Since I’m having problems getting sound from my guest VM (apparently virt-viewer doesn’t support sound), I decided to try and passthrough my onboard sound card directly to the guest. Only I’m not sure if I’m doing it right. I’ve read the instructions here: redhat.com/docs/en-US/Red_Ha … rough.html
All of the commands and features listed in the RHEL 6 docs exist in CentOS 5.5, at least they show up, so that’s what I decided to try. Only I bogged down on the very first step - removing the device drivers from CentOS to allow it to be assigned to the guest. When at a virsh prompt I type nodedev-dettach and the command simply hangs. No output, no errors onscreen or in any of the logs under System Log Viewer. And this is the case for any pci device I try to detach. So that leaves me wondering if virsh under CentOS actually supports this command or if it is a “ghost” command.
Has anyone actually passed through a PCI device on CentOS? How is it done? Should I be following the first instructions and just try to modify them to apply to CentOS? Is there another way to do this without using virsh?
Hi
I started with the information for redhat 5.5 http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.5/html/Virtualization_Guide/sect-Virtualization-PCding_a_PCI_device_to_a_host.html. But that doesn’t work. I get errors in /var/log/messages:
Jun 12 22:18:27 kvm kernel: tun: Universal TUN/TAP device driver, 1.6
Jun 12 22:18:27 kvm kernel: tun: (C) 1999-2004 Max Krasnyansky <[email protected]>
Jun 12 22:18:27 kvm kernel: device vnet0 entered promiscuous mode
Jun 12 22:18:27 kvm kernel: br0: port 2(vnet0) entering learning state
Jun 12 22:18:27 kvm kernel: ACPI: PCI Interrupt 0000:09:00.0[A] -> GSI 16 (level, low) -> IRQ 185
Jun 12 22:18:27 kvm kernel: IRQ handler type mismatch for IRQ 185
Jun 12 22:18:27 kvm kernel:
Jun 12 22:18:27 kvm kernel: Call Trace:
Jun 12 22:18:27 kvm kernel: <ffffffff800bb4c7>] setup_irq+0x1b7/0x1cf
Jun 12 22:18:27 kvm kernel: <ffffffff883eb87c>] :kvm:kvm_irq_thunk+0x0/0xe
Jun 12 22:18:27 kvm kernel: <ffffffff800bb58f>] request_irq+0xb0/0xd6
Jun 12 22:18:27 kvm kernel: <ffffffff883d37c9>] :kvm:kvm_assigned_dev_intr+0x0/0xa5
Jun 12 22:18:27 kvm kernel: <ffffffff883eb928>] :kvm:kvm_request_irq+0x5e/0x8a
Jun 12 22:18:27 kvm kernel: <ffffffff883d5204>] :kvm:kvm_vm_ioctl+0x5f5/0xad8
Jun 12 22:18:27 kvm kernel: <ffffffff80017b41>] cache_grow+0x35a/0x3c1
Jun 12 22:18:27 kvm kernel: <ffffffff802239bd>] pci_conf1_read+0xcc/0xd7
Jun 12 22:18:27 kvm kernel: <ffffffff801586c5>] pci_user_read_config_byte+0x7c/0x90
Jun 12 22:18:27 kvm kernel: <ffffffff80042141>] do_ioctl+0x21/0x6b
Jun 12 22:18:27 kvm kernel: <ffffffff8003018e>] vfs_ioctl+0x457/0x4b9
Jun 12 22:18:27 kvm kernel: <ffffffff800b76a6>] audit_syscall_entry+0x180/0x1b3
Jun 12 22:18:27 kvm kernel: <ffffffff8004c870>] sys_ioctl+0x59/0x78
Jun 12 22:18:27 kvm kernel: <ffffffff8005d28d>] tracesys+0xd5/0xe0
Jun 12 22:18:27 kvm libvirtd: 22:18:27.805: error : internal error unable to start guest: char device redirected to /dev/pts/1 char device redirected to /dev/pts/2
Jun 12 22:18:27 kvm kernel:
Jun 12 22:18:27 kvm kernel: ACPI: PCI interrupt for device 0000:09:00.0 disabled
Jun 12 22:18:27 kvm kernel: br0: port 2(vnet0) entering disabled state
Jun 12 22:18:27 kvm kernel: device vnet0 left promiscuous mode
Jun 12 22:18:27 kvm kernel: br0: port 2(vnet0) entering disabled state
It looks like there is a problem with shared IQR. Can anybody help?
Thanks
Roland
hi
I am trying to do something equivalent with Proxmox on Debian
I have an external tape drive on my host that is plugged via an scsci pci card, I want it to be accessible in a VM.
I tried to configure the qemu with " scsi0: /dev/nst0 " but it doesn’t work ( the VM refuse to boot, nothing special in syslog ) so I tried the method like in linux-kvm.org/page/How_to_as … T-d_in_KVM
Now i am able to see the scsi card on the VM with lspci but I still don’t see the tape drive. Does anybody tried do do this ? Is there other methods to make the tape drive directly accessible by the VM ?
Thanks
Hugo
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