linux-kernel - Re: [PATCH] x86-64: espfix for 64-bit mode *PROTOTYPE*

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Message-ID: <5357F0A0.6040909@zytor.com>
Date:	Wed, 23 Apr 2014 09:56:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Andrew Lutomirski <amluto@...il.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Borislav Petkov <bp@...en8.de>,
	Arjan van de Ven <arjan.van.de.ven@...el.com>,
	Brian Gerst <brgerst@...il.com>,
	Alexandre Julliard <julliard@...ehq.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86-64: espfix for 64-bit mode *PROTOTYPE*

On 04/23/2014 07:24 AM, Boris Ostrovsky wrote:
>>
>> Konrad - I really could use some help figuring out what needs to be done
>> for this not to break Xen.
> 
> This does break Xen PV:
> 

I know it does.  This is why I asked for help.

This is fundamentally the problem with PV and *especially* the way Xen
PV was integrated into Linux: it acts as a development brake for native
hardware.  Fortunately, Konrad has been quite responsive to that kind of
problems, which hasn't always been true of the Xen community in the past.

	-hpa

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