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

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Message-ID: <ZmDuuRTkG2Y1LcTR@google.com>
Date: Wed, 5 Jun 2024 16:03:21 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org, 
	Xiangfei Ma <xiangfeix.ma@...el.com>, Yan Zhao <yan.y.zhao@...el.com>
Subject: Re: [PATCH 0/2] nVMX: Ensure host's PAT stays sane

On Wed, Jun 05, 2024, Sean Christopherson wrote:
> 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(-)

Doh, this is for kvm-unit-tests.  Been a while since I sent KUT patches...