linux-kernel - Re: [Xen-devel] PROBLEM: kernel panic xsave

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Date:	Mon, 19 Oct 2015 12:25:23 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	John Doe <securef33d@...il.com>, Ingo Molnar <mingo@...nel.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xen.org, Jan Beulich <jbeulich@...e.com>
Subject: Re: [Xen-devel] PROBLEM: kernel panic xsave_init

On 10/19/2015 06:16 AM, John Doe wrote:
>>> [    0.000000] general protection fault: 0000 [#1] SMP
>>> [    0.000000] Modules linked in:
>>> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.1.9-6.pvops.qubes.x86_64 #1
>>> [    0.000000] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z170 Extreme4, BIOS P1.80 09/18/2015
>>> [    0.000000] task: ffffffff81c154c0 ti: ffffffff81c00000 task.ti: ffffffff81c00000
>>> [    0.000000] RIP: e030:[<ffffffff81d58fad>]  [<ffffffff81d58fad>] xstate_enable_boot_cpu+0xde/0x288
>>> [    0.000000] RSP: e02b:ffffffff81c03de8  EFLAGS: 00010046
>>> [    0.000000] RAX: 000000000000001f RBX: 0000000000000008 RCX: 0000000000000000
>>> [    0.000000] RDX: 0000000000000000 RSI: 000000000000001f RDI: 0000000000042660


It would be good to see what's at ffffffff81d58fad. My guess would be 
that it's xsetbv.

If it is then you probably want to make sure you are running hypervisor 
that has commit e8121c54 ("x86/xsave: enable support for new ISA 
extensions"). Looks like the first version that has it is 4.5 and you 
seem to be running 4.4.2.

Copying Jan to see if there are plans to backport this (probably not 
since it's a new feature).

-boris



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