Merge tag 'pull-or1k-20220904' of https://github.com/stffrdhrn/qemu into staging

OpenRISC updates for 7.2.0

Updates to add the OpenRISC virt plaform to QEMU. Highlights
include:

- New virt plaform with, virtio and pci bus support
- OpenRISC support for MTTCG
- Goldfish RTC device endianness is configurable now

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* tag 'pull-or1k-20220904' of https://github.com/stffrdhrn/qemu:
  docs/system: openrisc: Add OpenRISC documentation
  hw/openrisc: virt: pass random seed to fdt
  target/openrisc: Interrupt handling fixes
  target/openrisc: Enable MTTCG
  target/openrisc: Add interrupted CPU to log
  hw/openrisc: Initialize timer time at startup
  hw/openrisc: Add PCI bus support to virt
  hw/openrisc: Add the OpenRISC virtual machine
  goldfish_rtc: Add big-endian property
  target/openrisc: Fix memory reading in debugger
  hw/openrisc: Split re-usable boot time apis out to boot.c

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/docs/system/openrisc/virt.rst b/docs/system/openrisc/virt.rst
new file mode 100644
index 0000000000..2fe61ac942
--- /dev/null
+++ b/docs/system/openrisc/virt.rst
@@ -0,0 +1,50 @@
+'virt' generic virtual platform
+===============================
+
+The ``virt`` board is a platform which does not correspond to any
+real hardware; it is designed for use in virtual machines.
+It is the recommended board type if you simply want to run
+a guest such as Linux and do not care about reproducing the
+idiosyncrasies and limitations of a particular bit of real-world
+hardware.
+
+Supported devices
+-----------------
+
+ * PCI/PCIe devices
+ * 8 virtio-mmio transport devices
+ * 16550A UART
+ * Goldfish RTC
+ * SiFive Test device for poweroff and reboot
+ * SMP (OpenRISC multicore using ompic)
+
+Boot options
+------------
+
+The virt machine can be started using the ``-kernel`` and ``-initrd`` options
+to load a Linux kernel and optional disk image. For example:
+
+.. code-block:: bash
+
+  $ qemu-system-or1k -cpu or1220 -M or1k-sim -nographic \
+        -device virtio-net-device,netdev=user -netdev user,id=user,net=10.9.0.1/24,host=10.9.0.100 \
+        -device virtio-blk-device,drive=d0 -drive file=virt.qcow2,id=d0,if=none,format=qcow2 \
+        -kernel vmlinux \
+        -initrd initramfs.cpio.gz \
+        -m 128
+
+Linux guest kernel configuration
+""""""""""""""""""""""""""""""""
+
+The 'virt_defconfig' for Linux openrisc kernels includes the right drivers for
+the ``virt`` machine.
+
+Hardware configuration information
+""""""""""""""""""""""""""""""""""
+
+The ``virt`` board automatically generates a device tree blob ("dtb") which it
+passes to the guest. This provides information about the addresses, interrupt
+lines and other configuration of the various devices in the system.
+
+The location of the DTB will be passed in register ``r3`` to the guest operating
+system.