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

[Tim Deegan <tim@xxxxxxx>]

At 13:09 +0000 on 11 Dec (1418299748), Jan Beulich wrote:
> >>> 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.

Thanks.  So to make this work for PVH we'd want to do something like
calling async_exception_cleanup() from vlapic_EOI_set()?

Tim.

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