Messages in this thread Patch in this message | | | From | Radim Krčmář <> | Subject | [PATCH v2 3/3] KVM: x86: simplify kvm_mwait_in_guest() | Date | Wed, 29 Nov 2017 22:23:43 +0100 |
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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.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> --- arch/x86/kvm/x86.h | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index d15859ec5e92..c69f973111cb 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -265,18 +265,8 @@ static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec) static inline bool kvm_mwait_in_guest(void) { - if (!cpu_has(&boot_cpu_data, X86_FEATURE_MWAIT)) - return false; - - 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; - } + return boot_cpu_has(X86_FEATURE_MWAIT) && + !boot_cpu_has_bug(X86_BUG_MONITOR); } #endif -- 2.14.2
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