------- Comment From ale...@au1.ibm.com 2016-10-06 03:23 EDT------- The message means that KVM cannot accelerate TCE operations on one of DMA windows, in this particular case - the huge DMA window. Such support is not present in the HostOS as it is not in upstream kernel so there is a message.
Commit 178a7875 tried adding VFIO KVM device but it did not on PPC64 book3s KVM due to a mistake, This - https://git.kernel.org/cgit/linux/kernel/git/paulus/powerpc.git/commit/?h =kvm-ppc-next&id=4b3d173d0440d37534906b6d93c02dfb577c68ce - does add it but it is not in upstream yet. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1630554 Title: QEMU throws failure msg while booting guest with SRIOV VF Status in linux package in Ubuntu: New Bug description: == Comment: #10 - VIPIN K. PARASHAR <vipar...@in.ibm.com> - 2016-10-04 02:39:30 == (In reply to comment #9) > I took a quick look to this one and also noticed these 2 links: > https://bugzilla.redhat.com/show_bug.cgi?id=1237034 > http://marc.info/?l=linux-kernel&m=143737274332400&w=2 > and it looks like to avoid these message maybe just need to have this in > config file: > CONFIG_KVM_VFIO=y > I think we have that in powerkvm but not in Ubuntu KVM. On x86 running Ubuntu 16.04 ================== $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.1 LTS Release: 16.04 Codename: xenial $ head /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 61 model name : Intel(R) Core(TM) i5-5300U CPU @ 2.30GHz stepping : 4 microcode : 0x22 cpu MHz : 2300.179 cache size : 3072 KB physical id : 0 $ uname -a Linux Workstation 4.4.0-38-generic #57-Ubuntu SMP Tue Sep 6 15:42:33 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux $ grep CONFIG_KVM_VFIO /boot/config-4.4.0-38-generic CONFIG_KVM_VFIO=y $ On PowerPC ======== # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu Yakkety Yak (development branch) Release: 16.10 Codename: yakkety # head /proc/cpuinfo processor : 0 cpu : POWER8E (raw), altivec supported clock : 2061.000000MHz revision : 2.1 (pvr 004b 0201) processor : 1 cpu : POWER8E (raw), altivec supported clock : 2061.000000MHz revision : 2.1 (pvr 004b 0201) # uname -a Linux c158f2u09os 4.8.0-17-generic #19 SMP Thu Sep 29 12:03:21 CDT 2016 ppc64le ppc64le ppc64le GNU/Linux # grep CONFIG_KVM_VFIO /boot/config-4.8.0-17-generic # I see that CONFIG_KVM_VFIO is enabled on x86 running Ubuntu 16.04 while ppc64 running 16.10 doesn't have it enabled. == Comment: #9 - Carol L. Soto <cls...@us.ibm.com> - 2016-09-30 16:25:32 == I took a quick look to this one and also noticed these 2 links: https://bugzilla.redhat.com/show_bug.cgi?id=1237034 http://marc.info/?l=linux-kernel&m=143737274332400&w=2 and it looks like to avoid these message maybe just need to have this in config file: CONFIG_KVM_VFIO=y I think we have that in powerkvm but not in Ubuntu KVM. == Comment: #6 - VIPIN K. PARASHAR <vipar...@in.ibm.com> - 2016-09-23 06:50:22 == $ git log 178a787502123b0 -1 commit 178a787502123b01499c5a4617b94bb69ad49dd5 Author: David Gibson <da...@gibson.dropbear.id.au> Date: Mon Feb 1 11:14:15 2016 +1100 vfio: Enable VFIO device for powerpc ec53500f "kvm: Add VFIO device" added a special KVM pseudo-device which is used to handle any necessary interactions between KVM and VFIO. Currently that device is built on x86 and ARM, but not powerpc, although powerpc does support both KVM and VFIO. This makes things awkward in userspace Currently qemu prints an alarming error message if you attempt to use VFIO and it can't initialize the KVM VFIO device. We don't want to remove the warning, because lack of the KVM VFIO device could mean coherency problems on x86. On powerpc, however, the error is harmless but looks disturbing, and a test based on host architecture in qemu would be ugly, and break if we do need the KVM VFIO device for something important in future. There's nothing preventing the KVM VFIO device from being built for powerpc, so this patch turns it on. It won't actually do anything, since we don't define any of the arch_*() hooks, but it will make qemu happy and we can extend it in future if we need to. Signed-off-by: David Gibson <da...@gibson.dropbear.id.au> Reviewed-by: Eric Auger <eric.au...@linaro.org> Signed-off-by: Paul Mackerras <pau...@samba.org> $ $ git describe --contains 178a787502123b v4.6-rc1~141^2~49^2~20 $ Commit (178a7875) seems to have enabled VFIO devices for powerpc. But this commit should already be available since 4.6 kernel and ubuntu is using 4.7 kernel here, so this should be already in. == Comment: #0 - SRIKANTH B. AITHAL <bssrika...@in.ibm.com> - 2016-09-15 12:31:49 == ---Problem Description--- QEMU throwing false failure message while booting guest with SRIOV VF device ---uname output--- Linux c158f2u09os 4.7.0unofficial #5 SMP Mon Sep 5 08:53:38 EDT 2016 ppc64le ppc64le ppc64le GNU/Linux ---Additional Hardware Info--- Mellanox CX4 Machine Type = 8247-22L ---Debugger--- A debugger is not configured ---Steps to Reproduce--- 1. Edit guest ubuntu1610_srik and add below VF device [cold plug] <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0005' bus='0x01' slot='0x00' function='0x3'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/> </hostdev> 2. Start the guest: virsh start ubuntu1610_srik 3. In the /var/log/libvirt/qemu/ubuntu1610_srik.log we will notice below failure message. "-device vfio-pci,host=0005:01:00.3,id=hostdev0,bus=pci.0,addr=0x1: Failed to create KVM VFIO device: No such device" But VF would have been passthroughed and probed succesfully inside the guest.. I could configure it and transfer data over it.. and VF got reprobed succesfully in host after I took down 'ubuntu1610_srik'. This bug is to see why QEMU is printing false failure message. ===================== Environment details: ===================== Host : Ubuntu 16.10 kernel version: Linux c158f2u09os 4.7.0unofficial #5 SMP Mon Sep 5 08:53:38 EDT 2016 ppc64le ppc64le ppc64le GNU/Linux Guest: 1. ubuntu1610_srik kernel version: 4.7.0unofficial 2. ubuntu160401_srik kernel version: 4.4.0-38-generic MOFED versions: MOFED version in Host as well Guest: 3.4-OFED.3.4.0.1.0.1 CX4 Firmware version: 12.17.0222 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1630554/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
