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

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Date: Wed, 12 Jun 2024 09:47:15 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: Sean Christopherson <seanjc@...gle.com>
CC: Paolo Bonzini <pbonzini@...hat.com>, <linux-kernel@...r.kernel.org>,
	Xiangfei Ma <xiangfeix.ma@...el.com>
Subject: Re: [PATCH 0/2] nVMX: Ensure host's PAT stays sane

On Tue, Jun 11, 2024 at 06:18:40PM -0700, Sean Christopherson wrote:
> On Wed, 05 Jun 2024 15:45:25 -0700, 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
> > 
> > [...]
> 
> Applied to kvm-x86 next, thanks!
> 
> [1/2] nVMX: Ensure host's PAT is loaded at the end of all VMX tests
>       https://github.com/kvm-x86/kvm-unit-tests/commit/8cbb8d3cbca9
This is also good, though I thought you would fix the theoretical one as
https://lore.kernel.org/all/ZmesywdpFG3qDIkZ@google.com/ :)

> [2/2] nVMX: Verify KVM actually loads the value in HOST_PAT into the PAT MSR
>       https://github.com/kvm-x86/kvm-unit-tests/commit/d31433807f2b
> 
> --
> https://github.com/kvm-x86/kvm-unit-tests/tree/next