[vfio-users] Requesting USB Card Quad Bus advice

[Alex Williamson]

On Tue, Nov 7, 2017 at 8:32 AM, Steve Freitas <sflist at ihonk.com> wrote:

> 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> 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/
>>
>> 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?
>

Send 'sudo lspci -vvv'
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