linux-kernel - Re: Is espfix64's double-fault thing OK on Xen?

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Message-ID: <53C4AA97.2050105@zytor.com>
Date:	Mon, 14 Jul 2014 21:14:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Is espfix64's double-fault thing OK on Xen?

On 07/14/2014 07:46 PM, Andy Lutomirski wrote:
> 
> On espfix-less kernels (Xen and non-Xen), 16-bit CS w/ 16-bit SS
> always fails.  Native (32-bit or 64-bit, according to the binary) CS
> with 16-bit SS fails for sigreturn_32, but passes for sigreturn_64.  I
> find this somewhat odd.  Native ss always passes.
> 

espfix32 is disabled on Xen.

	-hpa

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