Re: [Xen-devel] [PATCH] x86: don't change affinity with interrupt unmasked

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.03.15 at 19:12, <andrew.cooper3@xxxxxxxxxx> wrote:
>> Changing the affinity of non-maskable MSI IRQs seems bogus too
> 
> Agreed.  Their affinity can clearly only be changed safely by a device 
> driver which can guarantee that an interrupt will not be generated 
> during the vulnerable period.
> 
> This further implies that Xen can't even safely set an affinity to start 
> with...

No, as long as MSI is disabled (i.e. during initial setup) this would be
fine. Disabling MSI could even be an option to do this, if there
weren't devices that misbehave when MSI gets disabled again after
having once been enabled.

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel