On 01/20/2016 12:13 PM, Jan Beulich wrote:
On 20.01.16 at 17:12, <boris.ostrov...@oracle.com> wrote:
There two patches need to be backported to 4.6
fb424bf x86/VPMU: don't allow any non-zero writes to MSR_IA32_PEBS_ENABLE
31af0d7 x86/VPMU: check more carefully which bits are allowed to be
written to MSRs
"Need to be" is pretty strong for an unsupported subsystem. In fact
I had already considered those and then decided not to take them.
So with you asking for them I'm not really sure what to do...
"Need to" may indeed have been a bit too much.
Since there is a potential for crashing the hypervisor I think we should
have those two in 4.6, even if we don't officially support VPMU.
(As a side --- XSA-163 says that VPMU is "unsupported security-wise". Do
we make any distinction between a feature being generally or
security-wise unsupported?)
-boris
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