From: Halil Pasic <pasic@linux.ibm.com>
To: Pierre Morel <pmorel@linux.ibm.com>
Cc: linux-kernel@vger.kernel.org, borntraeger@de.ibm.com,
frankja@linux.ibm.com, mst@redhat.com, jasowang@redhat.com,
cohuck@redhat.com, kvm@vger.kernel.org,
linux-s390@vger.kernel.org,
virtualization@lists.linux-foundation.org,
thomas.lendacky@amd.com,
David Gibson <david@gibson.dropbear.id.au>,
Ram Pai <linuxram@us.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>
Subject: Re: [PATCH v2 1/1] s390: virtio: let arch accept devices without IOMMU feature
Date: Tue, 16 Jun 2020 13:57:26 +0200 [thread overview]
Message-ID: <20200616135726.04fa8314.pasic@linux.ibm.com> (raw)
In-Reply-To: <ef235cc9-9d4b-1247-c01a-9dd1c63f437c@linux.ibm.com>
On Tue, 16 Jun 2020 12:52:50 +0200
Pierre Morel <pmorel@linux.ibm.com> wrote:
> >> int virtio_finalize_features(struct virtio_device *dev)
> >> {
> >> int ret = dev->config->finalize_features(dev);
> >> @@ -179,6 +184,10 @@ int virtio_finalize_features(struct virtio_device *dev)
> >> if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1))
> >> return 0;
> >>
> >> + if (arch_needs_iommu_platform(dev) &&
> >> + !virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM))
> >> + return -EIO;
> >> +
> >
> > Why EIO?
>
> Because I/O can not occur correctly?
> I am open to suggestions.
We use -ENODEV if feature when the device rejects the features we
tried to negotiate (see virtio_finalize_features()) and -EINVAL when
the F_VERSION_1 and the virtio-ccw revision ain't coherent (in
virtio_ccw_finalize_features()). Any of those seems more fitting
that EIO to me. BTW does the error code itself matter in any way,
or is it just OK vs some error?
Regards,
Halil
next prev parent reply other threads:[~2020-06-16 11:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-15 12:39 [PATCH v2 0/1] s390: virtio: let's arch choose to accept devices without IOMMU feature Pierre Morel
2020-06-15 12:39 ` [PATCH v2 1/1] s390: virtio: let arch " Pierre Morel
2020-06-16 6:22 ` Jason Wang
2020-06-16 7:33 ` Pierre Morel
2020-06-16 6:55 ` Christian Borntraeger
2020-06-16 7:35 ` Pierre Morel
2020-06-16 12:21 ` Cornelia Huck
2020-06-16 9:52 ` Halil Pasic
2020-06-16 10:52 ` Pierre Morel
2020-06-16 11:57 ` Halil Pasic [this message]
2020-06-16 12:17 ` Cornelia Huck
2020-06-16 13:41 ` Pierre Morel
2020-06-16 13:50 ` Cornelia Huck
2020-06-16 12:20 ` Cornelia Huck
2020-06-16 13:36 ` Pierre Morel
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