linux-kernel - Re: [RFC PATCH 00/30] Host side (KVM/VFIO/IOMMUFD) support for TDISP using TSM

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: <20250602133727.GD233377@nvidia.com>
Date: Mon, 2 Jun 2025 10:37:27 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Xu Yilun <yilun.xu@...ux.intel.com>
Cc: kvm@...r.kernel.org, sumit.semwal@...aro.org, christian.koenig@....com,
	pbonzini@...hat.com, seanjc@...gle.com, alex.williamson@...hat.com,
	dan.j.williams@...el.com, aik@....com, linux-coco@...ts.linux.dev,
	dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org, vivek.kasireddy@...el.com,
	yilun.xu@...el.com, linux-kernel@...r.kernel.org, lukas@...ner.de,
	yan.y.zhao@...el.com, daniel.vetter@...ll.ch, leon@...nel.org,
	baolu.lu@...ux.intel.com, zhenzhong.duan@...el.com,
	tao1.su@...el.com, linux-pci@...r.kernel.org, zhiw@...dia.com,
	simona.vetter@...ll.ch, shameerali.kolothum.thodi@...wei.com,
	aneesh.kumar@...nel.org, iommu@...ts.linux.dev,
	kevin.tian@...el.com
Subject: Re: [RFC PATCH 00/30] Host side (KVM/VFIO/IOMMUFD) support for TDISP
 using TSM

On Thu, May 29, 2025 at 01:34:43PM +0800, Xu Yilun wrote:

> This series has 3 sections:

I really think this is too big to try to progress, even in RFC
form.
 
> Patch 1 - 11 deal with the private MMIO mapping in KVM MMU via DMABUF.
> Leverage Jason & Vivek's latest VFIO dmabuf series [3], see Patch 2 - 4.
> The concern for get_pfn() kAPI [4] is not addressed so are marked as
> HACK, will investigate later.

I would probably split this out entirely into its own topic. It
doesn't seem directly related to TSM as KVM can use DMABUF for good
reasons independently .

> Patch 12 - 22 is about TSM Bind/Unbind/Guest request management in VFIO
> & IOMMUFD. Picks some of Shameer's patch in [5], see Patch 12 & 14.

This is some reasonable topic on its own after Dan's series
 
> Patch 23 - 30 is a solution to meet the TDX specific sequence
> enforcement on various device Unbind cases, including converting device
> back to shared, hot unplug, TD destroy. Start with a tdx_tsm driver
> prototype and finally implement the Unbind enforcement inside the
> driver. To be honest it is still awkward to me, but I need help.

Then you have a series or two to implement TDX using the infrastructure.

Jason