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Re: [Qemu-devel] iommu emulation
From: |
Bandan Das |
Subject: |
Re: [Qemu-devel] iommu emulation |
Date: |
Thu, 02 Mar 2017 17:20:19 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) |
Jintack Lim <address@hidden> writes:
> [cc Bandan]
>
> On Tue, Feb 21, 2017 at 5:33 AM, Jintack Lim <address@hidden>
> wrote:
>
>>
>>
>> On Wed, Feb 15, 2017 at 9:47 PM, Alex Williamson <
>> address@hidden> wrote:
...
>>
>
> I've tried another network device on a different machine. It has "Intel
> Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection" ethernet
> controller. I got the same problem of getting the network device
> initialization failure in L2. I think I'm missing something since I heard
> from Bandan that he had no problem to assign a device to L2 with ixgbe.
>
> This is the error message from dmesg in L2.
>
> [ 3.692871] ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver -
> version 4.2.1-k
> [ 3.697716] ixgbe: Copyright (c) 1999-2015 Intel Corporation.
> [ 3.964875] ixgbe 0000:00:02.0: HW Init failed: -12
> [ 3.972362] ixgbe: probe of 0000:00:02.0 failed with error -12
>
> I checked that L2 indeed had that device.
> address@hidden:~# lspci
> 00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM
> Controller
> 00:01.0 VGA compatible controller: Device 1234:1111 (rev 02)
> 00:02.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+
> Network Connection (rev 01)
Jintack, any progress with this ?
I am testing on a X540-AT2 and I see a different behavior. It appears
config succeeds but the driver keeps resetting the device due to a Tx
hang:
[ 568.612391 ] ixgbe 0000:00:03.0 enp0s3: tx hang 38 detected on queue 0,
resetting adapter
[ 568.612393 ] ixgbe 0000:00:03.0 enp0s3: initiating reset due to tx
timeout
[ 568.612397 ] ixgbe 0000:00:03.0 enp0s3: Reset adapter
This may be device specific but I think the actual behavior you see is
also dependent on the ixgbe driver in the guest. Are you on a recent
kernel ? Also, can you point me to the hack (by Peter) that you have
mentioned above ?
Thanks,
Bandan
> I'm describing steps I took, so if you notice something wrong, PLEASE let
> me know.
>
> 1. [L0] Check the device with lspci. Result is [1]
> 2. [L0] Unbind from the original driver and bind to vfio-pci driver
> following [2][3]
> 3. [L0] Start L1 with this script. [4]
> 4. [L1] L1 is able to use the network device.
> 5. [L1] Unbind from the original driver and bind to vfio-pci driver same as
> the step 2.
> 6. [L1] Start L2 with this script. [5]
> 7. [L2] Got the init failure error message above.
>
> [1] https://paste.ubuntu.com/24055745/
> [2] http://www.linux-kvm.org/page/10G_NIC_performance:_VFIO_vs_virtio
> [3] http://www.linux-kvm.org/images/b/b4/2012-forum-VFIO.pdf
> [4] https://paste.ubuntu.com/24055715/
> [5] https://paste.ubuntu.com/24055720/
>
> Thanks,
> Jintack
>
>
>>
>>
>>> Alex
>>>
>>>
>>
- Re: [Qemu-devel] iommu emulation,
Bandan Das <=