Re: [Xen-devel] [PATCH v2] AMD/intremap: Prevent use of per-device vector maps until irq logic is fixed

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.06.13 at 17:17, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> On 03/06/13 16:01, Jan Beulich wrote:
>>>>> On 03.06.13 at 16:35, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>>> As I said, this reverts to the behaviour before XSA-36, but without the
>>> security issue of a single IOMMU interrupt remapping table.  Before
>>> XSA-36, all AMD systems were limited in vector range because of the
>>> global used_vector map.
>> Right, so you'd trade one regression for another (less severe, but
>> anyway).
> 
> Absolutely, especially when it comes to trying to fix a regression we
> have pushed out in a security fix.
> 
> Ideally a proper fix to MSI-X issue can be found, but failing a timely
> fix, reverting to the pre XSA-36 behaviour but without the security
> issue is a good solution.

Just to repeat - "can be found" is the wrong term, as we already
have a patch pending that - from all I can tell - would take care of
the problem (and you not stating anything to the contrary makes
me assume you agree).

Jan


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