From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
luferry <luferry@163.com>
Subject: [PATCH 0/2] KVM: VMX: Avoid RDMSRs in PI x2APIC checks
Date: Fri, 15 Jan 2021 14:03:52 -0800 [thread overview]
Message-ID: <20210115220354.434807-1-seanjc@google.com> (raw)
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.
[*] https://lkml.kernel.org/r/20190723130608.26528-1-luferry@163.com/
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(-)
--
2.30.0.284.gd98b1dd5eaa7-goog
next reply other threads:[~2021-01-15 22:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-15 22:03 Sean Christopherson [this message]
2021-01-15 22:03 ` [PATCH 1/2] x86/apic: Export x2apic_mode for use by KVM in "warm" path Sean Christopherson
2021-01-15 22:03 ` [PATCH 2/2] KVM: VMX: Use x2apic_mode to avoid RDMSR when querying PI state Sean Christopherson
2021-01-18 18:24 ` [PATCH 0/2] KVM: VMX: Avoid RDMSRs in PI x2APIC checks Paolo Bonzini
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