* vhost, something changed between 2.6.35 and 2.6.36 ? @ 2010-09-10 13:37 Dhaval Giani 2010-09-12 12:05 ` Michael S. Tsirkin 0 siblings, 1 reply; 6+ messages in thread From: Dhaval Giani @ 2010-09-10 13:37 UTC (permalink / raw) To: kvm, mst Hi, I have been trying to get vhost+macvtap to work for me. I run it as /root/qemu-kvm-vhost-net/bin/qemu-system-x86_64 -hda $IMAGE -serial stdio -monitor telnet::4444,server,nowait -vnc :4: -m 3G -net nic,model=virtio,macaddr=$MACADDR,netdev=macvtap0 -netdev tap,id=macvtap0,vhost=on,fd=3 3<> /dev/tap5 in 2.6.35, which worked just fine. On the other hand, with 2.6.36, i don't have working networking. I am using the same image and same macaddress. The qemu is the version from git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git vhost . Any suggestions will be welcome! Thanks, Dhaval ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: vhost, something changed between 2.6.35 and 2.6.36 ? 2010-09-10 13:37 vhost, something changed between 2.6.35 and 2.6.36 ? Dhaval Giani @ 2010-09-12 12:05 ` Michael S. Tsirkin 2010-09-12 14:39 ` Dhaval Giani 0 siblings, 1 reply; 6+ messages in thread From: Michael S. Tsirkin @ 2010-09-12 12:05 UTC (permalink / raw) To: Dhaval Giani; +Cc: kvm On Fri, Sep 10, 2010 at 03:37:36PM +0200, Dhaval Giani wrote: > Hi, > > I have been trying to get vhost+macvtap to work for me. I run it as > > /root/qemu-kvm-vhost-net/bin/qemu-system-x86_64 -hda $IMAGE -serial > stdio -monitor telnet::4444,server,nowait -vnc :4: -m 3G -net > nic,model=virtio,macaddr=$MACADDR,netdev=macvtap0 -netdev > tap,id=macvtap0,vhost=on,fd=3 3<> /dev/tap5 > > in 2.6.35, which worked just fine. On the other hand, with 2.6.36, i > don't have working networking. I am using the same image and same > macaddress. The qemu is the version from > git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git vhost . BTW, by now, all these patches are merged so upstream qemu-kvm should work just fine for you as well. > Any suggestions will be welcome! > > Thanks, > Dhaval You are running this as non-root user, correct? This could be the permission issue that got fixed by 87d6a412bd1ed82c14cabd4b408003b23bbd2880. Could you please check the latest master from Linus, and let me and the list know? Thanks! Another thing to try if this does *not* help: enable CONFIG_DYNAMIC_DEBUG in kernel, rebuild the kernel, mount debugfs: mount -t debugfs none /sys/kernel/debug and then enable debug for vhost_net as described in Documentation/dynamic-debug-howto.txt: echo 'module vhost_net +p' > /sys/kernel/debug/dynamic_debug/control Then start qemu, and after running a test, run dmesg and see if there are any messages from vhost_net. If yes please send them to me and to the list. Thanks! -- MST ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: vhost, something changed between 2.6.35 and 2.6.36 ? 2010-09-12 12:05 ` Michael S. Tsirkin @ 2010-09-12 14:39 ` Dhaval Giani 2010-09-12 14:40 ` Michael S. Tsirkin 0 siblings, 1 reply; 6+ messages in thread From: Dhaval Giani @ 2010-09-12 14:39 UTC (permalink / raw) To: Michael S. Tsirkin; +Cc: kvm On Sun, Sep 12, 2010 at 2:05 PM, Michael S. Tsirkin <mst@redhat.com> wrote: > On Fri, Sep 10, 2010 at 03:37:36PM +0200, Dhaval Giani wrote: >> Hi, >> >> I have been trying to get vhost+macvtap to work for me. I run it as >> >> /root/qemu-kvm-vhost-net/bin/qemu-system-x86_64 -hda $IMAGE -serial >> stdio -monitor telnet::4444,server,nowait -vnc :4: -m 3G -net >> nic,model=virtio,macaddr=$MACADDR,netdev=macvtap0 -netdev >> tap,id=macvtap0,vhost=on,fd=3 3<> /dev/tap5 >> >> in 2.6.35, which worked just fine. On the other hand, with 2.6.36, i >> don't have working networking. I am using the same image and same >> macaddress. The qemu is the version from >> git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git vhost . > > BTW, by now, all these patches are merged so upstream qemu-kvm should work > just fine for you as well. > >> Any suggestions will be welcome! >> >> Thanks, >> Dhaval > > You are running this as non-root user, correct? nope as root. > This could be the permission issue that got fixed > by 87d6a412bd1ed82c14cabd4b408003b23bbd2880. > Could you please check the latest master from Linus, > and let me and the list know? Thanks! > this is with git of friday evening CEST. > Another thing to try if this does *not* help: > > enable CONFIG_DYNAMIC_DEBUG in kernel, > rebuild the kernel, > mount debugfs: > > mount -t debugfs none /sys/kernel/debug > > and then enable debug for vhost_net as described in > Documentation/dynamic-debug-howto.txt: > I will give this a run on monday morning when i am at the lab again. > echo 'module vhost_net +p' > /sys/kernel/debug/dynamic_debug/control > > Then start qemu, and after running a test, run dmesg and see if there > are any messages from vhost_net. If yes please send them to > me and to the list. > > Thanks! > thanks! Dhaval ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: vhost, something changed between 2.6.35 and 2.6.36 ? 2010-09-12 14:39 ` Dhaval Giani @ 2010-09-12 14:40 ` Michael S. Tsirkin 2010-09-13 14:25 ` Dhaval Giani 0 siblings, 1 reply; 6+ messages in thread From: Michael S. Tsirkin @ 2010-09-12 14:40 UTC (permalink / raw) To: Dhaval Giani; +Cc: kvm On Sun, Sep 12, 2010 at 04:39:29PM +0200, Dhaval Giani wrote: > On Sun, Sep 12, 2010 at 2:05 PM, Michael S. Tsirkin <mst@redhat.com> wrote: > > On Fri, Sep 10, 2010 at 03:37:36PM +0200, Dhaval Giani wrote: > >> Hi, > >> > >> I have been trying to get vhost+macvtap to work for me. I run it as > >> > >> /root/qemu-kvm-vhost-net/bin/qemu-system-x86_64 -hda $IMAGE -serial > >> stdio -monitor telnet::4444,server,nowait -vnc :4: -m 3G -net > >> nic,model=virtio,macaddr=$MACADDR,netdev=macvtap0 -netdev > >> tap,id=macvtap0,vhost=on,fd=3 3<> /dev/tap5 > >> > >> in 2.6.35, which worked just fine. On the other hand, with 2.6.36, i > >> don't have working networking. I am using the same image and same > >> macaddress. The qemu is the version from > >> git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git vhost . > > > > BTW, by now, all these patches are merged so upstream qemu-kvm should work > > just fine for you as well. > > > >> Any suggestions will be welcome! > >> > >> Thanks, > >> Dhaval > > > > You are running this as non-root user, correct? > > nope as root. > > > This could be the permission issue that got fixed > > by 87d6a412bd1ed82c14cabd4b408003b23bbd2880. > > Could you please check the latest master from Linus, > > and let me and the list know? Thanks! > > > > this is with git of friday evening CEST. > > > Another thing to try if this does *not* help: > > > > enable CONFIG_DYNAMIC_DEBUG in kernel, > > rebuild the kernel, > > mount debugfs: > > > > mount -t debugfs none /sys/kernel/debug > > > > and then enable debug for vhost_net as described in > > Documentation/dynamic-debug-howto.txt: > > > > I will give this a run on monday morning when i am at the lab again. > > > echo 'module vhost_net +p' > /sys/kernel/debug/dynamic_debug/control > > > > Then start qemu, and after running a test, run dmesg and see if there > > are any messages from vhost_net. If yes please send them to > > me and to the list. > > > > Thanks! > > > > > thanks! > Dhaval Another thing to try check is generic net core issues. For this, try running tcpdump on both tap in host and on virtio net device in guest. Then send packets to host from guest and back, and check whether they appears on virtio and on tap. Thanks! -- MST ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: vhost, something changed between 2.6.35 and 2.6.36 ? 2010-09-12 14:40 ` Michael S. Tsirkin @ 2010-09-13 14:25 ` Dhaval Giani 2010-09-13 14:42 ` Michael S. Tsirkin 0 siblings, 1 reply; 6+ messages in thread From: Dhaval Giani @ 2010-09-13 14:25 UTC (permalink / raw) To: Michael S. Tsirkin; +Cc: kvm (BTW, this is a regression from 2.6.35 at least. I will try to figure out the last working version if you would like a bisect!) On Sun, Sep 12, 2010 at 4:40 PM, Michael S. Tsirkin <mst@redhat.com> wrote: > On Sun, Sep 12, 2010 at 04:39:29PM +0200, Dhaval Giani wrote: >> On Sun, Sep 12, 2010 at 2:05 PM, Michael S. Tsirkin <mst@redhat.com> wrote: >> > On Fri, Sep 10, 2010 at 03:37:36PM +0200, Dhaval Giani wrote: >> >> Hi, >> >> >> >> I have been trying to get vhost+macvtap to work for me. I run it as >> >> >> >> /root/qemu-kvm-vhost-net/bin/qemu-system-x86_64 -hda $IMAGE -serial >> >> stdio -monitor telnet::4444,server,nowait -vnc :4: -m 3G -net >> >> nic,model=virtio,macaddr=$MACADDR,netdev=macvtap0 -netdev >> >> tap,id=macvtap0,vhost=on,fd=3 3<> /dev/tap5 >> >> >> >> in 2.6.35, which worked just fine. On the other hand, with 2.6.36, i >> >> don't have working networking. I am using the same image and same >> >> macaddress. The qemu is the version from >> >> git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git vhost . >> > >> > BTW, by now, all these patches are merged so upstream qemu-kvm should work >> > just fine for you as well. >> > >> >> Any suggestions will be welcome! >> >> >> >> Thanks, >> >> Dhaval >> > >> > You are running this as non-root user, correct? >> >> nope as root. >> >> > This could be the permission issue that got fixed >> > by 87d6a412bd1ed82c14cabd4b408003b23bbd2880. >> > Could you please check the latest master from Linus, >> > and let me and the list know? Thanks! >> > >> >> this is with git of friday evening CEST. >> >> > Another thing to try if this does *not* help: >> > >> > enable CONFIG_DYNAMIC_DEBUG in kernel, >> > rebuild the kernel, >> > mount debugfs: >> > >> > mount -t debugfs none /sys/kernel/debug >> > >> > and then enable debug for vhost_net as described in >> > Documentation/dynamic-debug-howto.txt: >> > >> >> I will give this a run on monday morning when i am at the lab again. >> So nothing comes out with this. >> > echo 'module vhost_net +p' > /sys/kernel/debug/dynamic_debug/control >> > >> > Then start qemu, and after running a test, run dmesg and see if there >> > are any messages from vhost_net. If yes please send them to >> > me and to the list. >> > >> > Thanks! >> > >> >> >> thanks! >> Dhaval > > Another thing to try check is generic net core issues. > > For this, try running tcpdump on both tap in host > and on virtio net device in guest. Then > send packets to host from guest and back, and check whether > they appears on virtio and on tap. > tcpdump -i macvtap0 on the host leads to nothing. tcpdump -i eth0 on the guest leads to ARP requests, with no responses. Anything more I can try? Thanks! Dhaval ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: vhost, something changed between 2.6.35 and 2.6.36 ? 2010-09-13 14:25 ` Dhaval Giani @ 2010-09-13 14:42 ` Michael S. Tsirkin 0 siblings, 0 replies; 6+ messages in thread From: Michael S. Tsirkin @ 2010-09-13 14:42 UTC (permalink / raw) To: Dhaval Giani; +Cc: kvm On Mon, Sep 13, 2010 at 04:25:13PM +0200, Dhaval Giani wrote: > (BTW, this is a regression from 2.6.35 at least. I will try to figure > out the last working version if you would like a bisect!) Sure, that's helpful. BTW, does latest upstream qemu-kvm have this issue as well for you? > On Sun, Sep 12, 2010 at 4:40 PM, Michael S. Tsirkin <mst@redhat.com> wrote: > > On Sun, Sep 12, 2010 at 04:39:29PM +0200, Dhaval Giani wrote: > >> On Sun, Sep 12, 2010 at 2:05 PM, Michael S. Tsirkin <mst@redhat.com> wrote: > >> > On Fri, Sep 10, 2010 at 03:37:36PM +0200, Dhaval Giani wrote: > >> >> Hi, > >> >> > >> >> I have been trying to get vhost+macvtap to work for me. I run it as > >> >> > >> >> /root/qemu-kvm-vhost-net/bin/qemu-system-x86_64 -hda $IMAGE -serial > >> >> stdio -monitor telnet::4444,server,nowait -vnc :4: -m 3G -net > >> >> nic,model=virtio,macaddr=$MACADDR,netdev=macvtap0 -netdev > >> >> tap,id=macvtap0,vhost=on,fd=3 3<> /dev/tap5 > >> >> > >> >> in 2.6.35, which worked just fine. On the other hand, with 2.6.36, i > >> >> don't have working networking. I am using the same image and same > >> >> macaddress. The qemu is the version from > >> >> git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git vhost . > >> > > >> > BTW, by now, all these patches are merged so upstream qemu-kvm should work > >> > just fine for you as well. > >> > > >> >> Any suggestions will be welcome! > >> >> > >> >> Thanks, > >> >> Dhaval > >> > > >> > You are running this as non-root user, correct? > >> > >> nope as root. > >> > >> > This could be the permission issue that got fixed > >> > by 87d6a412bd1ed82c14cabd4b408003b23bbd2880. > >> > Could you please check the latest master from Linus, > >> > and let me and the list know? Thanks! > >> > > >> > >> this is with git of friday evening CEST. > >> > >> > Another thing to try if this does *not* help: > >> > > >> > enable CONFIG_DYNAMIC_DEBUG in kernel, > >> > rebuild the kernel, > >> > mount debugfs: > >> > > >> > mount -t debugfs none /sys/kernel/debug > >> > > >> > and then enable debug for vhost_net as described in > >> > Documentation/dynamic-debug-howto.txt: > >> > > >> > >> I will give this a run on monday morning when i am at the lab again. > >> > > So nothing comes out with this. > > >> > echo 'module vhost_net +p' > /sys/kernel/debug/dynamic_debug/control > >> > > >> > Then start qemu, and after running a test, run dmesg and see if there > >> > are any messages from vhost_net. If yes please send them to > >> > me and to the list. > >> > > >> > Thanks! > >> > > >> > >> > >> thanks! > >> Dhaval > > > > Another thing to try check is generic net core issues. > > > > For this, try running tcpdump on both tap in host > > and on virtio net device in guest. Then > > send packets to host from guest and back, and check whether > > they appears on virtio and on tap. > > > > tcpdump -i macvtap0 on the host leads to nothing. > > tcpdump -i eth0 on the guest leads to ARP requests, with no responses. > > Anything more I can try? > > Thanks! > Dhaval So nothing is passed to tap, but no errors either. It might be helpful to enable function tracer and trace functions in our module. Alternatively, let's see if we get anything from the ring (don't forget to unload and reload vhost-net). diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 29e850a..6400cd5 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -152,6 +152,8 @@ static void handle_tx(struct vhost_net *net) ARRAY_SIZE(vq->iov), &out, &in, NULL, NULL); + printk(KERN_ERR "vhost_get_vq_desc returned %d\n", head); + /* On error, stop handling until the next kick. */ if (unlikely(head < 0)) break; ^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2010-09-13 14:48 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2010-09-10 13:37 vhost, something changed between 2.6.35 and 2.6.36 ? Dhaval Giani 2010-09-12 12:05 ` Michael S. Tsirkin 2010-09-12 14:39 ` Dhaval Giani 2010-09-12 14:40 ` Michael S. Tsirkin 2010-09-13 14:25 ` Dhaval Giani 2010-09-13 14:42 ` Michael S. Tsirkin
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox