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| author | Wanpeng Li <wanpengli@tencent.com> | 2020-04-10 10:47:03 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-04-21 09:13:10 -0400 |
| commit | a9ab13ff6e844ad5b3ed39339e6db9a76bb539ad (patch) | |
| tree | baeae7a8f3432482d785309797a7124a3c6da7aa /arch/x86/include/asm/kvm_host.h | |
| parent | 873e1da16918a83cc7440e299dda0dc7ab6db34c (diff) | |
| download | linux-stable-a9ab13ff6e844ad5b3ed39339e6db9a76bb539ad.tar.gz linux-stable-a9ab13ff6e844ad5b3ed39339e6db9a76bb539ad.tar.bz2 linux-stable-a9ab13ff6e844ad5b3ed39339e6db9a76bb539ad.zip | |
KVM: X86: Improve latency for single target IPI fastpath
IPI and Timer cause the main MSRs write vmexits in cloud environment
observation, let's optimize virtual IPI latency more aggressively to
inject target IPI as soon as possible.
Running kvm-unit-tests/vmexit.flat IPI testing on SKX server, disable
adaptive advance lapic timer and adaptive halt-polling to avoid the
interference, this patch can give another 7% improvement.
w/o fastpath -> x86.c fastpath 4238 -> 3543 16.4%
x86.c fastpath -> vmx.c fastpath 3543 -> 3293 7%
w/o fastpath -> vmx.c fastpath 4238 -> 3293 22.3%
Cc: Haiwei Li <lihaiwei@tencent.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200410174703.1138-3-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_host.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index ceba205d32a2..f26df2cb0591 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1126,7 +1126,7 @@ struct kvm_x86_ops { */ void (*tlb_flush_guest)(struct kvm_vcpu *vcpu); - void (*run)(struct kvm_vcpu *vcpu); + enum exit_fastpath_completion (*run)(struct kvm_vcpu *vcpu); int (*handle_exit)(struct kvm_vcpu *vcpu, enum exit_fastpath_completion exit_fastpath); int (*skip_emulated_instruction)(struct kvm_vcpu *vcpu); @@ -1176,8 +1176,7 @@ struct kvm_x86_ops { struct x86_instruction_info *info, enum x86_intercept_stage stage, struct x86_exception *exception); - void (*handle_exit_irqoff)(struct kvm_vcpu *vcpu, - enum exit_fastpath_completion *exit_fastpath); + void (*handle_exit_irqoff)(struct kvm_vcpu *vcpu); int (*check_nested_events)(struct kvm_vcpu *vcpu); void (*request_immediate_exit)(struct kvm_vcpu *vcpu); |