Hi John,
On 4/3/19 9:49 AM, John Sucaet wrote:
Thanks, Anatoly.
Maxime, could you enlighten me a bit? I basically would like to know
whether I should be able to make my 32-bit dpdk application work with
virtio-pci-net and vfio-pci (with a 64-bit kernel), or if I should do
the effort to port to 64-bit (which I would like to avoid for now).
I think that it should work, but that's not something I have tried.
I will try to reproduce it this week to get a precise idea of what is
going wrong.
Thanks for reporting the issue,
Maxime
Thank you
John
On 04/02/2019 03:38 PM, Burakov, Anatoly wrote:
On 02-Apr-19 11:38 AM, John Sucaet wrote:
Hi Anatoly,
As you said: There's no reason to use igb_uio, ever!
That was partly tongue in cheek, but point taken :)
I would like to ask whether vfio-pci with or without vIOMMU
should/could work for virtio-pci net devices in the case of a 32-bit
dpdk application, on a 64-bit kernel (4.9) inside a guest VM
(qemu-2.10.2-1.fc27)?
I tried both a 64-bit and a 32-bit version of the same application,
but only in the case of the 64-bit application, the port was found by
eal. The 32-bit application gave errors like:
EAL: pci_map_resource(): cannot mmap(16, 0xf4a01000, 0x4000, 0x0):
Invalid argument (0xffffffff)
EAL: Failed to map pci BAR4
EAL: 0000:00:02.0 mapping BAR4 failed: Invalid argument
EAL: Can't write to PCI bar (0) : offset (12)
EAL: Can't read from PCI bar (0) : offset (12)
EAL: Can't read from PCI bar (0) : offset (12)
EAL: Can't write to PCI bar (0) : offset (12)
EAL: Can't read from PCI bar (0) : offset (12)
EAL: Can't write to PCI bar (0) : offset (12)
EAL: Can't read from PCI bar (0) : offset (0)
EAL: Can't write to PCI bar (0) : offset (4)
EAL: Can't write to PCI bar (0) : offset (14)
EAL: Can't read from PCI bar (0) : offset (14)
EAL: Can't read from PCI bar (0) : offset (1a)
EAL: Can't read from PCI bar (0) : offset (1c)
EAL: Can't write to PCI bar (0) : offset (e)
EAL: Can't read from PCI bar (0) : offset (c)
virtio_init_queue(): virtqueue size is not powerof 2
EAL: Requested device 0000:00:02.0 cannot be used
Maybe you have an idea what went wrong here?
By preference, I would like to continue to use the 32-bit application
which worked fine with the igb_uio driver.
Unfortunately, i am not very familiar with virtio and wouldn't know
whether it's supposed to work under these conditions. Perhaps Maxime
would be of more help here (CC'd).
Thanks
John
On 03/12/2019 11:57 AM, Burakov, Anatoly wrote:
On 12-Mar-19 10:20 AM, Bruce Richardson wrote:
On Tue, Mar 12, 2019 at 05:54:39PM +0800, Jason Wang wrote:
On 2019/3/12 下午5:42, Thanneeru Srinivasulu wrote:
Thanks Bruce..
On Tue, Mar 12, 2019 at 3:08 PM Bruce Richardson
<bruce.richard...@intel.com> wrote:
On Tue, Mar 12, 2019 at 10:57:55AM +0530, Thanneeru Srinivasulu
wrote:
Hi Everyone.
I did attached pice to Guest VM using vfio-pci with qemu
command, and then
tried binding the pcie bdf with vfio-pci, observing binding
failure with
vfio-pci.
Where as when tryied with igb_uio, everything works fine.
Does Binding with vfio-pci is supported inside VM/guest?
vfio support requires the presence of an IOMMU, and you
generally don't
have an IOMMU available in a VM.
/Bruce
Actually, Qemu support vIOMMU + VFIO in guest[1], all you need is
to add a
intel IOMMU and enabling caching mode.
Thanks
[1]
https://www.lfasiallc.com/wp-content/uploads/2017/11/Device-Assignment-with-Nested-Guests-and-DPDK_Peter-Xu.pdf
Thanks for the info.
/Bruce
One more thing: even without vIOMMU, VFIO has no-IOMMU mode which
can be enabled (for a recent-enough kernel). This will make VFIO
work even in cases where the guest doesn't have IOMMU emulation.
See? There's no reason to use igb_uio, ever! :D
