On 2022-06-23 12:33, Joerg Roedel wrote:
On Wed, Jun 22, 2022 at 02:12:39PM +0100, Robin Murphy wrote:
Thanks for your bravery!
It already starts, with that patch I am getting:
xhci_hcd 0000:02:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT
domain=0x000f address=0xff00ffffffefe000 flags=0x0000]
In my kernel log. The device is an AMD XHCI controller and seems to
funciton normally after boot. The message disappears with
iommu.forcedac=0.
Need to look more into that...
Given how amd_iommu_domain_alloc() sets the domain aperture, presumably
the DMA address allocated was 0xffffffffffefe000? Odd that it gets bits
punched out in the middle rather than simply truncated off the top as I
would have expected :/
Robin.
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