hyperv - Use the new uio_hv_generic driver

Description:

When the hyperv package (currently flagged out of date) was bumped to 6.10, the hv_fcopy_daemon.service was removed - 1661c7ac

The Host to VM file copy feature is now managed by a new uio_hv_generic driver -

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/tools/hv/Makefile?id=82b0945ce2c2d636d5e893ad50210875c929f257
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/tools/hv?id=9b543419652917f048310d0863c47c107c26fb0c

@jelle also suggested that "since tools/kvm/kvm_stat/kvm_stat.service exists so no reason this service can't live upstream." Others have run into the same issue.

1. A new service for usr/bin/hv_fcopy_uio_daemon should be shipped now instead.
2. The wiki needs updating.
3. Current MS docs on the topic are outdated.

Additional info:

• package version(s): extra/hyperv 6.10-2 (linux-tools)
• link to report, if any: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/tools/hv/Makefile?id=82b0945ce2c2d636d5e893ad50210875c929f257

Steps to reproduce:

Install Arch linux under a Hyper-V vm with the hyperv package and even after reboot integrations services are missing.

added priority3-normal severity4-low statusunconfirmed labels

assigned to @freswa, @toolybird, and @gromit

added scopeenhancement statusconfirmed labels and removed statusunconfirmed label

assigned to @seblu and unassigned @freswa, @toolybird, and @gromit

@jelle also suggested that "since tools/kvm/kvm_stat/kvm_stat.service exists so no reason this service can't live upstream." Others have run into the same issue.

My suggestion is to send a kernel patch to have the required systemd service live in linux.git.

The breaking changes where made here by this patch, so if you want the ofifical docs to be fixed it's best to contact them. https://lore.kernel.org/all/1711788723-8593-6-git-send-email-ssengar@linux.microsoft.com/

(Or reply on the mailing list)

Got it, then it ought to include hv_kvp_daemon.service and hv_vss_daemon.service upstream too right?

# /usr/lib/systemd/system/hv_fcopy_uio_daemon.service
[Unit]
Description=Hyper-V file copy service (uio_hv_generic)
ConditionPathExists=/dev/vmbus/uio_hv_generic

[Service]
ExecStart=/usr/bin/hv_fcopy_uio_daemon -n

[Install]
WantedBy=multi-user.target