This patch series introduces initial support for the virtio-rtc device
(VIRTIO_ID_CLOCK), based on the OASIS virtio-rtc specification.

This implementation provides a single read-only clock that returns
the host's QEMU_CLOCK_HOST time in nanoseconds. It handles the
basic control and read requests necessary for the device to be
successfully probed and utilized by the upstream Linux virtio_rtc
driver.

I have verified this implementation using the virtio_rtc driver from
the Linux mainline. The device probes successfully, and the host time
can be correctly read from the guest using the following commands:

  $ cat /sys/class/rtc/rtc0/time
  $ cat /sys/class/rtc/rtc0/date
  $ hwclock -r -f /dev/rtc0

Kuan-Wei Chiu (2):
  standard-headers: Add virtio_rtc.h from Linux 7.0-rc1
  virtio-rtc: Add basic virtio-rtc support

 MAINTAINERS                                 |   7 +
 hw/virtio/Kconfig                           |   5 +
 hw/virtio/meson.build                       |   2 +
 hw/virtio/virtio-rtc-pci.c                  |  65 ++++++
 hw/virtio/virtio-rtc.c                      | 190 ++++++++++++++++
 include/hw/virtio/virtio-rtc.h              |  22 ++
 include/standard-headers/linux/virtio_rtc.h | 237 ++++++++++++++++++++
 7 files changed, 528 insertions(+)
 create mode 100644 hw/virtio/virtio-rtc-pci.c
 create mode 100644 hw/virtio/virtio-rtc.c
 create mode 100644 include/hw/virtio/virtio-rtc.h
 create mode 100644 include/standard-headers/linux/virtio_rtc.h

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2.53.0.473.g4a7958ca14-goog