* Yevgeny Petrilin (yevgenyp@xxxxxxxxxxxxxx) wrote: > Hello, > > I have the following issue: > Our HW device is SRIOV capable, I have tried passing through one of its Virtual Functions to a guest OS Running RH5.4 on the guest and the host. > The function is seen by "lspci" on the guest, however, when the HW tries to DMA the guest with the BDF of the VF, it sees all 0's. > Same operation succeeds when the virtual device runs on the host. > I have VT-d enabled in BIOS. Which kvm/qemu-kvm version? Newer ones will verify that you actually have VT-d fully enabled. Can you do 'dmesg | grep -e DMAR -e IOMMU' in the host and then we can verify that the IOMMU is functioning. > Is there is anything else I need to configure? You may need to configure VT-d support in your kernel, or manually enable it on the kernel commandline (intel_iommu=on). Oh...I see, RHEL5.4 host, yeah, you need intel_iommu=on. thanks, -chris -- 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
