Re: [Xen-devel] [PATCH] x86: don't deliver NMI to PVH Dom0

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.12.14 at 14:00, <tim@xxxxxxx> wrote:
> At 10:47 +0000 on 11 Dec (1418291241), Jan Beulich wrote:
>> ... for the time being: The mechanism used depends on the domain's use
>> of the IRET hypercall.
> 
> Can you elaborate?  Looking at the existing code it seems like what it
> does is set v->nmi_pending and make sure the vcpu gets scheduled
> appropriately.
> 
> The HVM code will deliver an NMI if it sees v->nmi_pending (which is
> what vlapic_accept_irq does, for example).  Is there some other piece
> I'm missing?

Just so that others see the answer too: The problem is that the
temporary affinity adjustment gets undone in the HYPERVISOR_iret
handler, yet PVH can't call that hypercall.

Jan


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