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| author | Jason Baron <jbaron@akamai.com> | 2021-01-15 06:27:56 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 13:27:30 +0300 |
| commit | b3646477d458fbe7694a15b9c78fbe2fa426b703 (patch) | |
| tree | 6b2c5379acb1a28e4ffce63fc589fc76c18fd678 /arch/x86/kvm/x86.h | |
| parent | 9af5471bdbb2a26a1a46cd834e9fda6db6a9670e (diff) | |
| download | linux-b3646477d458fbe7694a15b9c78fbe2fa426b703.tar.xz | |
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/x86.h')
| -rw-r--r-- | arch/x86/kvm/x86.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index f88045a8af53..5f7c224f4bf2 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -98,7 +98,7 @@ static inline bool is_64_bit_mode(struct kvm_vcpu *vcpu) if (!is_long_mode(vcpu)) return false; - kvm_x86_ops.get_cs_db_l_bits(vcpu, &cs_db, &cs_l); + static_call(kvm_x86_get_cs_db_l_bits)(vcpu, &cs_db, &cs_l); return cs_l; } @@ -129,7 +129,7 @@ static inline bool mmu_is_nested(struct kvm_vcpu *vcpu) static inline void kvm_vcpu_flush_tlb_current(struct kvm_vcpu *vcpu) { ++vcpu->stat.tlb_flush; - kvm_x86_ops.tlb_flush_current(vcpu); + static_call(kvm_x86_tlb_flush_current)(vcpu); } static inline int is_pae(struct kvm_vcpu *vcpu) @@ -244,7 +244,7 @@ static inline bool kvm_check_has_quirk(struct kvm *kvm, u64 quirk) static inline bool kvm_vcpu_latch_init(struct kvm_vcpu *vcpu) { - return is_smm(vcpu) || kvm_x86_ops.apic_init_signal_blocked(vcpu); + return is_smm(vcpu) || static_call(kvm_x86_apic_init_signal_blocked)(vcpu); } void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip); |