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

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Date:   Thu, 23 Apr 2020 09:03:14 -0700
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
Subject: Re: [PATCH v11 0/9] Introduce support for guest CET feature

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.

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