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| author |   Jason Baron <jbaron@akamai.com> | 2021-01-14 22:27:56 -0500 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 05:27:30 -0500 |
| commit | b3646477d458fbe7694a15b9c78fbe2fa426b703 (patch) | |
| tree | 6b2c5379acb1a28e4ffce63fc589fc76c18fd678 /arch/x86/kvm/mmu.h | |
| parent | KVM: x86: introduce definitions to support static calls for kvm_x86_ops (diff) | |
| download | linux-dev-b3646477d458fbe7694a15b9c78fbe2fa426b703.tar.xz linux-dev-b3646477d458fbe7694a15b9c78fbe2fa426b703.zip | |
KVM: x86: use static calls to reduce kvm_x86_ops overhead
Convert kvm_x86_ops to use static calls. Note that all kvm_x86_ops are
covered here except for 'pmu_ops and 'nested ops'.
Here are some numbers running cpuid in a loop of 1 million calls averaged
over 5 runs, measured in the vm (lower is better).
Intel Xeon 3000MHz:
|default |mitigations=off
-------------------------------------
vanilla |.671s |.486s
static call|.573s(-15%)|.458s(-6%)
AMD EPYC 2500MHz:
|default |mitigations=off
-------------------------------------
vanilla |.710s |.609s
static call|.664s(-6%) |.609s(0%)
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Signed-off-by: Jason Baron <jbaron@akamai.com>
Message-Id: <e057bf1b8a7ad15652df6eeba3f907ae758d3399.1610680941.git.jbaron@akamai.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.h')
| -rw-r--r-- | arch/x86/kvm/mmu.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 2bb42eee5d5d..c68bfc3e2402 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -102,7 +102,7 @@ static inline void kvm_mmu_load_pgd(struct kvm_vcpu *vcpu) if (!VALID_PAGE(root_hpa)) return; - kvm_x86_ops.load_mmu_pgd(vcpu, root_hpa | kvm_get_active_pcid(vcpu), + static_call(kvm_x86_load_mmu_pgd)(vcpu, root_hpa | kvm_get_active_pcid(vcpu), vcpu->arch.mmu->shadow_root_level); } @@ -174,8 +174,8 @@ static inline u8 permission_fault(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned pte_access, unsigned pte_pkey, unsigned pfec) { - int cpl = kvm_x86_ops.get_cpl(vcpu); - unsigned long rflags = kvm_x86_ops.get_rflags(vcpu); + int cpl = static_call(kvm_x86_get_cpl)(vcpu); + unsigned long rflags = static_call(kvm_x86_get_rflags)(vcpu); /* * If CPL < 3, SMAP prevention are disabled if EFLAGS.AC = 1. |