linux-kernel - Re: [PATCH 00/19] Refresh queued CET virtualization series

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Message-ID: <YtGOmEeMW1BbC3Ne@google.com>
Date:   Fri, 15 Jul 2022 15:58:16 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     "Yang, Weijiang" <weijiang.yang@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        rick.p.edgecombe@...el.com
Subject: Re: [PATCH 00/19] Refresh queued CET virtualization series

On Fri, Jul 15, 2022, Yang, Weijiang wrote:
> 
> On 7/15/2022 3:36 AM, Sean Christopherson wrote:
> > It's definitely uncommon; unless I'm forgetting features, LA57 is the only feature
> > that KVM fully virtualizes (as opposed to emulates in software) without requiring
> > host enablement.  Ah, and good ol' MPX, which is probably the best prior are since
> > it shares the same XSAVE+VMCS for user+supervisor state management.  So more than
> > one, but still not very many.
> 
> Speaking of MPX, is it really active in recent kernel? I can find little
> piece of code at native side, instead, more code in KVM.

Nope, native MPX support was ripped out a year or two ago.  The kernel provides
just enough save+restore support so that KVM can continue to virtualize MPX.