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| author | Longpeng(Mike) <longpeng2@huawei.com> | 2017-08-08 07:05:33 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-08-08 11:57:43 +0300 |
| commit | de63ad4cf4973462953c29c363f3cfa7117c2b2d (patch) | |
| tree | b269d3a1c04045d9f4f7005f8004f7da082bf0be /arch/x86/kvm/vmx.c | |
| parent | 199b5763d329b43c88f6ad539db8a6c6b42f8edb (diff) | |
| download | linux-de63ad4cf4973462953c29c363f3cfa7117c2b2d.tar.xz | |
KVM: X86: implement the logic for spinlock optimization
get_cpl requires vcpu_load, so we must cache the result (whether the
vcpu was preempted when its cpl=0) in kvm_vcpu_arch.
Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index fef784c22190..46d08b389e36 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -6781,7 +6781,13 @@ static int handle_pause(struct kvm_vcpu *vcpu) if (ple_gap) grow_ple_window(vcpu); - kvm_vcpu_on_spin(vcpu, false); + /* + * Intel sdm vol3 ch-25.1.3 says: The "PAUSE-loop exiting" + * VM-execution control is ignored if CPL > 0. OTOH, KVM + * never set PAUSE_EXITING and just set PLE if supported, + * so the vcpu must be CPL=0 if it gets a PAUSE exit. + */ + kvm_vcpu_on_spin(vcpu, true); return kvm_skip_emulated_instruction(vcpu); } |