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

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Message-ID: <your-ad-here.call-01718315436-ext-6568@work.hours>
Date: Thu, 13 Jun 2024 23:50:36 +0200
From: Vasily Gorbik <gor@...ux.ibm.com>
To: Halil Pasic <pasic@...ux.ibm.com>
Cc: Thomas Huth <thuth@...hat.com>, Cornelia Huck <cohuck@...hat.com>,
        Eric Farman <farman@...ux.ibm.com>, Heiko Carstens <hca@...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, Boqiao Fu <bfu@...hat.com>,
        Sebastian Mitterle <smitterl@...hat.com>
Subject: Re: [PATCH 1/1] s390/virtio_ccw: fix config change notifications

On Thu, Jun 13, 2024 at 03:21:15PM +0200, Halil Pasic wrote:
> On Wed, 12 Jun 2024 16:04:15 +0200
> Thomas Huth <thuth@...hat.com> wrote:
> 
> > 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
> > ?
> 
> Yep! That is a public bug tracker bug. Qualifies!
> @Vasily: Can you guys pick hat one up when picking the patch?

Sure, applied. Thanks!