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Re: [Xen-devel] VPMU backports for 4.6

On 01/20/2016 12:13 PM, Jan Beulich wrote:
On 20.01.16 at 17:12, <boris.ostrovsky@xxxxxxxxxx> 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?)


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