[geeks] vmware, usb, and hubs

[Brian Dunbar]

Interesting;

Intel VT-d is enabled in BIOS, and VMware does appear to 'see the USB
devices - when I configure 'DirectPath I/O Configuration I can add the two
USB2 enhanced host controller' devices.

And when I disable VT-d in BIOS VMware tells me 'host does not support
passthrough'.

Again - thanks for the tip.  I guess it's down to a problem with the guest
vm.


On Mon, Aug 11, 2014 at 12:08 PM, Brian Dunbar <brian.dunbar at gmail.com>
wrote:

> >  your hardware needs to have an IOMMU aka "Intel VT-d.
>
> Ah ... looking in the manual it's a BIOS option I need to enable.  Thanks!
>
>
> On Fri, Aug 8, 2014 at 7:08 PM, Andrew Jones <andrew at jones.ec> wrote:
>
>> On 08/08/2014 05:28 PM, Andrew Jones wrote:
>>
>>> On Aug 8, 2014, at 4:12 PM, Brian Dunbar <brian.dunbar at gmail.com> wrote:
>>>>
>>>> Hypervisor can 'see' all the devices.  One can be attached to the guest
>>>> VM,
>>>> no problem.  Two cannot: it's just not there.
>>>>
>>>> I thought DirectPath might be a solution - told vmware to put Two as a
>>>> DirectPath device.   When I add that PCI device to the guest it halts at
>>>> boot and tells me ..
>>>>
>>>> *Failed to register the device pciPassthru0 for 0:26.0 due to
>>>> unavailable
>>>> hardware or software support*
>>>>
>>>>
>>> Does your software have an IOMMU?
>>>
>>
>> This was typed on my phone, so it was both short and contained a serious
>> typo.
>>
>> For PCI device passthrough and similar shennanigans to work, your
>> hardware needs to have an IOMMU aka "Intel VT-d."  Most servers have IOMMUs.
>>
>> It's pretty uncommon in desktops and laptops.
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>
>
>
> --
> Brian Dunbar
>
> "Display some adaptability"
>



-- 
Brian Dunbar

"Display some adaptability"