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KVM: X86: Provide a capability to disable HLT intercepts

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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 <[email protected]>
Cc: Radim Krčmář <[email protected]>
Cc: Jan H. Schönherr <[email protected]>
Signed-off-by: Wanpeng Li <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Wanpeng Li 2018-03-12 04:53:03 -07:00 • committed by Paolo Bonzini
commit caa057a2ca
7 changed files with 46 additions and 2 deletions
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2
Documentation/virtual/kvm/api.txt
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@ -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.
----------------------