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Re: [Xen-devel] Dom0 Failing to Boot with Recent Linux Kernels (Spectre Mitigations)
- To: Brian Woods <brian.woods@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 21 Jun 2018 01:55:54 +0800
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx
- Delivery-date: Wed, 20 Jun 2018 17:56:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 21/06/18 01:20, Brian Woods wrote:
> On Wed, Jun 20, 2018 at 08:34:13AM +0200, Juergen Gross wrote:
>> Brian, would you please give the attached patch a try?
>>
>>
>> Juergen
> Juergen,
>
> It works for Dom0. You see a lot of messages that are like:
> (XEN) emul-priv-op.c:1166:d0v1 Domain attempted WRMSR c0011020 from
> 0x0206800000000000 to 0x0206800000000400
> (XEN) emul-priv-op.c:1166:d0v0 Domain attempted WRMSR c0011020 from
> 0x0206800000000000 to 0x0206800000000400
That is Linux trying to enable the SSBD via the native mechanism (on
Fam17h hardware I'm guessing, give the bit position).
Like many of the other mitigations, a PV guest knows it is virtualised
and shouldn’t be playing with this MSR.
OTOH, Xen should be implementing the AMD SSBD spec and allowing for
virtualised control of SSBD. Sadly, I was only show the whitepaper with
insufficient time before the SSBD embargo to implement it in XSA-263,
and haven't had time since.
~Andrew
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