libkrunfw: Add virtio-rtc driver support#121
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slp merged 2 commits intocontainers:mainfrom May 5, 2026
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April 29, 2026 12:39
Backport virtio-rtc driver from upstream Linux kernel to enable RTC and PTP clock support in libkrun guests. Added 4 upstreamed patches on virtio_rtc Enabled virtio_rtc kernel configs This allows libkrun guests to: - Access host time via /dev/rtc* (RTC class driver) - Access PTP clocks via /dev/ptp* (for time synchronization) - Set alarms to wake from suspend - Use cross-timestamping on ARM platforms The driver has been tested with rust-vmm vhost-device-rtc backend. Upstream commits: - 0623c759276885c3ae88197ba6fb5c9c6ba8612f - 9a17125a18f9ae1e1233a8e2d919059445b9d6fd - e2ef16757bbe1d4566093179944e9ebe730b2701 - 9d4f22fd563e0cd02e8448e84d057e7c0132a586 Upstream patch author: Peter Hilber <quic_philber@quicinc.com> Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Add compatibility patch to backport virtio-rtc driver to kernel 6.12. Fix API differences: - Replace secs_to_jiffies(60) with msecs_to_jiffies(60 * 1000) (secs_to_jiffies was introduced after 6.12) - Replace devm_device_init_wakeup(dev) with device_init_wakeup(dev, true) (devm_device_init_wakeup was introduced after 6.12) Both changes provide equivalent functionality and allow the driver to build cleanly on kernel 6.12.76. Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
dorindabassey
requested review from
MatiasVara,
slp and
tylerfanelli
as code owners
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Backport virtio-rtc driver from upstream Linux kernel
to enable RTC and PTP clock support in libkrun guests.
Added 4 upstreamed patches on virtio_rtc
Enabled virtio_rtc kernel configs
This allows libkrun guests to:
The driver has been tested with rust-vmm vhost-device-rtc backend.
Upstream commits:
Upstream patch author: Peter Hilber quic_philber@quicinc.com