linux-kernel - Re: [PATCH kernel v3 3/4] iommu/amd: Report SEV-TIO support

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Message-ID: <be439730-baf7-4c0f-86fd-cd84b8e34158@amd.com>
Date: Tue, 2 Dec 2025 10:27:32 +0530
From: Vasant Hegde <vasant.hegde@....com>
To: Alexey Kardashevskiy <aik@....com>, linux-kernel@...r.kernel.org
Cc: linux-crypto@...r.kernel.org, Tom Lendacky <thomas.lendacky@....com>,
 John Allen <john.allen@....com>, Herbert Xu <herbert@...dor.apana.org.au>,
 "David S. Miller" <davem@...emloft.net>, Ashish Kalra
 <ashish.kalra@....com>, Joerg Roedel <joro@...tes.org>,
 Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Borislav Petkov <bp@...e.de>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 Dan Williams <dan.j.williams@...el.com>, Jason Gunthorpe <jgg@...pe.ca>,
 Jerry Snitselaar <jsnitsel@...hat.com>, Gao Shiyuan <gaoshiyuan@...du.com>,
 Sean Christopherson <seanjc@...gle.com>, Kim Phillips
 <kim.phillips@....com>, Nikunj A Dadhania <nikunj@....com>,
 Michael Roth <michael.roth@....com>, Paolo Bonzini <pbonzini@...hat.com>,
 iommu@...ts.linux.dev, x86@...nel.org, linux-coco@...ts.linux.dev,
 Joerg Roedel <joerg.roedel@....com>
Subject: Re: [PATCH kernel v3 3/4] iommu/amd: Report SEV-TIO support

On 12/2/2025 8:14 AM, Alexey Kardashevskiy wrote:
> The SEV-TIO switch in the AMD BIOS is reported to the OS via
> the IOMMU Extended Feature 2 register (EFR2), bit 1.
> 
> Add helper to parse the bit and report the feature presence.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@....com>
> Acked-by: Joerg Roedel <joerg.roedel@....com>
> Link: https://patch.msgid.link/20251121080629.444992-4-aik@amd.com
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Reviewed-by: Vasant Hegde <vasant.hegde@....com>

-Vasant