linux-kernel - Re: [PATCH v7 03/10] KVM: x86: Stuff vCPU's PAT with default value at RESET, not creation

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Message-ID: <CALMp9eS9Nani-jzjQjfWyMS+gQTrH6XHn588EMpCPQoug-Gaww@mail.gmail.com>
Date: Mon, 20 May 2024 11:01:41 -0700
From: Jim Mattson <jmattson@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Xiaoyao Li <xiaoyao.li@...el.com>, Kai Huang <kai.huang@...el.com>, 
	Shan Kang <shan.kang@...el.com>, Xin Li <xin3.li@...el.com>, Zhao Liu <zhao1.liu@...el.com>
Subject: Re: [PATCH v7 03/10] KVM: x86: Stuff vCPU's PAT with default value at
 RESET, not creation

On Mon, May 20, 2024 at 11:00 AM Sean Christopherson <seanjc@...glecom> wrote:
>
> Move the stuffing of the vCPU's PAT to the architectural "default" value
> from kvm_arch_vcpu_create() to kvm_vcpu_reset(), guarded by !init_event,
> to better capture that the default value is the value "Following Power-up
> or Reset".  E.g. setting PAT only during creation would break if KVM were
> to expose a RESET ioctl() to userspace (which is unlikely, but that's not
> a good reason to have unintuitive code).
>
> No functional change.
>
> Reviewed-by: Xiaoyao Li <xiaoyao.li@...el.com>
> Reviewed-by: Kai Huang <kai.huang@...el.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>