linux-kernel - Re: [PATCH] Fix when booting Xen+Linux under QEMU.

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Message-ID: <4D01462A.4010808@goop.org>
Date:	Thu, 09 Dec 2010 13:12:10 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	linux-kernel@...r.kernel.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	xen-devel@...ts.xensource.com,
	Konrad Rzeszutek Wilk <konrad@...nel.org>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: Re: [PATCH] Fix when booting Xen+Linux under QEMU.

On 12/09/2010 01:01 PM, Konrad Rzeszutek Wilk wrote:
> Please take a look. The first patch just cleans up the find_unbound_irq
> so it is easier to understand what it does.
>
> The second patch hardness the Xen IRQ (event channels) allocation finder
> if you try to boot a minimalistic 32-bit Linux kernel along with a
> Xen hypervisor under QEMU.
>
> We end up with a weird scenario where the nr_irq_gsi was greater than nr_irq
> by 16. This code hardness it by pointing out the issue to the user and tries
> to continue - BUT this might impact the PCI device allocation.
>
> Tested also on normal machine with no regressions found.

I think I'd prefer to:

   1. move to using all dynamic irqs, and use the core kernel irq
      allocator (ie, resurrect IanC's patches)
   2. kill the ioapic dummy page hack (I'm assuming that would be
      trivial - at least to make it all zero - because the kernel won't
      care about the number of GSIs at that point)

    J
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