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Re: [Xen-devel] HVM Migration of domU on Qemu-upstream DM causes stuck system clock with ACPI


--On 31 May 2013 17:30:41 -0400 Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:

VIRQ_TIMER not being delievered. Aka this commit

xen/events: Handle VIRQ_TIMER before any other hardirq in event loop.

should be back-ported but didn't yet. Let me put that
on my TODO list.

Last time I played seriously with x86 interrupts was with real hardware
circa 23 years ago, so feel free to say this is a stupid idea, but assuming
the interrupts are level triggered, would it be possible for Xen to delay
delivery of any hard irqs until the first timer irq has been handled
after a migration? And/or accelerate delivery of a timer IRQ?

I'm still hoping for a workaround that doesn't involve patching every
guest OS.

Alex Bligh

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