jacob jacob <opstkusr@xxxxxxxxx> writes: > I also see the following in dmesg in the VM. > > [ 0.095758] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff]) > [ 0.096006] acpi PNP0A03:00: ACPI _OSC support notification failed, > disabling PCIe ASPM > [ 0.096915] acpi PNP0A03:00: Unable to request _OSC control (_OSC > support mask: 0x08) IIRC, For OSC control, after BIOS is done with (whatever initialization it needs to do), it clears a bit so that the OS can take over. This message, you are getting is a sign of a bug in the BIOS (usually). But I don't know if this is related to your problem. Does "dmesg | grep -e DMAR -e IOMMU" give anything useful ? > [ 0.097072] acpi PNP0A03:00: fail to add MMCONFIG information, > can't access extended PCI configuration space under this bridge. > > Does this indicate any issue related to PCI passthrough? > > Would really appreciate any input on how to bebug this further. Did you get a chance to try a newer kernel ? > On Fri, Mar 13, 2015 at 10:08 AM, jacob jacob <opstkusr@xxxxxxxxx> wrote: >>> So, it could be the i40e driver then ? Because IIUC, VFs use a separate >>> driver. Just to rule out the possibility that there might be some driver fixes that >>> could help with this, it might be a good idea to try a 3.19 or later upstream >>> kernel. >>> >> >> I tried with the latest DPDK release too (dpdk-1.8.0) and see the same issue. >> As mentioned earlier, i do not see any issues at all when running >> tests using either i40e or dpdk on the host itself. >> This is the reason why i am suspecting if it is anything to do with KVM/libvirt. >> Both with regular PCI passthrough and VF passthrough i see issues. It >> is always pointing to some issue with packet transmission. Receive >> seems to work ok. >> >> >> On Thu, Mar 12, 2015 at 8:02 PM, Bandan Das <bsd@xxxxxxxxxx> wrote: >>> jacob jacob <opstkusr@xxxxxxxxx> writes: >>> >>>> On Thu, Mar 12, 2015 at 3:07 PM, Bandan Das <bsd@xxxxxxxxxx> wrote: >>>>> jacob jacob <opstkusr@xxxxxxxxx> writes: >>>>> >>>>>> Hi, >>>>>> >>>>>> Seeing failures when trying to do PCI passthrough of Intel XL710 40G >>>>>> interface to KVM vm. >>>>>> 0a:00.1 Ethernet controller: Intel Corporation Ethernet >>>>>> Controller XL710 for 40GbE QSFP+ (rev 01) >>>>> >>>>> You are assigning the PF right ? Does assigning VFs work or it's >>>>> the same behavior ? >>>> >>>> Yes.Assigning VFs worked ok.But this had other issues while bringing down VMs. >>>> Interested in finding out if PCI passthrough of 40G intel XL710 >>>> interface is qualified in some specific kernel/kvm release. >>> >>> So, it could be the i40e driver then ? Because IIUC, VFs use a separate >>> driver. Just to rule out the possibility that there might be some driver fixes that >>> could help with this, it might be a good idea to try a 3.19 or later upstream >>> kernel. >>> >>>>>> From dmesg on host: >>>>>> >>>>>>> [80326.559674] kvm: zapping shadow pages for mmio generation wraparound >>>>>>> [80327.271191] kvm [175994]: vcpu0 unhandled rdmsr: 0x1c9 >>>>>>> [80327.271689] kvm [175994]: vcpu0 unhandled rdmsr: 0x1a6 >>>>>>> [80327.272201] kvm [175994]: vcpu0 unhandled rdmsr: 0x1a7 >>>>>>> [80327.272681] kvm [175994]: vcpu0 unhandled rdmsr: 0x3f6 >>>>>>> [80327.376186] kvm [175994]: vcpu0 unhandled rdmsr: 0x606 >>>>> >>>>> These are harmless and are related to unimplemented PMU msrs, >>>>> not VFIO. >>>>> >>>>> Bandan >>>> -- >>>> 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 -- 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
