Subject: Re: Dealing with the NMI mess
To: Andy Lutomirski <luto@amacapital.net>, Borislav Petkov <bp@alien8.de>
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Cc: Peter Zijlstra <peterz@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Willy Tarreau <w@1wt.eu>, Steven Rostedt <rostedt@goodmis.org>,
        X86 ML <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Brian Gerst <brgerst@gmail.com>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <55BB28EE.9040804@redhat.com>
Date: Fri, 31 Jul 2015 09:51:10 +0200
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On 31/07/2015 07:11, Andy Lutomirski wrote:
> This instruction is awesome.  Binutils can disassemble it (it's called
> "icebp") but it can't assemble it.  KVM has special handling for it on
> VMX and actually reports it to QEMU on SVM (complete with a defined
> ABI).

FWIW it's not reported to QEMU, it's only reported to a nested
hypervisor.  So the ABI is simply the SVM spec.

It's not surprising that VMX support was provided by the Wine guys...

Paolo

> We have an asm macro so we can assemble it for 32-bit but not
> 64-bit, despite the fact that it works on 64-bit.
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