linux-kernel - Re: [PATCH v2 000/144] KVM: selftests: Overhaul APIs, purge VCPU

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Date:   Wed, 8 Jun 2022 00:27:21 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, Vitaly Kuznetsov <vkuznets@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        David Matlack <dmatlack@...gle.com>,
        Ben Gardon <bgardon@...gle.com>,
        Oliver Upton <oupton@...gle.com>, linux-kernel@...r.kernel.org,
        Marc Zyngier <Marc.Zyngier@....com>,
        "anup@...infault.org" <anup@...infault.org>,
        Raghavendra Rao Ananta <rananta@...gle.com>
Subject: Re: [PATCH v2 000/144] KVM: selftests: Overhaul APIs, purge VCPU_ID

On Tue, Jun 07, 2022, Sean Christopherson wrote:
> On Tue, Jun 07, 2022, Sean Christopherson wrote:
> > +Raghu
> > 
> > On Tue, Jun 07, 2022, Paolo Bonzini wrote:
> > > Marc, Christian, Anup, can you please give this a go?
> > 
> > Raghu is going to run on arm64, I'll work with him to iron out any bugs (I should
> > have done this before posting).  I.e. Marc is mostly off the hook unless there's
> > tests we can't run.
> 
> arm64 is quite broken, the only tests that pass are those that don't actually
> enter the guest.  Common tests, e.g. rseq and memslots tests, fail with the same
> signature, so presumably I botched something in lib/aarch64, but I haven't been
> able to find anything via inspection.
> 
> Raghu is bisecting...

Ha!  Looks like it's an issue with running upstream selftest using one of our many
internal framework things.  Running a few of the tests manually works.  We should
have full results tomorrow.

I did find one bug during my inspection, in case someone gets ambitious and wants
to run tests too :-)

diff --git a/tools/testing/selftests/kvm/lib/aarch64/vgic.c b/tools/testing/selftests/kvm/lib/aarch64/vgic.c
index 0de9b0686498..b5f28d21a947 100644
--- a/tools/testing/selftests/kvm/lib/aarch64/vgic.c
+++ b/tools/testing/selftests/kvm/lib/aarch64/vgic.c
@@ -55,7 +55,7 @@ int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs,
        if (gic_fd < 0)
                return gic_fd;

-       kvm_device_attr_get(gic_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0, &nr_irqs);
+       kvm_device_attr_set(gic_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0, &nr_irqs);

        kvm_device_attr_set(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
                            KVM_DEV_ARM_VGIC_CTRL_INIT, NULL);