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From: Paul Menzel <pmenzel@molgen.mpg.de>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Alex Deucher <alexdeucher@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, X86 ML <x86@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	amd-gfx@lists.freedesktop.org, Borislav Petkov <bp@alien8.de>
Subject: Re: `AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y` causes AMDGPU to fail on Ryzen: amdgpu: SME is not compatible with RAVEN
Date: Mon, 11 Oct 2021 15:52:14 +0200	[thread overview]
Message-ID: <139ed784-d622-b0d2-3650-736b42e624f0@molgen.mpg.de> (raw)
In-Reply-To: <87d93314-ba3e-464f-d051-84a8de674b06@amd.com>

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?


Kind regards,

Paul

  reply	other threads:[~2021-10-11 13:54 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-05 14:29 `AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y` causes AMDGPU to fail on Ryzen: amdgpu: SME is not compatible with RAVEN Paul Menzel
2021-10-05 14:38 ` Borislav Petkov
2021-10-06  6:27   ` Paul Menzel
2021-10-05 14:48 ` Alex Deucher
2021-10-06  9:42   ` Borislav Petkov
2021-10-06 13:23     ` Alex Deucher
2021-10-06 13:46       ` Borislav Petkov
2021-10-06 14:01       ` Tom Lendacky
2021-10-06 17:48         ` Borislav Petkov
2021-10-06 18:10           ` Alex Deucher
2021-10-06 18:21             ` Alex Deucher
2021-10-06 19:32               ` Borislav Petkov
2021-10-07  6:14                 ` Christian König
2021-10-06 18:21             ` Borislav Petkov
2021-10-06 18:36               ` Alex Deucher
2021-10-06 19:34                 ` Borislav Petkov
2021-10-06 21:39                 ` Tom Lendacky
2021-10-11 13:05           ` Paul Menzel
2021-10-11 13:11             ` Borislav Petkov
2021-10-11 13:27               ` Tom Lendacky
2021-10-11 13:52                 ` Paul Menzel [this message]
2021-10-11 13:58                   ` Tom Lendacky
2021-10-11 14:21                     ` Paul Menzel
2021-10-11 14:28                       ` Tom Lendacky
2021-10-11 14:32                       ` Alex Deucher
2021-10-11 16:03                         ` [PATCH -v2] x86/Kconfig: Do not enable AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT automatically Borislav Petkov
2021-10-11 16:05                           ` Alex Deucher
2021-10-11 16:29                           ` Tom Lendacky
2021-10-11 17:18 ` [tip: x86/urgent] " tip-bot2 for Borislav Petkov

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