linux-kernel - [PATCH v4 0/7] KVM: SVM: Enable AVIC for Zen4+ (if x2AVIC)

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Message-ID: <20250919215934.1590410-1-seanjc@google.com>
Date: Fri, 19 Sep 2025 14:59:27 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Naveen N Rao <naveen@...nel.org>
Subject: [PATCH v4 0/7] 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).

v4:
 - Collect tags. [Naveen]
 - Add missing "(AMD)" for Naveen's attribution. [Naveen]
 - Make svm_x86_ops globally visible, to match TDX, instead of passing in
   the struct as parameter to avic_hardware_setup(). [Naveen]
 - s/avic_want_avic_enabled/avic_want_enabled. [Naveen]
 - Print "AVIC enabled" in avic_harware_setup() so that it's close to the
   "x2AVIC enabled" message. [Naveen]

v3: https://lore.kernel.org/all/owztdzclln5pmgsuxgzt54vneiejtngdkujaebr7r35zx3f4lj@xvvhwvumkkha
 - 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 (AMD) (1):
  KVM: SVM: Enable AVIC by default for Zen4+ if x2AVIC is support

Sean Christopherson (6):
  KVM: SVM: Make svm_x86_ops globally visible, clean up on-HyperV usage
  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         | 151 ++++++++++++++++++++++++++------
 arch/x86/kvm/svm/svm.c          |  64 +-------------
 arch/x86/kvm/svm/svm.h          |   6 +-
 arch/x86/kvm/svm/svm_onhyperv.c |  28 +++++-
 arch/x86/kvm/svm/svm_onhyperv.h |  31 +------
 5 files changed, 158 insertions(+), 122 deletions(-)


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