linux-kernel - Re: [PATCH v8 4/7] KVM: VMX: Load CET states on vmentry/vmexit

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Message-ID: <20191218132014.GA7926@local-michael-cet-test>
Date:   Wed, 18 Dec 2019 21:20:14 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Yang Weijiang <weijiang.yang@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com,
        jmattson@...gle.com, yu.c.zhang@...ux.intel.com,
        yu-cheng.yu@...el.com
Subject: Re: [PATCH v8 4/7] KVM: VMX: Load CET states on vmentry/vmexit

On Tue, Dec 17, 2019 at 04:30:05PM -0800, Sean Christopherson wrote:
> On Thu, Dec 12, 2019 at 09:04:24AM +0800, Yang Weijiang wrote:
> > On Wed, Dec 11, 2019 at 08:35:10AM -0800, Sean Christopherson wrote:
> > > Have you tested SMM at all?  The interaction between CR0 and CR4 may be
> > > problematic for em_rsm() and/or rsm_enter_protected_mode().
> > >
> > Not yet, what's an easy way to test code in SMM mode?
> 
> IIRC, SeaBIOS does SMM stuff by default.
Thanks Sean. I'll check this part.