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Re: [Xen-users] xen domU segfaults with xpti on intel based systems


  • To: Andy Smith <andy@xxxxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxxx, Tomas Mozes <hydrapolic@xxxxxxxxx>
  • From: Juergen Gross <jgross@xxxxxxxx>
  • Date: Tue, 5 Mar 2019 14:18:23 +0100
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  • Delivery-date: Tue, 05 Mar 2019 13:19:20 +0000
  • List-id: Xen user discussion <xen-users.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 11/01/2019 17:52, Andy Smith wrote:
> Hi Juergen, Tomas,
> 
> On Fri, Jan 11, 2019 at 09:21:09AM +0100, Juergen Gross wrote:
>> On 11/01/2019 07:05, Tomas Mozes wrote:
>>> Some of the affected systems are Debian 8/9 (Debian 10 with kernel 4.18
>>> seems to work fine) and NetBSD 7. It's harder to reproduce the segfaults
>>> on Debian, but on NetBSD it's almost instant.
>>
>> Hmm, as we haven't received any similar reports, I suspect there is
>> something special on your side.
> 
> I did report slightly similar problems to xen-devel:
> 
>     https://lists.xenproject.org/archives/html/xen-devel/2018-11/msg02811.html
> 
> I currently work around it by ensuring the guests have updated their
> kernels to have the L1TF mitigations (you can tell because
> /sys/devices/system/cpu/vulnerabilities/l1tf appears).
> 
> The other way was to set the Xen command line options pv-l1tf=false
> or pcid=0.
> 
> For me this only affected 64-bit PV domains, but I only run Linux. I
> didn't try xpti=false because the logs about shadowing made me try
> the L1TF-related options first.

This is XSA-294. A patch has just been committed to Xen staging, patches
for older Xen releases will follow soon.


Juergen

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