Re: kvm-unit-tests gicv2 cases fail

[Marc Zyngier <marc.zyngier@arm.com>]

[Thanks Christoffer for cc'ing me]

On Thu, 01 Nov 2018 10:10:48 +0000,
Christoffer Dall <christoffer.dall@arm.com> wrote:
> 
> On Thu, Oct 18, 2018 at 05:17:57PM +0800, Li Zhang wrote:
> > Hi,
> > 
> > I run kvm-units-test on ARM server(QDF2400), but gicv2-ipi,
> > gicv2-active cases fail.
> 
> I didn't think QDF2400 has GICv2 on GICv3 support?
> 
> Do the test cases fail or are they reported as skipped?
> 
> > By debuging kvm-unit-tests source code, I found that interrupt is not
> > handled. do_handle_exception is not called.
> > 
> > By looking into KVM source code, it has GICv2 emulation on GICv3 support.
> > I've tried a lot of kernel versions, from v4.12~v4.19 in mainline,
> > these cases always fail.
> > Is it possible that hardware/software disables this?

Most implementations do not have the v2 compatibility interface, and
nobody really needs it. This is a convenient way to run older VMs that
do not know about GICv3 (32bit VMs, for example), but that's in no way
a common setup.

> > 
> > It seems that GICv2 is a little old for ARM server, I am confused when
> > we can use it.
> > Do we need to care about these cases?
> > 
> 
> I don't think you need to care.  I believe Marc has run the
> GICv2-on-GICv3 tests on his supported platforms with recent
> kvm-unit-tests and other have reported succes as well.

Here you go (on my Chromebook running 4.18):

PASS gicv2-ipi (3 tests)
PASS gicv2-mmio (17 tests)
PASS gicv2-mmio-up (17 tests)
PASS gicv2-mmio-3p (17 tests)
PASS gicv3-ipi (3 tests)
PASS gicv2-active (1 tests)
PASS gicv3-active (1 tests)

Thanks,

	M.

-- 
Jazz is not dead, it just smell funny.