Messages in this thread | | | Date | Thu, 23 Jun 2022 12:41:00 +0100 | Subject | Re: [PATCH v2] iommu/dma: Add config for PCI SAC address trick | From | Robin Murphy <> |
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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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