On 01.03.2010, at 18:51, Marcelo Tosatti wrote: > On Fri, Feb 26, 2010 at 03:53:48PM +0100, Alexander Graf wrote: >> >> On 26.02.2010, at 15:12, Alexander Graf wrote: >> >>> Hi list, >>> >>> While trying to upgrade some internal infrastructure to qemu-kvm-0.12 I stumbled across this really weird problem that I see with current qemu-kvm git too: >>> >>> I start qemu-kvm using: >>> >>> ./qemu-system-x86_64 -L ../pc-bios/ -m 512 -net nic,model=virtio -net tap,ifname=tap0,script=/bin/true -snapshot sles11.qcow2 -vnc :0 -monitor stdio >>> >>> The system boots up just fine, networking works. >>> >>> On the qemu monitor I then issue: >>> >>> (qemu) pci_add auto storage file=/tmp/image.raw,if=virtio >>> >>> after which I get a fully functional virtio block device, but the network stops sending/receiving packets. >>> >>> The same thing with qemu-kvm-0.10 works just fine. Has anyone seen this before? >> >> Same thing happens when hotplug only: >> >> pci_add auto nic model=virtio,vlan=0 >> >> -> network works >> >> pci_add auto storage file=/tmp/image.raw,if=virtio >> >> -> network stops working >> >> pci_add auto nic model=virtio,vlan=0 >> >> -> network works again on the new device > > Can reproduce it. "info pci" shows IRQ0 assigned to virtio-blk. > Did you try, say, e1000 and SCSI ? I just sent a reply to qemu-devel today (Re: [Qemu-devel] [PATCH] VirtIO: Fix QEMU crash during Windows PNP tests) explaining what is broken. So no, it seems to be a virtio issue. I really have no idea why bus mastering doesn't get enabled though. Alex-- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
