From b31c114b82b2b55913d2cf744e6a665c2ca090ac Mon Sep 17 00:00:00 2001 From: Wanpeng Li Date: Mon, 12 Mar 2018 04:53:04 -0700 Subject: KVM: X86: Provide a capability to disable PAUSE intercepts MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Allow to disable pause loop exit/pause filtering on a per VM basis. If some VMs have dedicated host CPUs, they won't be negatively affected due to needlessly intercepted PAUSE instructions. Thanks to Jan H. Schönherr's initial patch. Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Jan H. Schönherr Signed-off-by: Wanpeng Li Signed-off-by: Paolo Bonzini --- arch/x86/kvm/x86.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'arch/x86/kvm/x86.h') diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index 6d14589c1a91..b620cfa8e8d5 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -266,8 +266,10 @@ static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec) #define KVM_X86_DISABLE_EXITS_MWAIT (1 << 0) #define KVM_X86_DISABLE_EXITS_HTL (1 << 1) +#define KVM_X86_DISABLE_EXITS_PAUSE (1 << 2) #define KVM_X86_DISABLE_VALID_EXITS (KVM_X86_DISABLE_EXITS_MWAIT | \ - KVM_X86_DISABLE_EXITS_HTL) + KVM_X86_DISABLE_EXITS_HTL | \ + KVM_X86_DISABLE_EXITS_PAUSE) static inline bool kvm_mwait_in_guest(struct kvm *kvm) { @@ -279,4 +281,9 @@ static inline bool kvm_hlt_in_guest(struct kvm *kvm) return kvm->arch.hlt_in_guest; } +static inline bool kvm_pause_in_guest(struct kvm *kvm) +{ + return kvm->arch.pause_in_guest; +} + #endif -- cgit v1.2.3