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Re: [Qemu-devel] [PATCH 00/23] GICv3 emulation

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 00/23] GICv3 emulation
Date: Thu, 12 May 2016 16:22:40 +0100

On 12 May 2016 at 16:01, Shannon Zhao <address@hidden> wrote:
> On 2016年05月12日 22:35, Peter Maydell wrote:
>> Can you put the Image file somewhere I can download it, please?
> I just upload it to
> http://people.linaro.org/~shannon.zhao/ACPI_ARM/Image

OK, I can reproduce with that, and I think I know what this is.
If we boot a "-bios" image then we don't apply the QEMU workaround
for booting buggy Linux images which puts all the interrupts into
Group 1, and it looks like a no-TZ-support UEFI doesn't
configure the interrupt groups either. So Linux ends up hanging
because the interrupt is group 0 but group 0 is disabled.

If you apply this patch to your guest kernel you should find
it boots OK I think:

(I'm not sure why the images I was running worked OK; I must
have been testing with an image that had that bugfix in it,
though I could have sworn I wasn't.)

I don't really want to apply the QEMU workaround when we're
booting firmware images as well as raw kernels, but on the
other hand via-UEFI is kind of supposed to be the normal way
to boot in future. Perhaps we should drop the QEMU workaround
altogether, putting everybody on the same playing field...

-- PMM

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