Re: [Xen-devel] [PATCH 0/2] x86/HVM: XSA-267 follow-ups

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.06.18 at 11:27, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 15/06/18 09:47, Jan Beulich wrote:
>> As both XenRT and osstest have found, the XSA-267 patches overlooked a
>> special case in HVM insn emulation. While looking into this I've also 
> noticed
>> an omission in the sibling function to the one needing to be changed. At
>> least patch 1 should be strongly considered for 4.11; patch 2 will need
>> backporting as well, but doesn't look as urgent.
>>
>> 1: account for fully eager FPU mode in emulation
>> 2: attempts to emulate FPU insns need to set fpu_initialised
> 
> Both Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> 
> At this point, I'm tempted to suggest that we reissue the XSA-267
> advisory to include patch 1.

Yes, I think we should do this. But let me first see how far this change
is needed, and whether on older versions nothing else is needed in its
stead.

Jan



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