On Mon, 2009-05-04 at 17:49 +0800, Sheng Yang wrote: > On Monday 04 May 2009 17:11:59 Nicholas A. Bellinger wrote: > > On Mon, 2009-05-04 at 16:20 +0800, Sheng Yang wrote: > > > On Monday 04 May 2009 12:36:04 Nicholas A. Bellinger wrote: > > > > On Mon, 2009-05-04 at 10:09 +0800, Sheng Yang wrote: > > > > > On Monday 04 May 2009 08:53:07 Nicholas A. Bellinger wrote: > > > > > > On Sat, 2009-05-02 at 18:22 +0800, Sheng Yang wrote: > > > > > > > On Thu, Apr 30, 2009 at 01:22:54PM -0700, Nicholas A. Bellinger > wrote: > > > > > > > > Greetings KVM folks, > > > > > > > > > > > > > > > > I wondering if any information exists for doing SR-IOV on the > > > > > > > > new VT-d capable chipsets with KVM..? From what I understand > > > > > > > > the patches for doing this with KVM are floating around, but I > > > > > > > > have been unable to find any user-level docs for actually > > > > > > > > making it all go against a upstream v2.6.30-rc3 code.. > > > > > > > > > > > > > > > > So far I have been doing IOV testing with Xen 3.3 and > > > > > > > > 3.4.0-pre, and I am really hoping to be able to jump to KVM for > > > > > > > > single-function and and then multi-function SR-IOV. I know > > > > > > > > that the VM migration stuff for IOV in Xen is up and running, > > > > > > > > and I assume it is being worked in for KVM instance migration > > > > > > > > as well..? This part is less important (at least for me :-) > > > > > > > > than getting a stable SR-IOV setup running under the KVM > > > > > > > > hypervisor.. Does anyone have any pointers for this..? > > > > > > > > > > > > > > > > Any comments or suggestions are appreciated! > > > > > > > > > > > > > > Hi Nicholas > > > > > > > > > > > > > > The patches are not floating around now. As you know, SR-IOV for > > > > > > > Linux have been in 2.6.30, so then you can use upstream KVM and > > > > > > > qemu-kvm(or recent released kvm-85) with 2.6.30-rc3 as host > > > > > > > kernel. And some time ago, there are several SRIOV related > > > > > > > patches for qemu-kvm, and now they all have been checked in. > > > > > > > > > > > > > > And for KVM, the extra document is not necessary, for you can > > > > > > > simple assign a VF to guest like any other devices. And how to > > > > > > > create VF is specific for each device driver. So just create a VF > > > > > > > then assign it to KVM guest is fine. > > > > > > > > > > > > Greetings Sheng, > > > > > > > > > > > > So, I have been trying the latest kvm-85 release on a v2.6.30-rc3 > > > > > > checkout from linux-2.6.git on a CentOS 5u3 x86_64 install on Intel > > > > > > IOH-5520 based dual socket Nehalem board. I have enabled DMAR and > > > > > > Interrupt Remapping my KVM host using v2.6.30-rc3 and from what I > > > > > > can tell, the KVM_CAP_* defines from libkvm are enabled with > > > > > > building kvm-85 after './configure > > > > > > --kerneldir=/usr/src/linux-2.6.git' and the PCI passthrough code is > > > > > > being enabled in > > > > > > kvm-85/qemu/hw/device-assignment.c AFAICT.. > > > > > > > > > > > > >From there, I use the freshly installed qemu-x86_64-system binary > > > > > > > to > > > > > > > > > > > > start a Debian 5 x86_64 HVM (that previously had been moving > > > > > > network packets under Xen for PCIe passthrough). I see the MSI-X > > > > > > interrupt remapping working on the KVM host for the passed > > > > > > -pcidevice, and the MMIO mappings from the qemu build that I also > > > > > > saw while using Xen/qemu-dm built with PCI passthrough are there as > > > > > > well.. > > > > > > > > > > Hi Nicholas > > > > > > > > > > > But while the KVM guest is booting, I see the following > > > > > > exception(s) from qemu-x86_64-system for one of the VFs for a > > > > > > multi-function PCIe device: > > > > > > > > > > > > BUG: kvm_destroy_phys_mem: invalid parameters (slot=-1) > > > > > > > > > > This one is mostly harmless. > > > > > > > > Ok, good to know.. :-) > > > > > > > > > > I try with one of the on-board e1000e ports (02:00.0) and I see the > > > > > > same exception along with some MSI-X exceptions from > > > > > > qemu-x86_64-system in KVM guest.. However, I am still able to see > > > > > > the e1000e and the other vxge multi-function device with lspci, but > > > > > > I am unable to dhcp or ping with the e1000e and VF from > > > > > > multi-function device fails to register the MSI-X interrupt in the > > > > > > guest.. > > > > > > > > > > Did you see the interrupt in the guest and host side? > > > > > > > > Ok, I am restarting the e1000e test with a fresh Fedora 11 install and > > > > KVM host kernel 2.6.29.1-111.fc11.x86_64. After unbinding and > > > > attaching the e1000e single-function device at 02:00.0 to pci-stub > > > > with: > > > > > > > > echo "8086 10d3" > /sys/bus/pci/drivers/pci-stub/new_id > > > > echo 0000:02:00.0 > /sys/bus/pci/devices/0000:02:00.0/driver/unbind > > > > echo 0000:02:00.0 > /sys/bus/pci/drivers/pci-stub/bind > > > > > > > > I see the following the KVM host kernel ring buffer: > > > > > > > > e1000e 0000:02:00.0: PCI INT A disabled > > > > pci-stub 0000:02:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17 > > > > pci-stub 0000:02:00.0: irq 58 for MSI/MSI-X > > > > > > > > > I think you can try on- > > > > > board e1000e for MSI-X first. And please ensure correlated driver > > > > > have been loaded correctly. > > > > > > > > <nod>.. > > > > > > > > > And what do you mean by "some MSI-X exceptions"? Better with > > > > > the log. > > > > > > > > Ok, with the Fedora 11 installed qemu-kemu, I see the expected > > > > kvm_destroy_phys_mem() statements: > > > > > > > > #kvm-host qemu-kvm -m 2048 -smp 8 -pcidevice host=02:00.0 > > > > lenny64guest1-orig.img BUG: kvm_destroy_phys_mem: invalid parameters > > > > (slot=-1) > > > > BUG: kvm_destroy_phys_mem: invalid parameters (slot=-1) > > > > > > > > However I still see the following in the KVM guest kernel ring buffer > > > > running v2.6.30-rc in the HVM guest. > > > > > > > > [ 5.523790] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 10 > > > > [ 5.524582] e1000e 0000:00:05.0: PCI INT A -> Link[LNKA] -> GSI 10 > > > > (level, high) -> IRQ 10 [ 5.525710] e1000e 0000:00:05.0: setting > > > > latency timer to 64 > > > > [ 5.526048] 0000:00:05.0: 0000:00:05.0: Failed to initialize MSI-X > > > > interrupts. Falling back to MSI interrupts. [ 5.527200] > > > > 0000:00:05.0: 0000:00:05.0: Failed to initialize MSI interrupts. > > > > Falling back to legacy interrupts. [ 5.829988] 0000:00:05.0: eth0: > > > > (PCI Express:2.5GB/s:Width x1) 00:e0:81:c0:90:b2 [ 5.830672] > > > > 0000:00:05.0: eth0: Intel(R) PRO/1000 Network Connection [ 5.831240] > > > > 0000:00:05.0: eth0: MAC: 3, PHY: 8, PBA No: ffffff-0ff > > > > > > Hi Nicholas > > > > > > I think something need to be clarify: > > > 1. For SRIOV, you need 2.6.30 as host kernel... But it's better to know > > > if normal device assignment work in your environment at first. > > > 2. The Fedora's userspace is even more old... You'd better try qemu-kvm > > > upstream, which is more convenient for us to track the problem(and kvm-85 > > > is also ok). And as you see above, your QEmu don't support MSI/MSIX... > > > > Ok, got it.. > > > > > So you can: > > > 1. Use latest qemu-kvm or kvm-85's QEmu. As well as latest KVM. > > > > Ok, I am now updated on in the FC 11 Host with kvm-85 kernel modules and > > am using the built qemu-system-x86_64 from the kvm-85 source package: > > > > loaded kvm module (kvm-85) > > QEMU PC emulator version 0.10.0 (kvm-85), Copyright (c) 2003-2008 Fabrice > > Bellard > > > > > 2. Your host kernel is Fedora 11 Preview, that should be fine with device > > > assignment at first(and let's solve it first, SRIOV the next step). > > > > Ok, yeah I will stick with the v2.6.29 fc11 kernel on the KVM host for > > the momemt to get e1000e working. But I will start building a > > v2.6.30-rc3 kernel again for my fc11 host kernel as I do need SR-IOV at > > some point... :-) > > > > > 3. Your KVM version seems like kvm-85, you may provide some dmesg on host > > > side(I think you didn't use the KVM come along with kernel). > > > > Ok, now within the KVM guest running v2.6.29.2, I see the following: > > > > [ 2.669243] e1000e: Intel(R) PRO/1000 Network Driver - 0.3.3.3-k6 > > [ 2.672931] e1000e: Copyright (c) 1999-2008 Intel Corporation. > > [ 2.674932] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 10 > > [ 2.675181] 8139too Fast Ethernet driver 0.9.28 > > [ 2.676783] e1000e 0000:00:05.0: PCI INT A -> Link[LNKA] -> GSI 10 > > (level, high) -> IRQ 10 > > [ 2.678143] e1000e 0000:00:05.0: setting latency timer to 64 > > [ 2.679539] e1000e 0000:00:05.0: irq 24 for MSI/MSI-X > > [ 2.679603] e1000e 0000:00:05.0: irq 25 for MSI/MSI-X > > [ 2.679659] e1000e 0000:00:05.0: irq 26 for MSI/MSI-X > > [ 2.698039] FDC 0 is a S82078B > > [ 2.801673] 0000:00:05.0: eth0: (PCI Express:2.5GB/s:Width x1) > > 00:e0:81:c0:90:b2 > > [ 2.802811] 0000:00:05.0: eth0: Intel(R) PRO/1000 Network Connection > > [ 2.803697] 0000:00:05.0: eth0: MAC: 3, PHY: 8, PBA No: ffffff-0ff > > > > And the folllowing from /proc/interrupts inside of the KVM guest: > > > > 24: 117 0 0 0 0 0 > > 0 0 0 0 PCI-MSI-edge eth1-rx-0 25: > > 0 0 0 0 0 0 0 > > 0 0 0 PCI-MSI-edge eth1-tx-0 26: 2 > > 0 0 0 0 0 0 > > 0 0 0 PCI-MSI-edge eth1 > > > > ethtool eth1 reports that Link is detected, but I am still unable to get > > a dhcp to work. > > It's a little strange that I checked all the log you posted, but can't find > anything suspicious...(Except you got a MCE log in your dmesg, but I don't > think it would relate to this). > > You also already have interrupts in the guest for eth1-rx-0 and eth1, so at > least part of interrupts can be delivered to the guest. > > You can try to connect the port to another NIC port directly. Set fixed ip for > each, then ping each other. > > You can also try to disable MSI-X capability in QEmu. Just using "#if > 0/#endif" to wrap "#ifdef KVM_CAP_DEVICE_MSIX/#endif" in > hw/assigned_device_pci_cap_init(). Then the device would use MSI. > > If I am lucky enough to find a 82574L card by hand, I would give it a try... > > -- > regards > Yang, Sheng > Greetings Sheng, So I updated my FC11 Host to kernel v2.6.30-rc3 (and enabled ext4 of course) and rebuilt the kvm-85 source kernel module and qemu-system-x86_64 and I am now able to get dhcp and IP ops from the 02:00.0 device on my IOH-5520 board with the KVM guest using a v2.6.29.2 kernel!! Everything is looking good with the v2.6.29.2, but after a quick reboot back into my v2.6.30-rc3 KVM guest kernel build e1000e it looks like I am unable to get dhcp. Rebooting back into KVM Guest kernel v2.6.29.2 brings the pci-stub assigned e1000e 82574L assigned with dhcp and everything looks good! :-) I will keep poking at the v2.6.30-rc KVM guests (I am going to do a complete rebuild) and see if it does not start move IP packets as well.. Thanks for all of your help in getting setup! --nab -- 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
