linux-kernel - [PATCH 0/3] KVM: nSVM: Stop tracking EFER.SVME in guest mode

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Message-ID: <20260130020735.2517101-1-yosry.ahmed@linux.dev>
Date: Fri, 30 Jan 2026 02:07:32 +0000
From: Yosry Ahmed <yosry.ahmed@...ux.dev>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: [PATCH 0/3] KVM: nSVM: Stop tracking EFER.SVME in guest mode

Fix a bug (although not architecturally a bug) where KVM leaves guest
mode and tears nested state if L2 clears EFER.SVME and L1 does not
intercept it.

Yosry Ahmed (3):
  KVM: SVM: Refactor EFER.SVME switching logic out of svm_set_efer()
  KVM: nSVM: Do not track EFER.SVME toggling in guest mode
  KVM: selftests: Add a test for L2 toggling EFER.SVME

 arch/x86/kvm/svm/svm.c                        | 79 ++++++++++++-------
 tools/testing/selftests/kvm/Makefile.kvm      |  1 +
 .../kvm/x86/svm_nested_toggle_efer_svme.c     | 76 ++++++++++++++++++
 3 files changed, 126 insertions(+), 30 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86/svm_nested_toggle_efer_svme.c


base-commit: 1a424e9e0616db91010f08e5985bcc6edc504205
-- 
2.53.0.rc1.225.gd81095ad13-goog