linux-kernel - Re: [GIT PULL] virtio: fixes, features

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Date:   Wed, 12 Oct 2022 17:21:24 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        alvaro.karsz@...id-run.com, angus.chen@...uarmicro.com,
        gavinl@...dia.com, jasowang@...hat.com, lingshan.zhu@...el.com,
        mst@...hat.com, wangdeming@...pur.com, xiujianfeng@...wei.com,
        linuxppc-dev@...ts.ozlabs.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [GIT PULL] virtio: fixes, features

"Michael S. Tsirkin" <mst@...hat.com> writes:
> The following changes since commit 4fe89d07dcc2804c8b562f6c7896a45643d34b2f:
>
>   Linux 6.0 (2022-10-02 14:09:07 -0700)
>
> are available in the Git repository at:
>
>   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git tags/for_linus
>
> for you to fetch changes up to 71491c54eafa318fdd24a1f26a1c82b28e1ac21d:
>
>   virtio_pci: don't try to use intxif pin is zero (2022-10-07 20:00:44 -0400)
>
> ----------------------------------------------------------------
> virtio: fixes, features
>
> 9k mtu perf improvements
> vdpa feature provisioning
> virtio blk SECURE ERASE support
>
> Fixes, cleanups all over the place.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
>
> ----------------------------------------------------------------
> Alvaro Karsz (1):
>       virtio_blk: add SECURE ERASE command support
>
> Angus Chen (1):
>       virtio_pci: don't try to use intxif pin is zero

This commit breaks virtio_pci for me on powerpc, when running as a qemu
guest.

vp_find_vqs() bails out because pci_dev->pin == 0.

But pci_dev->irq is populated correctly, so vp_find_vqs_intx() would
succeed if we called it - which is what the code used to do.

I think this happens because pci_dev->pin is not populated in
pci_assign_irq().

I would absolutely believe this is bug in our PCI code, but I think it
may also affect other platforms that use of_irq_parse_and_map_pci().

cheers