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Re: [PATCH] tools: Remove support for qemu-trad's battery reporting
- To: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 26 Mar 2025 14:05:37 +0000
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
- Delivery-date: Wed, 26 Mar 2025 14:05:47 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25/03/2025 5:41 pm, Alejandro Vallejo wrote:
> The way this undocumented feature works is via qemu-trad (who nobody
> uses anymore), by intercepting 3 magic PIOs. 0x88 is one of them, and
> it's probed by hvmloader as a means of detecting support for this (so,
> on qemu-upstream this check always fails). If hvmloader detects the
> feature, it appends an SSDT with AML inherited from some laptop ~20y
> ago. QEMU then communicates with a userspace daemon (xenpmd) via an
> undocumented xenstore key ("refreshbatterystatus") in order to report
> battery levels.
Any chance we can make this less undocumented, even if it is a note
saying "removed now" ?
>
> Seeing how no one uses, mantains or cares about qemu-trad anymore, rip
> it all out. The hvmloader check, the SSDT generation logic and xenpmd.
>
> Signed-off-by: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
> ---
> If this feature is truly wanted, it must be implemented in
> qemu-upstream. Ideally in a MUCH less roundabout way. And definitely
> without involving xenstore.
> ---
> .gitignore | 1 -
> tools/Makefile | 1 -
> tools/firmware/hvmloader/util.c | 7 -
> tools/libacpi/Makefile | 2 +-
> tools/libacpi/build.c | 9 -
> tools/libacpi/libacpi.h | 2 +-
> tools/libacpi/ssdt_pm.asl | 409 -------------------------
> tools/xenpmd/Makefile | 30 --
> tools/xenpmd/xenpmd.c | 525 --------------------------------
> 9 files changed, 2 insertions(+), 984 deletions(-)
> delete mode 100644 tools/libacpi/ssdt_pm.asl
> delete mode 100644 tools/xenpmd/Makefile
> delete mode 100644 tools/xenpmd/xenpmd.c
I'm tempted to summarily ack this based on diffstat alone.
Juergen has expressed an interest in finally purging qemu-trad in this
release cycle, which I agree with.
If we're going to do this, then I suggest we delete qemu-trad first.
Otherwise we are technically breaking something that someone might be using.
~Andrew
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