[vfio-users] Requesting USB Card Quad Bus advice
Steve Freitas
sflist at ihonk.com
Tue Nov 7 15:32:16 UTC 2017
On 11/07/2017 06:51 AM, Alex Williamson wrote:
> On Mon, Nov 6, 2017 at 11:58 PM, Steve Freitas <sflist at ihonk.com
> <mailto:sflist at ihonk.com>> wrote:
>
> On 11/06/2017 07:01 PM, Marcial Ascencio wrote:
>
> Hi guys, i was planning to buy USB card with at least 2 usb
> ports to assign each one to each VM, so I'm asking some advice
> about a brand that works soft with Linux VFIO. Thank you so
> much in advance!
>
>
> Hi Marcial,
>
> The Sonnet Allegro Pro worked great for me:
> https://amazon.com/Sonnet-Allegro-Pro-PCIe-card/dp/B00XPUHO10/
> <https://amazon.com/Sonnet-Allegro-Pro-PCIe-card/dp/B00XPUHO10/>
>
> I pass three of the four controllers through to different VMs, no
> ACS override necessary on my machine. VM reboots work without an
> issue. An earlier post on this mailing list indicated problems
> with this card with VM reboots, but that seems to have been
> resolved in more recent kernels. My host runs Ubuntu 17.04, kernel
> 4.10.
>
>
> Does the PCIe switch actually support ACS on the downstream ports for
> this card? I've seen some reports that certain switch configurations
> are incorrectly allowing separate iommu groups where they shouldn't.
> Fair warning, we're probably going to need to fix that and break some
> configurations that were incorrectly grouped. Thanks,
>
Yer breakin' my heart! :-)
Good question, how do I check that?
Steve
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