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Re: [Qemu-devel] [PATCH v3 00/20] GICv3 emulation

From: Shannon Zhao
Subject: Re: [Qemu-devel] [PATCH v3 00/20] GICv3 emulation
Date: Wed, 22 Jun 2016 09:42:29 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

On 2016/6/22 3:53, Peter Maydell wrote:
> On 21 June 2016 at 20:45, Laszlo Ersek <address@hidden> wrote:
>> > On 06/21/16 19:21, Peter Maydell wrote:
>>> >> and add a note I forgot to mention: my primary hypothesis is that
>>> >> the problem here is "guest does not write to the GICD_IGROUPR and
>>> >> GICR_IGROUPR registers to program the interrupts it's using as
>>> >> group 1, but still expects to get IRQs rather than FIQs".
>> >
>> > ... and it (or whatever else is the root cause) seems to manifest in
>> > either the Stall() UEFI boot service, or in UEFI timer events. (This
>> > seems to follow from the last debug log entry from Shannon:
>> >
>> > [Bds]BdsWait(3)..Zzzz...
>> > )
>> >
>> > ... Just to make it clear: does it reproduce with KVM? Or is that
>> > untested perhaps (due to lack of GICv3 hardware e.g.)?
> Upthread Shannon said it worked with KVM enabled. Note that
> KVM's GICv3 emulation is incorrect in that it does not support
> interrupt groups, so all interrupt groups are Group 1 and
> generate IRQ even if the guest doesn't do anything to
> configure them.
It does work with KVM enabled. It also works with UEFI and the upstream
linux kernel while it doesn't work with UEFI and a FreeBSD guest since
the FreeBSD doesn't correctly set the IGROUPR, I think.

I can't find the commit ID of the UEFI I use but I used the upsream
codes of June 15.
Andrew, I suggest you use the QEMU mainline which includes the GICv3
emulation and the guest kernel with the commit 7c9b973061.


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