Re: [Qemu-devel] [Qemu-arm] [PATCH 0/2] GICv2 & GICv3: RAZ/WI reserved addresses rather than aborting

[Laszlo Ersek <lersek@redhat.com>]

On 01/09/18 17:12, Peter Maydell wrote:
> On 9 January 2018 at 15:58, Laszlo Ersek <lersek@redhat.com> wrote:
>> Sorry, no clue about any of this -- where should I read up?
> 
> I cc'd you mostly as a heads-up since the QEMU bug is UEFI affecting,
> not because I wanted to make you read the GIC specs :-)

Thanks (and, thanks :) ) -- from patch #2, looks like GICv2 is affected
too, and the patch seems to be fixing commit a9d853533cc1
("hw/intc/arm_gic: Switch to read/write callbacks with tx attributes",
2015-05-12).

Is that right? That commit was released with v2.4.0. Should I have
experienced the error? Is it KVM / hardware specific? What are the symptoms?

>> Ard did ask a question though:
>>
>> https://www.mail-archive.com/qemu-devel@nongnu.org/msg500055.html
> 
> Sounds plausible (my UEFI binary I hit this with is pretty ancient)
> but I don't know for certain. It's one of those things that seems
> like it's a bug in UEFI (perhaps now fixed) but which is also
> definitely a bug in QEMU, and if it is a UEFI bug it's pretty
> harmless.

... I don't know the symptoms of the issue either that was fixed by
<https://github.com/tianocore/edk2/commit/28f8d28faabf50a82ef8d137308592c64ea9e2b6>.
Guest crashes with unhandled data abort? (I.e., impossible not to notice.)

Thanks!
Laszlo