linux-kernel - [PATCH v3 0/6] KVM: SVM: Enable AVIC for Zen4+ (if x2AVIC)

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Message-ID: <20250919002136.1349663-1-seanjc@google.com>
Date: Thu, 18 Sep 2025 17:21:30 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Naveen N Rao <naveen@...nel.org>
Subject: [PATCH v3 0/6] KVM: SVM: Enable AVIC for Zen4+ (if x2AVIC)

Enable AVIC by default for Zen4+, so long as x2AVIC is supported (which should
be the case if AVIC is supported).

v3:
 - Don't advise the user to enable force_avic. [Naveen]
 - Gather AVIC related module params in avic.c (by moving code/helpers to
   avic.c).
 - Print "AVIC enabled" even when it's forced.
 - Enable by default iff x2AVIC is supported.
 - Use "auto" to select KVM's automatic/default behavior.

v2: https://lore.kernel.org/all/cover.1756993734.git.naveen@kernel.org

v1: http://lkml.kernel.org/r/20250626145122.2228258-1-naveen@kernel.org

Naveen N Rao (1):
  KVM: SVM: Enable AVIC by default for Zen4+ if x2AVIC is support

Sean Christopherson (5):
  KVM: SVM: Move x2AVIC MSR interception helper to avic.c
  KVM: SVM: Update "APICv in x2APIC without x2AVIC" in avic.c, not svm.c
  KVM: SVM: Always print "AVIC enabled" separately, even when force
    enabled
  KVM: SVM: Don't advise the user to do force_avic=y (when x2AVIC is
    detected)
  KVM: SVM: Move global "avic" variable to avic.c

 arch/x86/kvm/svm/avic.c | 149 +++++++++++++++++++++++++++++++++-------
 arch/x86/kvm/svm/svm.c  |  62 +----------------
 arch/x86/kvm/svm/svm.h  |   4 +-
 3 files changed, 125 insertions(+), 90 deletions(-)


base-commit: c8fbf7ceb2ae3f64b0c377c8c21f6df577a13eb4
-- 
2.51.0.470.ga7dc726c21-goog