lkml.org 
[lkml]   [2021]   [Oct]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: `AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y` causes AMDGPU to fail on Ryzen: amdgpu: SME is not compatible with RAVEN
From
Date
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

\
 
 \ /
  Last update: 2021-10-11 16:29    [W:0.059 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site