On 10/20/2015 09:43 AM, Jan Beulich wrote:
On 20.10.15 at 15:22, <boris.ostrov...@oracle.com> wrote:
The reason I think its this commit is that RAX, RDX and RCX look very
much like arguments to xsetbv (which xstate_enable_boot_cpu() executes)
and RAX value is 0x1f, which has two new bits that this commit defined.
That would be the two MPX related bits, yet us (luckily) white listing
leaf 7 in pv_cpuid(), it is quite easy to validate that we don't expose
this feature to PV(H) guests.
Oh, so something like
cpuid=['0x7:ebx=xxxxxxxxxxxxxxxxx0xxxxxxxxxxxxxx']
(bit 14 as zero) for John to try then.
-boris
Sadly the story is different for HVM
guests (where the leaf handling uses black listing), but the register
dump here clearly points to a PV guest (or Dom0).
Jan
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