linux-kernel - Re: [PATCH v2 07/21] coco/tdx-host: Expose P-SEAMLDR information via sysfs

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Message-ID: <CAAhR5DGvDoCd_OZURF604LO0JOHoFjWM8Btk8uS_jzJVfk5J2w@mail.gmail.com>
Date: Fri, 31 Oct 2025 09:31:49 -0500
From: Sagi Shahar <sagis@...gle.com>
To: dan.j.williams@...el.com
Cc: Chao Gao <chao.gao@...el.com>, linux-coco@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, x86@...nel.org, reinette.chatre@...el.com, 
	ira.weiny@...el.com, kai.huang@...el.com, yilun.xu@...ux.intel.com, 
	vannapurve@...gle.com, paulmck@...nel.org, nik.borisov@...e.com, 
	Farrah Chen <farrah.chen@...el.com>, "Kirill A. Shutemov" <kas@...nel.org>, 
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v2 07/21] coco/tdx-host: Expose P-SEAMLDR information via sysfs

On Thu, Oct 30, 2025 at 6:05 PM <dan.j.williams@...el.com> wrote:
>
> Sagi Shahar wrote:
> > On Tue, Sep 30, 2025 at 9:55 PM Chao Gao <chao.gao@...el.com> wrote:
> > >
> > > TDX Module updates require userspace to select the appropriate module
> > > to load. Expose necessary information to facilitate this decision. Two
> > > values are needed:
> > >
> > > - P-SEAMLDR version: for compatibility checks between TDX Module and
> > >                      P-SEAMLDR
> > > - num_remaining_updates: indicates how many updates can be performed
> > >
> > > Expose them as tdx-host device attributes.
> > >
> > > Note that P-SEAMLDR sysfs nodes are hidden when INTEL_TDX_MODULE_UPDATE
> > > isn't enabled or when P-SEAMLDR isn't loaded by BIOS, both of which
> > > cause seamldr_get_info() to return NULL.
> > >
> > > Signed-off-by: Chao Gao <chao.gao@...el.com>
> > > Tested-by: Farrah Chen <farrah.chen@...el.com>
> > > ---
> > >  .../ABI/testing/sysfs-devices-faux-tdx-host   | 25 ++++++++
> > >  drivers/virt/coco/tdx-host/tdx-host.c         | 63 ++++++++++++++++++-
> > >  2 files changed, 87 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/ABI/testing/sysfs-devices-faux-tdx-host b/Documentation/ABI/testing/sysfs-devices-faux-tdx-host
> >
> > Trying to apply this patch locally fails because
> > sysfs-devices-faux-tdx-host does not exist. There are also conflicts
> > around drivers/virt/coco/tdx-host/tdx-host.c.
> >
> > I'm looking at the base commit specified in the cover letter [1] but
> > even the current head of the tsm/tdx tree [2] doesn't have the
> > sysfs-devices-faux-tdx-host file. Are there any other dependencies for
> > this series?
>
> I hit the same head scratcher, but then realized that Chao did say that
> you also need to apply:
>
> https://lore.kernel.org/linux-coco/20251001022309.277238-1-chao.gao@intel.com
>
> ...so:
>
> git checkout -b $branch 9332e088937f
> b4 shazam 20251001022309.277238-1-chao.gao@...el.com
> b4 shazam 20251001025442.427697-1-chao.gao@...el.com
>
> ...works for me.

Thanks, I missed that one. It's working now