linux-kernel - Re: [PATCH v11 0/9] Introduce support for guest CET feature

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Message-ID: <20200424133406.GB24039@local-michael-cet-test>
Date:   Fri, 24 Apr 2020 21:34:06 +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
Subject: Re: [PATCH v11 0/9] Introduce support for guest CET feature

On Thu, Apr 23, 2020 at 09:03:14AM -0700, Sean Christopherson wrote:
> On Thu, Mar 26, 2020 at 04:18:37PM +0800, Yang Weijiang wrote:
> > Control-flow Enforcement Technology (CET) provides protection against
> > Return/Jump-Oriented Programming (ROP/JOP) attack. It includes two
> > sub-features: Shadow Stack (SHSTK) and Indirect Branch Tracking (IBT).
> > 
> > KVM needs to update to enable guest CET feature.
> > This patchset implements CET related CPUID/XSAVES enumeration, MSRs
> > and vmentry/vmexit configuration etc.so that guest kernel can setup CET
> > runtime infrastructure based on them. Some CET MSRs and related feature
> > flags used reference the definitions in kernel patchset.
> > 
> > CET kernel patches are here:
> > https://lkml.org/lkml/2020/2/5/593
> > https://lkml.org/lkml/2020/2/5/604
> 
> ...
> 
> > - This patch serial is built on top of below branch and CET kernel patches
> >   for seeking xsaves support:
> >   https://git.kernel.org/pub/scm/virt/kvm/kvm.git/log/?h=cpu-caps
> 
> Can you provide the full code in a branch/tag somewhere?  The CET patches
> are in turn dependent on XSAVES enabling[*], and those don't apply cleanly
> on the cpu-caps branch.
> 
> It might make sense to also rebase to kvm/queue?  Though that's not a
> requirement by any means, e.g. don't bother if the CET patches are going to
> be respun soon.
>
I'll rebase the patches to 5.7-rc2, so things will be clear then.

> https://lkml.kernel.org/r/20200328164307.17497-1-yu-cheng.yu@intel.com