On Thu, Feb 1, 2018 at 2:10 AM, Burakov, Anatoly <anatoly.bura...@intel.com> wrote:
> On 31-Jan-18 9:51 PM, Ravi Kerur wrote: > >> >> Hi Anatoly, >> >> Thanks. I am following wiki link below which uses vIOMMU with DPDK as a >> use-case and instantiate VM as specified with Q35 chipset in Qemu. >> >> https://wiki.qemu.org/Features/VT-d >> >> Qemu-version is 2.11 >> Host kernel 4.9 >> Guest kernel 4.4 >> >> I can only guess that guest kernel needs an upgrade in my setup to work >> correctly, if versions on my setup rings a bell on not having support >> kindly let me know. >> >> When 'modprobe vfio enable_unsafe_noiommu_node=Y' is executed on guest I >> get following error >> ... >> vfio: unknown parameter 'enable_unsafe_noiommu_node' ignored >> ... >> >> in guest. >> >> Thanks. >> > > AFAIK kernel 4.4 should have noiommu mode - it was introduced in 3.1x days. > However, in order for that to work, kernel also has to be built with this > mode enabled. My guess is, whoever is the supplier of your kernel, did not > do that. You should double-check the kernel configuration of your > distribution. > > However, if you have vIOMMU in QEMU, you shouldn't need noiommu mode - > "regular" vfio should work fine. noiommu mode should only be needed if you > know you don't have IOMMU enabled in your kernel, and even if you can't > enable it, you can still use igb_uio. > > Hi Anatoly, Do you suggest I take this discussion to kvm/qemu mailing list as I am not sure which component has the issue? I check dmesg for BIOS physical memory map and address reported as fault by DMAR is reported by BIOS as usable on both host and vm. [ 4539.597737] DMAR: [DMA Read] Request device [04:10.0] fault addr *33a128000 *[fault reason 06] PTE Read access is not set dmesg | grep BIOS [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009afff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009b000-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007938afff] usable [ 0.000000] BIOS-e820: [mem 0x000000007938b000-0x000000007994bfff] reserved [ 0.000000] BIOS-e820: [mem 0x000000007994c000-0x000000007999cfff] ACPI data [ 0.000000] BIOS-e820: [mem 0x000000007999d000-0x0000000079f7dfff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x0000000079f7e000-0x000000007bd37fff] reserved [ 0.000000] BIOS-e820: [mem 0x000000007bd38000-0x000000007bd38fff] usable [ 0.000000] BIOS-e820: [mem 0x000000007bd39000-0x000000007bdbefff] reserved [ 0.000000] BIOS-e820: [mem 0x000000007bdbf000-0x000000007bffffff] usable [ 0.000000] BIOS-e820: [mem 0x000000007c000000-0x000000008fffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed44fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved [* 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000407fffffff] usable* Kindly let me know your inputs. Thanks. -- > Thanks, > Anatoly >
