linux-kernel - Re: [PATCH] KVM: x86: emulate reserved nops from 0f/18 to 0f/1f

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Message-ID: <20200519153244.GB13603@linux.intel.com>
Date:   Tue, 19 May 2020 08:32:44 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: emulate reserved nops from 0f/18 to 0f/1f

On Tue, May 19, 2020 at 10:06:25AM +0200, Paolo Bonzini wrote:
> On 19/05/20 09:55, Sean Christopherson wrote:
> > Tangentially related, isn't the whole fastop thing doomed once CET kernel
> > support lands?
> 
> Why?  You do need to add endbr markers and some of the fastop handlers
> won't fit in 8 bytes, but that should be it.

Never mind, had a brain fart and forgot CALL_NOSPEC shouldn't get patched
to a retpoline on CET capable CPUs.