The non-RFC patch submisson¹ is just the basic platform support for Xen on KVM. This RFC series is phase 2, adding an internal XenStore and hooking up the PV back end drivers to that and the emulated grant tables and event channels.
With this, we can boot a Xen guest with PV disk, under KVM. Full support for migration isn't there yet because it's actually missing in the PV back end drivers in the first place (perhaps because upstream Xen doesn't yet have guest transparent live migration support anyway). I'm assuming that when the first round is merged and we drop the [RFC] from this set, that won't be a showstopper for now? I'd be particularly interested in opinions on the way I implemented serialization for the XenStore, by creating a GByteArray and then dumping it with VMSTATE_VARRAY_UINT32_ALLOC(). I may eventually attempt to make xs_node_walk() not actually recursive, if I can do so without my brain exploding. Since the first time the XenStore code was showed, I've stopped the XsNode from being an actual Object; that just made it larger for almost no benefit. ¹ https://lore.kernel.org/qemu-devel/20230216062444.2129371-1-dw...@infradead.org/ David Woodhouse (22): hw/xen: Add xenstore wire implementation and implementation stubs hw/xen: Add basic XenStore tree walk and write/read/directory support hw/xen: Implement XenStore watches hw/xen: Implement XenStore transactions hw/xen: Watches on XenStore transactions hw/xen: Implement core serialize/deserialize methods for xenstore_impl hw/xen: Add evtchn operations to allow redirection to internal emulation hw/xen: Add gnttab operations to allow redirection to internal emulation hw/xen: Pass grant ref to gnttab unmap operation hw/xen: Add foreignmem operations to allow redirection to internal emulation hw/xen: Move xenstore_store_pv_console_info to xen_console.c hw/xen: Use XEN_PAGE_SIZE in PV backend drivers hw/xen: Rename xen_common.h to xen_native.h hw/xen: Build PV backend drivers for CONFIG_XEN_BUS hw/xen: Only advertise ring-page-order for xen-block if gnttab supports it hw/xen: Hook up emulated implementation for event channel operations hw/xen: Add emulated implementation of grant table operations hw/xen: Add emulated implementation of XenStore operations hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore hw/xen: Implement soft reset for emulated gnttab hw/xen: Subsume xen_be_register_common() into xen_be_init() i386/xen: Initialize Xen backends from pc_basic_device_init() for emulation Paul Durrant (4): xenstore perms WIP hw/xen: Create initial XenStore nodes hw/xen: Add xenstore operations to allow redirection to internal emulation hw/xen: Avoid crash when backend watch fires too early accel/xen/xen-all.c | 69 +- hw/9pfs/meson.build | 2 +- hw/9pfs/xen-9p-backend.c | 32 +- hw/block/dataplane/meson.build | 2 +- hw/block/dataplane/xen-block.c | 12 +- hw/block/meson.build | 2 +- hw/block/xen-block.c | 12 +- hw/char/meson.build | 2 +- hw/char/xen_console.c | 57 +- hw/display/meson.build | 2 +- hw/display/xenfb.c | 32 +- hw/i386/kvm/meson.build | 1 + hw/i386/kvm/trace-events | 15 + hw/i386/kvm/xen_evtchn.c | 15 + hw/i386/kvm/xen_gnttab.c | 320 ++++- hw/i386/kvm/xen_gnttab.h | 1 + hw/i386/kvm/xen_xenstore.c | 1248 +++++++++++++++++- hw/i386/kvm/xenstore_impl.c | 1754 +++++++++++++++++++++++++ hw/i386/kvm/xenstore_impl.h | 63 + hw/i386/pc.c | 7 + hw/i386/pc_piix.c | 4 +- hw/i386/xen/xen-hvm.c | 8 +- hw/i386/xen/xen_platform.c | 7 +- hw/net/xen_nic.c | 25 +- hw/usb/meson.build | 2 +- hw/usb/xen-usb.c | 29 +- hw/xen/meson.build | 6 +- hw/xen/trace-events | 2 +- hw/xen/xen-bus-helper.c | 61 +- hw/xen/xen-bus.c | 408 +----- hw/xen/xen-hvm-common.c | 45 +- hw/xen/xen-legacy-backend.c | 307 ++--- hw/xen/xen-mapcache.c | 2 +- hw/xen/xen-operations.c | 487 +++++++ hw/xen/xen_devconfig.c | 4 +- hw/xen/xen_pt.c | 2 +- hw/xen/xen_pt.h | 2 +- hw/xen/xen_pt_config_init.c | 2 +- hw/xen/xen_pt_graphics.c | 1 - hw/xen/xen_pt_msi.c | 4 +- hw/xen/xen_pvdev.c | 63 +- hw/xenpv/xen_machine_pv.c | 6 +- include/hw/xen/xen-bus-helper.h | 25 +- include/hw/xen/xen-bus.h | 21 +- include/hw/xen/xen-hvm-common.h | 3 +- include/hw/xen/xen-legacy-backend.h | 27 +- include/hw/xen/xen.h | 24 +- include/hw/xen/xen_backend_ops.h | 399 ++++++ include/hw/xen/{xen_common.h => xen_native.h} | 75 +- include/hw/xen/xen_pvdev.h | 6 +- softmmu/globals.c | 4 + target/i386/kvm/xen-emu.c | 5 + tests/unit/meson.build | 1 + tests/unit/test-xs-node.c | 717 ++++++++++ 54 files changed, 5454 insertions(+), 978 deletions(-)
