mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Gong Shuai <gsh517025@gmail.com>
To: Jason Gunthorpe <jgg@ziepe.ca>, Gong Shuai <gong.shuai@sanechips.com.cn>
Cc: tanchi25@mails.ucas.ac.cn, alex@ghiti.fr,
	andrew.jones@oss.qualcomm.com, anup@brainfault.org,
	aou@eecs.berkeley.edu, atish.patra@linux.dev,
	fangyu.yu@linux.alibaba.com, iommu@lists.linux.dev,
	joro@8bytes.org, kevin.tian@intel.com,
	kvm-riscv@lists.infradead.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	palmer@dabbelt.com, pbonzini@redhat.com, pjw@kernel.org,
	robin.murphy@arm.com, seanjc@google.com,
	tomasz.jeznach@linux.dev, will@kernel.org,
	wu.fei9@sanechips.com.cn, zhao.qingye@sanechips.com.cn
Subject: Re: [RFC PATCH v2 9/9] iommu/riscv: Add riscv_iommu_attach_dev_nested
Date: Tue, 10 Nov 2026 21:47:05 +0800	[thread overview]
Message-ID: <42ce73bc-0fb5-46d9-bc45-34a5bef25cb2@gmail.com> (raw)
In-Reply-To: <20261110131658.GW663069@ziepe.ca>

Hi Jason,

On 11/10/2026 9:16 PM, Jason Gunthorpe wrote:
> On Tue, Nov 10, 2026 at 07:51:37PM +0800, Gong Shuai wrote:
> 
>>   2. Use the guest PSCID directly, but allocate a separate host GSCID for
>>      each vIOMMU.
> 
> This is the right model. The viommu should allocate the GSCID directly
> and keep it for the lifetime of the VM.

Thanks for the confirmation. The new version will use this scheme.

> 
>>   3. Share the GSCID and maintain a per-vIOMMU mapping from each guest
>>      PSCID to a host-allocated PSCID.
> 
> AMD is doing this because they don't have something like a GSCID.

Understood. This approach makes sense.

Thanks,
Shuai

> 
> Jason


  reply	other threads:[~2026-11-10 13:47 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-29  6:11 [RFC PATCH v2 0/9] iommu/riscv: Add nested translation (vIOMMU) support Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 1/9] iommu/riscv: Use DC.tc.V as the device context valid bit Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 2/9] iommufd: Add RISC-V IOMMU hwpt and vIOMMU types Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 3/9] iommufd: Add RISC-V IOMMU cache invalidation data type Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 4/9] iommu/riscv: Add vIOMMU object support Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 5/9] iommu/riscv: Add nested domain allocation Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 6/9] iommu/riscv: Add vIOMMU cache invalidation Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 7/9] iommufd: Add RISC-V IOMMU hardware info type Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 8/9] iommu/riscv: Add riscv_iommu_hw_info Gong Shuai
2026-10-29  6:11 ` [RFC PATCH v2 9/9] iommu/riscv: Add riscv_iommu_attach_dev_nested Gong Shuai
2026-11-05 14:49   ` Tan Chi
2026-11-05 18:32     ` Jason Gunthorpe
2026-11-10 12:01       ` Gong Shuai
2026-11-10 11:51     ` Gong Shuai
2026-11-10 13:16       ` Jason Gunthorpe
2026-11-10 13:47         ` Gong Shuai [this message]
2026-11-10 13:56       ` Tan Chi
2026-11-10 14:22         ` Gong Shuai

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=42ce73bc-0fb5-46d9-bc45-34a5bef25cb2@gmail.com \
    --to=gsh517025@gmail.com \
    --cc=alex@ghiti.fr \
    --cc=andrew.jones@oss.qualcomm.com \
    --cc=anup@brainfault.org \
    --cc=aou@eecs.berkeley.edu \
    --cc=atish.patra@linux.dev \
    --cc=fangyu.yu@linux.alibaba.com \
    --cc=gong.shuai@sanechips.com.cn \
    --cc=iommu@lists.linux.dev \
    --cc=jgg@ziepe.ca \
    --cc=joro@8bytes.org \
    --cc=kevin.tian@intel.com \
    --cc=kvm-riscv@lists.infradead.org \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=palmer@dabbelt.com \
    --cc=pbonzini@redhat.com \
    --cc=pjw@kernel.org \
    --cc=robin.murphy@arm.com \
    --cc=seanjc@google.com \
    --cc=tanchi25@mails.ucas.ac.cn \
    --cc=tomasz.jeznach@linux.dev \
    --cc=will@kernel.org \
    --cc=wu.fei9@sanechips.com.cn \
    --cc=zhao.qingye@sanechips.com.cn \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®