linux-kernel - Re: [PATCH 1/1] s390/virtio_ccw: fix config change notifications

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Date: Wed, 12 Jun 2024 16:04:15 +0200
From: Thomas Huth <thuth@...hat.com>
To: Halil Pasic <pasic@...ux.ibm.com>, Cornelia Huck <cohuck@...hat.com>,
 Eric Farman <farman@...ux.ibm.com>, Heiko Carstens <hca@...ux.ibm.com>,
 Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev
 <agordeev@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>,
 Sven Schnelle <svens@...ux.ibm.com>, linux-s390@...r.kernel.org,
 virtualization@...ts.linux.dev, kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: Boqiao Fu <bfu@...hat.com>, Sebastian Mitterle <smitterl@...hat.com>
Subject: Re: [PATCH 1/1] s390/virtio_ccw: fix config change notifications

On 11/06/2024 23.47, Halil Pasic wrote:
> Commit e3e9bda38e6d ("s390/virtio_ccw: use DMA handle from DMA API")
> broke configuration change notifications for virtio-ccw by putting the
> DMA address of *indicatorp directly into ccw->cda disregarding the fact
> that if !!(vcdev->is_thinint) then the function
> virtio_ccw_register_adapter_ind() will overwrite that ccw->cda value
> with the address of the virtio_thinint_area so it can actually set up
> the adapter interrupts via CCW_CMD_SET_IND_ADAPTER.  Thus we end up
> pointing to the wrong object for both CCW_CMD_SET_IND if setting up the
> adapter interrupts fails, and for CCW_CMD_SET_CONF_IND regardless
> whether it succeeds or fails.
> 
> To fix this, let us save away the dma address of *indicatorp in a local
> variable, and copy it to ccw->cda after the "vcdev->is_thinint" branch.
> 
> Reported-by: Boqiao Fu <bfu@...hat.com>
> Reported-by: Sebastian Mitterle <smitterl@...hat.com>
> Fixes: e3e9bda38e6d ("s390/virtio_ccw: use DMA handle from DMA API")
> Signed-off-by: Halil Pasic <pasic@...ux.ibm.com>
> ---
> I know that checkpatch.pl complains about a missing 'Closes' tag.
> Unfortunately I don't have an appropriate URL at hand. @Sebastian,
> @Boqiao: do you have any suggetions?

Closes: https://issues.redhat.com/browse/RHEL-39983
?

Anyway, I've tested the patch and it indeed fixes the problem with 
virtio-balloon and the link state for me:

Tested-by: Thomas Huth <thuth@...hat.com>