linux-kernel - [PATCH 0/3] KVM: x86: Accelerate reading CR3 for guest debug

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Message-ID: <20251121193204.952988-1-yosry.ahmed@linux.dev>
Date: Fri, 21 Nov 2025 19:32:01 +0000
From: Yosry Ahmed <yosry.ahmed@...ux.dev>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	Ken Hofsass <hofsass@...gle.com>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: [PATCH 0/3] KVM: x86: Accelerate reading CR3 for guest debug

Some guest debuggers use the value of CR3 to attribute a debug event to
a guest process. Providing CR3 in the debug info makes this
significantly faster than doing KVM_GET_SREGS every time, so add support
for that. Also extend the debug_regs selftest to cover this.

Yosry Ahmed (3):
  KVM: x86: Add CR3 to guest debug info
  KVM: selftests: Use TEST_ASSERT_EQ() in debug_regs
  KVM: selftests: Verify CR3 in debug_regs

 arch/x86/include/uapi/asm/kvm.h              |  1 +
 arch/x86/kvm/svm/svm.c                       |  2 +
 arch/x86/kvm/vmx/vmx.c                       |  2 +
 arch/x86/kvm/x86.c                           |  3 +
 include/uapi/linux/kvm.h                     |  1 +
 tools/testing/selftests/kvm/x86/debug_regs.c | 82 ++++++++++----------
 6 files changed, 48 insertions(+), 43 deletions(-)


base-commit: d209f1ea367750edfcba7db8d199a856e4186511
-- 
2.52.0.rc2.455.g230fcf2819-goog