linux-kernel - [PATCH 0/2] nVMX: Ensure host's PAT stays sane

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Message-ID: <20240605224527.2907272-1-seanjc@google.com>
Date: Wed,  5 Jun 2024 15:45:25 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-kernel@...r.kernel.org, Xiangfei Ma <xiangfeix.ma@...el.com>, 
	Yan Zhao <yan.y.zhao@...el.com>, Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH 0/2] nVMX: Ensure host's PAT stays sane

Fix a bug(s) where test_load_host_pat clobbers PAT and causes all
subsequent tests to effectively run with all memory mapped as UC.  Xiangfei
first noticed that this caused rdtsc_vmexit_diff_test to fail, but it can
also lead to timeouts if more tests are added, i.e. if more stuff runs after
test_load_host_pat.

Sean Christopherson (2):
  nVMX: Ensure host's PAT is loaded at the end of all VMX tests
  nVMX: Verify KVM actually loads the value in HOST_PAT into the PAT MSR

 x86/vmx.c       |  4 +++-
 x86/vmx_tests.c | 10 +++++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)


base-commit: 765b349b6c4b1c06473dfea548a15f799e0fbc2b
-- 
2.45.1.467.gbab1589fc0-goog