On Mon, Aug 14, 2017 at 9:34 PM, Brett Peckinpaugh <b...@erylflynn.com> wrote:
> Name one, I have looked. Everyone I saw was an old pci e version. > What makes the onboard audio device special vs a plugin pci-e board? What makes the graphics card audio special vs a pci-e board? If the host driver doesn't work well with the iommu, you can often work around that with iommu=pt to enable passthrough mode. However, when that device is assigned to a VM, the guest driver can be completely iommu incompetent. I won't say there aren't devices out there that still manage to do the wrong thing, but I also don't think pci-e audio cards can be claimed to be a problem class of devices. It's news to me if they are. I would hope that any pci-e sound card with mainline kernel drivers does dma sufficiently correctly to work with an iommu. Most onboard and graphics card sound chips use snd_intel_hda on the host and work well with iommu, find a plugin card that uses that driver.
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