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

[Andrew Jones]

On Wed, Jun 22, 2016 at 09:42:29AM +0800, Shannon Zhao wrote:
> 
> 
> 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.

Doesn't appear to be FreeBSD specific, as I'm using a Linux kernel and
can reproduce. Besides, it doesn't even make it to grub.

> 
> 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.

Yeah, I hadn't noticed that gicv3 made it to mainline. I've switched
to that now. My guest kernel does have 7c9b973061 (I backported it to
the RHELSA kernel)

My complete AAVMF.verbose log is here
https://paste.fedoraproject.org/383004/46658133/

Thanks,
drew