From: "Michael S. Tsirkin" <mst@redhat.com> To: Marcel Apfelbaum <marcel@redhat.com> Cc: James Hogan <james.hogan@imgtec.com>, qemu-devel@nongnu.org, Jason Wang <jasowang@redhat.com>, virtualization@lists.linux-foundation.org Subject: Re: [Qemu-devel] [BUG] virtio-net linux driver fails to probe on MIPS Malta since 'hw/virtio-pci: fix virtio behaviour' Date: Mon, 20 Mar 2017 17:43:00 +0200 [thread overview] Message-ID: <20170320174101-mutt-send-email-mst@kernel.org> (raw) In-Reply-To: <6b3ec98b-55e2-ecc8-d962-dc9d13866319@redhat.com> On Mon, Mar 20, 2017 at 05:21:22PM +0200, Marcel Apfelbaum wrote: > On 03/17/2017 11:57 PM, James Hogan wrote: > > Hi, > > > > I've bisected the following failure of the virtio_net linux v4.10 driver > > to probe in QEMU v2.9.0-rc1 emulating a MIPS Malta machine: > > > > virtio_net virtio0: virtio: device uses modern interface but does not have VIRTIO_F_VERSION_1 > > virtio_net: probe of virtio0 failed with error -22 > > > > To QEMU commit 9a4c0e220d8a ("hw/virtio-pci: fix virtio behaviour"). > > > > It appears that adding ",disable-modern=on,disable-legacy=off" to the > > virtio-net -device makes it work again. > > > > I presume this should really just work out of the box. Any ideas why it > > isn't? > > > > Hi, > > > This is strange. This commit changes virtio devices from legacy to virtio "transitional". > (your command line changes it to legacy) > Linux 4.10 supports virtio modern/transitional (as far as I know) and on QEMU side > there is nothing new. > > Michael, do you have any idea? > > Thanks, > Marcel My guess would be firmware mishandling 64 bit BARs - we saw such a case on sparc previously. As a result you are probably reading all zeroes from features register or something like that. Marcel, could you send a patch making the bar 32 bit? If that helps we know what the issue is. > > Cheers > > James > >
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com> To: Marcel Apfelbaum <marcel@redhat.com> Cc: James Hogan <james.hogan@imgtec.com>, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org Subject: Re: [BUG] virtio-net linux driver fails to probe on MIPS Malta since 'hw/virtio-pci: fix virtio behaviour' Date: Mon, 20 Mar 2017 17:43:00 +0200 [thread overview] Message-ID: <20170320174101-mutt-send-email-mst@kernel.org> (raw) In-Reply-To: <6b3ec98b-55e2-ecc8-d962-dc9d13866319@redhat.com> On Mon, Mar 20, 2017 at 05:21:22PM +0200, Marcel Apfelbaum wrote: > On 03/17/2017 11:57 PM, James Hogan wrote: > > Hi, > > > > I've bisected the following failure of the virtio_net linux v4.10 driver > > to probe in QEMU v2.9.0-rc1 emulating a MIPS Malta machine: > > > > virtio_net virtio0: virtio: device uses modern interface but does not have VIRTIO_F_VERSION_1 > > virtio_net: probe of virtio0 failed with error -22 > > > > To QEMU commit 9a4c0e220d8a ("hw/virtio-pci: fix virtio behaviour"). > > > > It appears that adding ",disable-modern=on,disable-legacy=off" to the > > virtio-net -device makes it work again. > > > > I presume this should really just work out of the box. Any ideas why it > > isn't? > > > > Hi, > > > This is strange. This commit changes virtio devices from legacy to virtio "transitional". > (your command line changes it to legacy) > Linux 4.10 supports virtio modern/transitional (as far as I know) and on QEMU side > there is nothing new. > > Michael, do you have any idea? > > Thanks, > Marcel My guess would be firmware mishandling 64 bit BARs - we saw such a case on sparc previously. As a result you are probably reading all zeroes from features register or something like that. Marcel, could you send a patch making the bar 32 bit? If that helps we know what the issue is. > > Cheers > > James > >
next prev parent reply other threads:[~2017-03-20 15:43 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-17 21:57 [Qemu-devel] [BUG] virtio-net linux driver fails to probe on MIPS Malta since 'hw/virtio-pci: fix virtio behaviour' James Hogan 2017-03-17 21:57 ` James Hogan 2017-03-20 15:21 ` [Qemu-devel] " Marcel Apfelbaum 2017-03-20 15:21 ` Marcel Apfelbaum 2017-03-20 15:43 ` Michael S. Tsirkin [this message] 2017-03-20 15:43 ` Michael S. Tsirkin 2017-03-20 16:02 ` [Qemu-devel] " Marcel Apfelbaum 2017-03-20 16:02 ` Marcel Apfelbaum 2017-03-21 14:16 ` [Qemu-devel] " Marcel Apfelbaum 2017-03-21 14:16 ` Marcel Apfelbaum 2017-03-27 18:45 ` [Qemu-devel] " James Hogan 2017-03-27 18:45 ` James Hogan
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