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KVM: x86: Use static_call() for .vcpu_deliver_sipi_vector()

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Define and use a static_call() for kvm_x86_ops.vcpu_deliver_sipi_vector(),
mostly so that the op is defined in kvm-x86-ops.h.  This will allow using
KVM_X86_OP in vendor code to wire up the implementation.  Any performance
gains eeked out by using static_call() is a happy bonus and not the
primary motiviation.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220128005208.4008533-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-01-28 00:51:51 +00:00 committed by Paolo Bonzini
parent ef2d488c65
commit a0941a64a9
2 changed files with 2 additions and 1 deletions
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1
arch/x86/include/asm/kvm-x86-ops.h
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@ -122,6 +122,7 @@ KVM_X86_OP_NULL(enable_direct_tlbflush)
KVM_X86_OP_NULL(migrate_timers) KVM_X86_OP_NULL(migrate_timers)
KVM_X86_OP(msr_filter_changed) KVM_X86_OP(msr_filter_changed)
KVM_X86_OP_NULL(complete_emulated_msr) KVM_X86_OP_NULL(complete_emulated_msr)
KVM_X86_OP(vcpu_deliver_sipi_vector)
#undef KVM_X86_OP #undef KVM_X86_OP
#undef KVM_X86_OP_NULL #undef KVM_X86_OP_NULL

2
arch/x86/kvm/lapic.c
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@ -2933,7 +2933,7 @@ int kvm_apic_accept_events(struct kvm_vcpu *vcpu)
/* evaluate pending_events before reading the vector */ /* evaluate pending_events before reading the vector */
smp_rmb(); smp_rmb();
sipi_vector = apic->sipi_vector; sipi_vector = apic->sipi_vector;
kvm_x86_ops.vcpu_deliver_sipi_vector(vcpu, sipi_vector); static_call(kvm_x86_vcpu_deliver_sipi_vector)(vcpu, sipi_vector);
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
} }
} }