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Re: [PATCH 13/13] microvm/acpi: use GSI 16-23 for virtio

From: Gerd Hoffmann
Subject: Re: [PATCH 13/13] microvm/acpi: use GSI 16-23 for virtio
Date: Mon, 23 Mar 2020 11:23:45 +0100

On Fri, Mar 20, 2020 at 11:30:16AM -0400, Konrad Rzeszutek Wilk wrote:
> On Thu, Mar 19, 2020 at 09:01:17AM +0100, Gerd Hoffmann wrote:
> > With ACPI enabled and IO-APIC being properly declared in the ACPI tables
> > we can use interrupt lines 16-23 for virtio and avoid shared interrupts.
> 7 interrupt lines? Is there a specific requirements of which
> ones should be assigned to what device?

8 lines (23 is inclusive), one for each virtio device.  It wouldn't give
you separate config change or per-queue interrupts (I think virtio-mmio
doesn't support that).  It only avoids sharing interrupts with legacy
pc devices like rtc and acpi.


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