linux-kernel - Re: [RFC PATCH 3/6] iommu/amd: Introduce Guest-ID struct amd_iommu

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Message-ID: <09d009cd-6366-4372-9534-4c637c56b3d7@amd.com>
Date: Fri, 5 Jan 2024 20:39:56 +0700
From: "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To: "Tian, Kevin" <kevin.tian@...el.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
 "joro@...tes.org" <joro@...tes.org>, "jgg@...dia.com" <jgg@...dia.com>
Cc: "Liu, Yi L" <yi.l.liu@...el.com>,
 "nicolinc@...dia.com" <nicolinc@...dia.com>,
 "eric.auger@...hat.com" <eric.auger@...hat.com>,
 "vasant.hegde@....com" <vasant.hegde@....com>,
 "jon.grimm@....com" <jon.grimm@....com>,
 "santosh.shukla@....com" <santosh.shukla@....com>,
 "Dhaval.Giani@....com" <Dhaval.Giani@....com>,
 "pandoh@...gle.com" <pandoh@...gle.com>,
 "loganodell@...gle.com" <loganodell@...gle.com>
Subject: Re: [RFC PATCH 3/6] iommu/amd: Introduce Guest-ID struct
 amd_iommu_vminfo

Hi Kevin

On 12/15/2023 2:35 PM, Tian, Kevin wrote:
>> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
>> Sent: Wednesday, December 13, 2023 12:02 AM
>>
>> AMD HW-vIOMMU feature requires IOMMU driver to specify a unique 16-bit
>> Guest ID (GID) for each VM. This ID is used to index into various
>> data structures for configuring the hardware.
>>
>> Introduce amd_iommu_vminfo_hash hashtable to store per-vm
>> configuration,
>> which uses 16-bit GID as a hash key along with helper functions.
>>
> 
> somehow it's unclear to me whether this series is only for hw
> supporting vf or broader hw supporting nested capability. for
> the latter case is GID still necessary?

I am restructuring the series and might be moving GID stuff until later 
when introduce broader hw support for AMD vIOMMU.

Suravee