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Re: [Qemu-devel] [RFC PATCH 22/34] i386: Hyper-V VMBus ACPI DSDT entry

From: Roman Kagan
Subject: Re: [Qemu-devel] [RFC PATCH 22/34] i386: Hyper-V VMBus ACPI DSDT entry
Date: Wed, 7 Feb 2018 22:37:27 +0300
User-agent: Mutt/1.9.2 (2017-12-15)

On Wed, Feb 07, 2018 at 12:05:23PM +0100, Paolo Bonzini wrote:
> On 06/02/2018 21:30, Roman Kagan wrote:
> > From: Andrey Smetanin <address@hidden>
> > 
> > Guest OS uses ACPI to discover vmbus presence.  Add a corresponding
> > entry to DSDT in case vmbus has been enabled.
> > 
> > Experimentally Windows guests were found to require this entry to
> > include two IRQ resources, so this patch adds two semi-arbitrarily
> > chosen ones (7 and 13).  This results, in particular, in parallel port
> > conflicting with vmbus.
> > 
> > TODO: discover and use spare IRQs to avoid conflicts.
> Could they be level-triggered IRQs?

Dunno, I'll have to experiment.  There appears to be no *use* for them,
only their presence seems to matter.

> If so you could reuse 10 and 11
> which are used by PCI INTx.  Otherwise, the parallel port conflict is
> not a huge deal.
> > Signed-off-by: Evgeny Yakovlev <address@hidden>
> Somewhat messy SoB chain. :)

Yes that happens when the patches circulate within the team before being
posted outside.  Will fix when submitting.


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