linux-kernel - [PATCH 0/2] KVM: x86: Fix dirty logging of emulated atomics

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Message-ID: <20240215010004.1456078-1-seanjc@google.com>
Date: Wed, 14 Feb 2024 17:00:02 -0800
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, 
	David Matlack <dmatlack@...gle.com>, Pasha Tatashin <tatashin@...gle.com>, 
	Michael Krebs <mkrebs@...gle.com>
Subject: [PATCH 0/2] KVM: x86: Fix dirty logging of emulated atomics

Fix a bug in KVM's emulator where the target page of an atomic write isn't
marked dirty, and enhance the dirty_log_test selftest to serve as
a regression test by conditionally doing forced emulation of guest writes.

Note, the selftest depends on several patches that are sitting in
`kvm-x86 pmu`, so I'll likely take the selftest through that branch (eww).

Sean Christopherson (2):
  KVM: x86: Mark target gfn of emulated atomic instruction as dirty
  KVM: selftests: Test forced instruction emulation in dirty log test
    (x86 only)

 arch/x86/kvm/x86.c                           | 10 ++++++
 tools/testing/selftests/kvm/dirty_log_test.c | 36 ++++++++++++++++++--
 2 files changed, 43 insertions(+), 3 deletions(-)


base-commit: 7455665a3521aa7b56245c0a2810f748adc5fdd4
-- 
2.43.0.687.g38aa6559b0-goog