linux-kernel - Re: Dealing with the NMI mess

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Message-ID: <55BB28EE.9040804@redhat.com>
Date:	Fri, 31 Jul 2015 09:51:10 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...en8.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Willy Tarreau <w@....eu>, Steven Rostedt <rostedt@...dmis.org>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Brian Gerst <brgerst@...il.com>
Subject: Re: Dealing with the NMI mess



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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