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

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Message-ID: <20191218003005.GO11771@linux.intel.com>
Date:   Tue, 17 Dec 2019 16:30:05 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Yang Weijiang <weijiang.yang@...el.com>
Cc:     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 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.