From 563c54c4d5b1230990e3b21ba5d29d79bd3e3b3d Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 15 Jan 2021 14:03:54 -0800 Subject: [PATCH] KVM: VMX: Use x2apic_mode to avoid RDMSR when querying PI state Use x2apic_mode instead of x2apic_enabled() when adjusting the destination ID during Posted Interrupt updates. This avoids the costly RDMSR that is hidden behind x2apic_enabled(). Reported-by: luferry Signed-off-by: Sean Christopherson Message-Id: <20210115220354.434807-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx/posted_intr.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/vmx/posted_intr.c b/arch/x86/kvm/vmx/posted_intr.c index f02962dcc72cb..4831bc44ce66f 100644 --- a/arch/x86/kvm/vmx/posted_intr.c +++ b/arch/x86/kvm/vmx/posted_intr.c @@ -54,7 +54,7 @@ void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu) dest = cpu_physical_id(cpu); - if (x2apic_enabled()) + if (x2apic_mode) new.ndst = dest; else new.ndst = (dest << 8) & 0xFF00; @@ -104,7 +104,7 @@ static void __pi_post_block(struct kvm_vcpu *vcpu) dest = cpu_physical_id(vcpu->cpu); - if (x2apic_enabled()) + if (x2apic_mode) new.ndst = dest; else new.ndst = (dest << 8) & 0xFF00; @@ -174,7 +174,7 @@ int pi_pre_block(struct kvm_vcpu *vcpu) */ dest = cpu_physical_id(vcpu->pre_pcpu); - if (x2apic_enabled()) + if (x2apic_mode) new.ndst = dest; else new.ndst = (dest << 8) & 0xFF00; -- 2.39.5