Claudia: > December 26, 2019 12:59 PM, "awokd' via qubes-users" > <[email protected]> wrote: > >> Claudia: >> >> TLDR; check bottom of https://community.amd.com/thread/241650, looks >> like there was a recently released related updated. Not sure if >> applicable to your situation. > > Thanks for the link! I'm not sure if it affects me or not. I did install a > Dell BIOS update dated March 2019, so it sounds like that could have > contained this Agesa update. So downgrading might fix the grouping issue, but > this update also contained an "urgent" security update which I'd have to look > into before downgrading.
I'd assumed AGESA version numbers were from a common code base, but apparently not. The one mentioned in that thread was released around Oct. 2019, but may not be applicable to your hardware. They also don't specifically reference USB controller grouping in that thread, so it might do nothing for you even if it is applicable. > I sort of blame Xen for not enforcing IOMMU grouping, especially considering > that it hides that > info from the OS. KVM does enforce IOMMU grouping rules, so I don't see why > Xen wouldn't. Xen > leaves it up to the user software to be careful what it passes where, but > that's kind of hard when > you don't have /sys/kernel/iommu_groups for a hint. I am a bit fuzzy here too. It seems like if ACS is working correctly, you can get better granularity within IOMMU groups. It would be disappointing if it does not on recently released hardware. In your case, the USB controller appears as a different function of the same PCI device, which could be the case from a hardware perspective. This is even worse for a passthrough scenario than IOMMU grouping. There is a Realtek controller that often comes up on the list that makes people passthrough the SD card controller to their sys-net along with WIFI for the same reason. > This is a laptop, so I can't add any cards. This didn't used to be mutually exclusive. Thanks, Apple. -- - don't top post Mailing list etiquette: - trim quoted reply to only relevant portions - when possible, copy and paste text instead of screenshots -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/42654600-e501-aad9-f15b-a394d38b262f%40danwin1210.me.
