Messages in this thread | | | Subject | Re: `AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y` causes AMDGPU to fail on Ryzen: amdgpu: SME is not compatible with RAVEN | From | Tom Lendacky <> | Date | Mon, 11 Oct 2021 08:58:02 -0500 |
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On 10/11/21 8:52 AM, Paul Menzel wrote: > Dear Tom, > > > Am 11.10.21 um 15:27 schrieb Tom Lendacky: >> On 10/11/21 8:11 AM, Borislav Petkov wrote: >>> On Mon, Oct 11, 2021 at 03:05:33PM +0200, Paul Menzel wrote: >>>> I think, the IOMMU is enabled on the MSI B350M MORTAR, but otherwise, yes >>>> this looks fine. The help text could also be updated to mention problems >>>> with AMD Raven devices. >>> >>> This is not only about Raven GPUs but, as Alex explained, pretty much >>> about every device which doesn't support a 48 bit DMA mask. I'll expand >>> that aspect in the changelog. >> >> In general, non-GPU devices that don't support a 48-bit DMA mask work >> fine (assuming they have set their DMA mask appropriately). It really >> depends on whether SWIOTLB will be able to satisfy the memory >> requirements of the driver when the IOMMU is not enabled or in >> passthrough mode. Since GPU devices need/use a lot of memory, that >> becomes a problem. > > How can I check that?
How can you check what? 32-bit DMA devices? GPUs? I need a bit more information...
Thanks, Tom
> > > Kind regards, > > Paul
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