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From: Peter Maydell <peter.maydell@linaro.org>
Date: Wed, 15 Nov 2017 11:57:40 +0000
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Subject: Re: [Qemu-devel] [PATCH for-2.11] target/arm: Report GICv3 sysregs
 present in ID registers if needed
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To: Alistair Francis <alistair23@gmail.com>
Cc: qemu-arm <qemu-arm@nongnu.org>, "qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>, Stefano Stabellini <sstabellini@kernel.org>, Patch Tracking <patches@linaro.org>

On 15 November 2017 at 01:14, Alistair Francis <alistair23@gmail.com> wrote:
> On Tue, Nov 7, 2017 at 7:01 AM, Peter Maydell <peter.maydell@linaro.org> wrote:
>> The CPU ID registers ID_AA64PFR0_EL1, ID_PFR1_EL1 and ID_PFR1
>> have a field for reporting presence of GICv3 system registers.
>> We need to report this field correctly in order for Xen to
>> work as a guest inside QEMU emulation. We mustn't incorrectly
>> claim the sysregs exist when they don't, though, or Linux will
>> crash.
>>
>> Unfortunately the way we've designed the GICv3 emulation in QEMU
>> puts the system registers as part of the GICv3 device, which
>> may be created after the CPU proper has been realized. This
>> means that we don't know at the point when we define the ID
>> registers what the correct value is. Handle this by switching
>> them to calling a function at runtime to read the value, where
>> we can fill in the GIC field appropriately.
>>
>> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
>
> Is this going to make it into 2.11?

Yes, it's supposed to go into 2.11 -- I think I just forgot
to put it in the rc1 pullreq, but it'll go in rc2.

thanks
-- PMM