diff options
| author | Wanpeng Li <wanpengli@tencent.com> | 2018-03-12 04:53:03 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-03-16 22:03:52 +0100 |
| commit | caa057a2cad647fb368a12c8e6c410ac4c28e063 (patch) | |
| tree | 704b511957703f1666b9735a516ec21c3e0865ae /arch/x86/kvm/x86.c | |
| parent | 4d5422cea3b61f158d58924cbb43feada456ba5c (diff) | |
| download | lwn-caa057a2cad647fb368a12c8e6c410ac4c28e063.tar.gz lwn-caa057a2cad647fb368a12c8e6c410ac4c28e063.zip | |
KVM: X86: Provide a capability to disable HLT intercepts
If host CPUs are dedicated to a VM, we can avoid VM exits on HLT.
This patch adds the per-VM capability to disable them.
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.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index db95d4d6f57b..9e6aaf62bf3c 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2878,6 +2878,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = KVM_CLOCK_TSC_STABLE; break; case KVM_CAP_X86_DISABLE_EXITS: + r |= KVM_X86_DISABLE_EXITS_HTL; if(kvm_can_mwait_in_guest()) r |= KVM_X86_DISABLE_EXITS_MWAIT; break; @@ -4232,6 +4233,8 @@ split_irqchip_unlock: if ((cap->args[0] & KVM_X86_DISABLE_EXITS_MWAIT) && kvm_can_mwait_in_guest()) kvm->arch.mwait_in_guest = true; + if (cap->args[0] & KVM_X86_DISABLE_EXITS_HTL) + kvm->arch.hlt_in_guest = true; r = 0; break; default: |