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| 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 /Documentation/virtual | |
| parent | 4d5422cea3b61f158d58924cbb43feada456ba5c (diff) | |
| download | linux-caa057a2cad647fb368a12c8e6c410ac4c28e063.tar.gz linux-caa057a2cad647fb368a12c8e6c410ac4c28e063.tar.bz2 linux-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 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 744a202cca31..e9c74876f177 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -4367,6 +4367,7 @@ Returns: 0 on success, -EINVAL when args[0] contains invalid exits Valid bits in args[0] are #define KVM_X86_DISABLE_EXITS_MWAIT (1 << 0) +#define KVM_X86_DISABLE_EXITS_HLT (1 << 1) Enabling this capability on a VM provides userspace with a way to no longer intercept some instructions for improved latency in some @@ -4375,6 +4376,7 @@ physical CPUs. More bits can be added in the future; userspace can just pass the KVM_CHECK_EXTENSION result to KVM_ENABLE_CAP to disable all such vmexits. +Do not enable KVM_FEATURE_PV_UNHALT if you disable HLT exits. 8. Other capabilities. ---------------------- |