>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář 2017-11-29 22:23:43 +01:00 committed by Paolo Bonzini
parent 346f48fa31
commit 431f5d4443
1 changed files with 2 additions and 12 deletions
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14
arch/x86/kvm/x86.h
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@ -265,18 +265,8 @@ static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
static inline bool kvm_mwait_in_guest(void) static inline bool kvm_mwait_in_guest(void)
{ {
if (!cpu_has(&boot_cpu_data, X86_FEATURE_MWAIT)) return boot_cpu_has(X86_FEATURE_MWAIT) &&
return false; !boot_cpu_has_bug(X86_BUG_MONITOR);
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
/* All AMD CPUs have a working MWAIT implementation */
return true;
case X86_VENDOR_INTEL:
return !boot_cpu_has_bug(X86_BUG_MONITOR);
default:
return false;
}
} }
#endif #endif