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Date: Mon, 11 Oct 2021 09:28:51 -0500 From: Tom Lendacky <thomas.lendacky@....com> To: Paul Menzel <pmenzel@...gen.mpg.de> Cc: Alex Deucher <alexdeucher@...il.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>, Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, LKML <linux-kernel@...r.kernel.org>, amd-gfx@...ts.freedesktop.org, Borislav Petkov <bp@...en8.de> Subject: Re: `AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y` causes AMDGPU to fail on Ryzen: amdgpu: SME is not compatible with RAVEN On 10/11/21 9:21 AM, Paul Menzel wrote: > Dear Tom, > > > Am 11.10.21 um 15:58 schrieb Tom Lendacky: >> On 10/11/21 8:52 AM, Paul Menzel wrote: > >>> 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... > > How can I check, why MEM_ENCRYPT is not working on my device despite the > IOMMU being enabled. I believe Alex already explained that. Your original message is from commit: ea68573d408f ("drm/amdgpu: Fail to load on RAVEN if SME is active") Thanks, Tom > > > Kind regards, > > Paul
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