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Re: [Qemu-devel] [PATCH for-2.11] target/arm: Report GICv3 sysregs prese

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH for-2.11] target/arm: Report GICv3 sysregs present in ID registers if needed
Date: Wed, 15 Nov 2017 11:57:40 +0000

On 15 November 2017 at 01:14, Alistair Francis <address@hidden> wrote:
> On Tue, Nov 7, 2017 at 7:01 AM, Peter Maydell <address@hidden> 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 <address@hidden>
> 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.

-- PMM

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