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authorWanpeng Li <wanpengli@tencent.com>2018-03-12 04:53:02 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2018-03-16 22:03:51 +0100
commit4d5422cea3b61f158d58924cbb43feada456ba5c (patch)
tree0657ac655c54892dd6498d8e20b89380255d592a /arch/x86/kvm/x86.h
parent4956aa3b8b59e336b77f1df0ac7ce1a94c0265f2 (diff)
downloadlinux-4d5422cea3b61f158d58924cbb43feada456ba5c.tar.bz2
KVM: X86: Provide a capability to disable MWAIT intercepts
Allowing a guest to execute MWAIT without interception enables a guest to put a (physical) CPU into a power saving state, where it takes longer to return from than what may be desired by the host. Don't give a guest that power over a host by default. (Especially, since nothing prevents a guest from using MWAIT even when it is not advertised via CPUID.) Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Jan H. Schönherr <jschoenh@amazon.de> Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.h')
-rw-r--r--arch/x86/kvm/x86.h10
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 18e2e0a91edc..026b239bf058 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -2,8 +2,6 @@
#ifndef ARCH_X86_KVM_X86_H
#define ARCH_X86_KVM_X86_H
-#include <asm/processor.h>
-#include <asm/mwait.h>
#include <linux/kvm_host.h>
#include <asm/pvclock.h>
#include "kvm_cache_regs.h"
@@ -266,10 +264,12 @@ static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
__rem; \
})
-static inline bool kvm_mwait_in_guest(void)
+#define KVM_X86_DISABLE_EXITS_MWAIT (1 << 0)
+#define KVM_X86_DISABLE_VALID_EXITS (KVM_X86_DISABLE_EXITS_MWAIT)
+
+static inline bool kvm_mwait_in_guest(struct kvm *kvm)
{
- return boot_cpu_has(X86_FEATURE_MWAIT) &&
- !boot_cpu_has_bug(X86_BUG_MONITOR);
+ return kvm->arch.mwait_in_guest;
}
#endif