This is a work-in-progress series with Hyper-V / VMBus device emulation. It's still very raw but it's testable so I'd appreciate feedback on whether the design is sound.
This stuff can also be seen at https://src.openvz.org/scm/up/qemu.git. Current status of the components included: * Hyper-V infrastructure (SynIC, VP_INDEX, events & messages, etc): - works, mostly submission-ready but needs addressing some issues * VMBus infrastructure (types, vmbus state machine, channel communication, etc): - works in main scenarios * SCSI controller: - works in main scenarios - supports multiqueue - iothread-unaware - performance competitive to virtio-scsi [*] - can be used for booting [**] * network interface: - basic operation only - no mac filtering - no offloads - no multiqueue - can be used for booting with limitations [***] Overall, it's in bad need for documentation, tests, proper patch split. Migration works but only tested very lightly. [*] basic measurements with fio rw=randread bs=4k iodepth=256 using null-co backend give o Windows guests: hv-scsi 10%-30% better than virtio-scsi o Linux guests: hv-scsi 10%-20% worse than virtio-scsi No performance analysis has been done yet. [**] patches for SeaBIOS and OVMF can be found at https://src.openvz.org/scm/up/seabios.git and https://src.openvz.org/scm/up/edk2.git [***] patches for iPXE can be found at https://src.openvz.org/scm/up/ipxe.git, limitations: - OVMF is yet unsupported - iPXE takes over VMBus state management from SeaBIOS so after iPXE failure to boot off hv-net booting off hv-scsi doesn't work Prerequisites: - KVM 4.14+ - HYPERV_EVENTFD support (in kvm/queue) is optional but recommended for better performance How to use: # qemu \ ... \ -machine ...,accel=kvm,vmbus \ -cpu ...,hv_vpindex,hv_synic,hv_stimer,(other hv_* recommended),kvm=off \ -nodefaults \ ... -device hv-scsi,(usual scsi props),(instanceid=<uuid> optional) \ -drive ... \ -device scsi-hd,... \ ... -netdev ... \ -device hv-net,(usual net props),(instanceid=<uuid> optional) \ ... Big kudos to Andrey Smetanin and Evgeny Yakovlev for their research and prototyping. Andrey Smetanin (1): i386: Hyper-V VMBus ACPI DSDT entry Evgeny Yakovlev (1): vmbus: build configuration Roman Kagan (32): hyperv: ensure VP index equal to QEMU cpu_index hyperv_testdev: refactor for readability hyperv: cosmetic: g_malloc -> g_new hyperv: synic: only setup ack notifier if there's a callback hyperv: allow passing arbitrary data to sint ack callback hyperv: address HvSintRoute by X86CPU pointer hyperv: make HvSintRoute reference-counted hyperv: qom-ify SynIC hyperv: block SynIC use in QEMU in incompatible configurations hyperv: make overlay pages for SynIC hyperv: add synic message delivery hyperv: add synic event flag signaling hyperv: process SIGNAL_EVENT hypercall hyperv: process POST_MESSAGE hypercall hyperv_testdev: add SynIC message and event testmodes hyperv: update copyright notices [not to commit] import HYPERV_EVENTFD stuff from kernel hyperv: add support for KVM_HYPERV_EVENTFD vmbus: add vmbus protocol definitions vmbus: vmbus implementation i386: en/disable vmbus by a machine property scsi: add Hyper-V/VMBus SCSI protocol definitions scsi: add Hyper-V/VMBus SCSI controller hv-scsi: limit the number of requests per notification tests: hv-scsi: add start-stop test net: add RNDIS definitions net: add Hyper-V/VMBus network protocol definitions net: add Hyper-V/VMBus net adapter hv-net: add .bootindex support loader: allow arbitrary basename for fw_cfg file roms vmbus: add support for rom files hv-net: define default rom file name configure | 11 + Makefile.objs | 1 + hw/net/hvnet-proto.h | 1161 +++++++++++++++++++ hw/net/rndis.h | 391 +++++++ hw/scsi/hvscsi-proto.h | 150 +++ include/hw/i386/pc.h | 8 + include/hw/loader.h | 2 +- include/hw/vmbus/vmbus-proto.h | 222 ++++ include/hw/vmbus/vmbus.h | 109 ++ include/sysemu/kvm.h | 1 + linux-headers/linux/kvm.h | 14 + target/i386/hyperv.h | 40 +- accel/kvm/kvm-all.c | 15 + hw/core/loader.c | 43 +- hw/i386/acpi-build.c | 42 + hw/i386/pc.c | 34 + hw/i386/pc_piix.c | 5 + hw/i386/pc_q35.c | 5 + hw/misc/hyperv_testdev.c | 267 ++++- hw/net/hv-net.c | 1450 +++++++++++++++++++++++ hw/scsi/hv-scsi.c | 403 +++++++ hw/vmbus/vmbus.c | 2475 ++++++++++++++++++++++++++++++++++++++++ target/i386/hyperv.c | 681 ++++++++++- target/i386/kvm.c | 63 +- target/i386/machine.c | 9 + tests/hv-scsi-test.c | 57 + util/qemu-config.c | 4 + hw/Makefile.objs | 1 + hw/net/Makefile.objs | 2 + hw/scsi/Makefile.objs | 2 + hw/scsi/trace-events | 6 + hw/vmbus/Makefile.objs | 1 + hw/vmbus/trace-events | 8 + tests/Makefile.include | 3 + 34 files changed, 7561 insertions(+), 125 deletions(-) create mode 100644 hw/net/hvnet-proto.h create mode 100644 hw/net/rndis.h create mode 100644 hw/scsi/hvscsi-proto.h create mode 100644 include/hw/vmbus/vmbus-proto.h create mode 100644 include/hw/vmbus/vmbus.h create mode 100644 hw/net/hv-net.c create mode 100644 hw/scsi/hv-scsi.c create mode 100644 hw/vmbus/vmbus.c create mode 100644 tests/hv-scsi-test.c create mode 100644 hw/vmbus/Makefile.objs create mode 100644 hw/vmbus/trace-events -- 2.14.3
