Re: [Xen-devel] Dom0 Failing to Boot with Recent Linux Kernels (Spectre Mitigations)

[Brian Woods <brian.woods@xxxxxxx>]

On Thu, Jun 21, 2018 at 01:55:54AM +0800, Andrew Cooper wrote:
> 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

I'll take a look into updating it for AMD related processors then.  I
will talk with some people internally who did the work for Linux and
see what needs to be done etc.

-- 
Brian Woods

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