Re: [PATCH 0/2] KVM: VMX: Avoid RDMSRs in PI x2APIC checks

From: Paolo Bonzini
Date: Mon Jan 18 2021 - 13:27:06 EST

On 15/01/21 23:03, Sean Christopherson wrote:
Resurrect a patch[*] from over a year ago to avoid RDMSR in a fairly hot
path in KVM's posted interrupt support. Note, in my response to that
patch, I suggested checking x2apic_supported() as well as x2apic_mode. I
have no idea why I suggested that; unless I'm missing something,
x2apic_mode can never be set if x2apic_supported() is false.


Sean Christopherson (2):
x86/apic: Export x2apic_mode for use by KVM in "warm" path
KVM: VMX: Use x2apic_mode to avoid RDMSR when querying PI state

arch/x86/kernel/apic/apic.c | 1 +
arch/x86/kvm/vmx/posted_intr.c | 6 +++---
2 files changed, 4 insertions(+), 3 deletions(-)

Queued, thanks.