Below are some examples where `scripts/qmp/qmp-shell` (see the top comment
block in the script for usage) is used to issue the QMP commands.
-(1) Determine which CPU features are available for the `max` CPU type
- (Note, we started QEMU with qemu-system-aarch64, so `max` is
- implementing the ARMv8-A reference manual in this case)::
+1. Determine which CPU features are available for the `max` CPU type
+ (Note, we started QEMU with qemu-system-aarch64, so `max` is
+ implementing the ARMv8-A reference manual in this case)::
(QEMU) query-cpu-model-expansion type=full model={"name":"max"}
{ "return": {
-========================
+======================================
QEMU virtio-net standby (net_failover)
-========================
+======================================
This document explains the setup and usage of virtio-net standby feature which
is used to create a net_failover pair of devices.
-----------------
A virtio pmem device backed by a memory-backend-file can be created on
- the QEMU command line as in the following example:
+ the QEMU command line as in the following example::
- -object memory-backend-file,id=mem1,share,mem-path=./virtio_pmem.img,size=4G
- -device virtio-pmem-pci,memdev=mem1,id=nv1
+ -object memory-backend-file,id=mem1,share,mem-path=./virtio_pmem.img,size=4G
+ -device virtio-pmem-pci,memdev=mem1,id=nv1
- where:
- - "object memory-backend-file,id=mem1,share,mem-path=<image>, size=<image size>"
- creates a backend file with the specified size.
+ where:
- - "device virtio-pmem-pci,id=nvdimm1,memdev=mem1" creates a virtio pmem
- pci device whose storage is provided by above memory backend device.
+ - "object memory-backend-file,id=mem1,share,mem-path=<image>, size=<image size>"
+ creates a backend file with the specified size.
+
+ - "device virtio-pmem-pci,id=nvdimm1,memdev=mem1" creates a virtio pmem
+ pci device whose storage is provided by above memory backend device.
Multiple virtio pmem devices can be created if multiple pairs of "-object"
and "-device" are provided.
pmem device can be added via 'device_add'.
For example, the following commands add another 4GB virtio pmem device to
-the guest:
+the guest::
(qemu) object_add memory-backend-file,id=mem2,share=on,mem-path=virtio_pmem2.img,size=4G
(qemu) device_add virtio-pmem-pci,id=virtio_pmem2,memdev=mem2