linux-kernel - Re: [PATCH v3 11/23] iommufd/viommu: Add IOMMUFD_CMD_VQUEUE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250507123103.GC90261@nvidia.com>
Date: Wed, 7 May 2025 09:31:03 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Vasant Hegde <vasant.hegde@....com>
Cc: Nicolin Chen <nicolinc@...dia.com>, kevin.tian@...el.com,
	corbet@....net, will@...nel.org, bagasdotme@...il.com,
	robin.murphy@....com, joro@...tes.org, thierry.reding@...il.com,
	vdumpa@...dia.com, jonathanh@...dia.com, shuah@...nel.org,
	jsnitsel@...hat.com, nathan@...nel.org, peterz@...radead.org,
	yi.l.liu@...el.com, mshavit@...gle.com, praan@...gle.com,
	zhangzekun11@...wei.com, iommu@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kselftest@...r.kernel.org, patches@...ts.linux.dev,
	mochs@...dia.com, alok.a.tiwari@...cle.com,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: Re: [PATCH v3 11/23] iommufd/viommu: Add IOMMUFD_CMD_VQUEUE_ALLOC
 ioctl

On Wed, May 07, 2025 at 01:11:43PM +0530, Vasant Hegde wrote:
>   -  MMIO Offset 0018h IOMMU Control Register
>      EventLogEn: Event log enable
>        * When guest sets this bit, qemu will trap and will send queue_alloc
>        * When guest disables this bit, qemu will trap and send vqueue_destroy
> 
>      This part is fine.

Ok

>      EventIntEn: Event log interrupt enable
>        * When guest sets this bit, qemu will trap
>        * this needs to be communicated to Host so that we can program VF Control
> BAR and enable the interrupt

This sounds like modifying the vqueue? Or maybe on the viommu?

>   - There is other bit "Completion wait interrupt enable"
>     This doesn't related to any buffer. Instead if we configure this for
> completion wait command it will generate interrupt.

This sounds like a modify on the VIOMMU object?

Jason