Hey all,
This is the second revision of an accelerator implemented for the MSHV
kernel driver, exposing HyperV to Linux "Dom0" hosts. Thanks for the
helpful and quick feedback on the RFC patch. I attempted to address all
comments and we worked on fixing some of the limitation that we
identified in internal testing.
Best,
Magnus
Changelog:
v1 (RFC) => v2
- Addressed code review comments (style, consilidation).
- Rewrote the logic that handles overlap-in-userspace mappings to use
a static list of slots, inspired by the HVF accelerator code.
- Fixed a bug that wrote corrupt payload in a MSHV_SET_MSI_ROUTING
call, preventing vhost=on to work on tap network devices.
- Removed an erronous truncation of guest addresses to 32bit when
registering ioeventfd's using MSHV_IOEVENTFD. This resulted in
shadowing of low memory when ioevents were registered with
addresses beyond the 4gb barrier and thus unexpected "unmapped gpa"
vm exits in lower mem regions (impacting io performance).
- Fixed problem in which the MSI routing table was committed for KVM
KVM instead of MSHV in virtio-pci bus initialization.
- Added some "mshv" strings to the documentation.
- The above fixes removed a few limitation present in the previous
revision:
- Guest with machine type "pc" are booting (testing is still mostly
performed with q35)
- Tap network devices can be used with vhost=on option.
- Seabios can be used with >2.75G memory and multiple virtio-pci
devices
- I/O performance improvement as extranous MMIO vm exits are avoided
by registering ioevents with a correct address.
Notes:
- Changes to the mshv kernel driver that would allow to map regions of
userspace multiple times into the guest are still being discussed.
For now commit #26 will work around this limitation.
- A kernel ioctl "set_immediate_exit" will be added to the mshv driver
to avoid a race condition when handling signals (like ctrl-a x).
Magnus Kulke (27):
accel: Add Meson and config support for MSHV accelerator
target/i386/emulate: Allow instruction decoding from stream
target/i386/mshv: Add x86 decoder/emu implementation
hw/intc: Generalize APIC helper names from kvm_* to accel_*
include/hw/hyperv: Add MSHV ABI header definitions
accel/mshv: Add accelerator skeleton
accel/mshv: Register memory region listeners
accel/mshv: Initialize VM partition
accel/mshv: Register guest memory regions with hypervisor
accel/mshv: Add ioeventfd support
accel/mshv: Add basic interrupt injection support
accel/mshv: Add vCPU creation and execution loop
accel/mshv: Add vCPU signal handling
target/i386/mshv: Add CPU create and remove logic
target/i386/mshv: Implement mshv_store_regs()
target/i386/mshv: Implement mshv_get_standard_regs()
target/i386/mshv: Implement mshv_get_special_regs()
target/i386/mshv: Implement mshv_arch_put_registers()
target/i386/mshv: Set local interrupt controller state
target/i386/mshv: Register CPUID entries with MSHV
target/i386/mshv: Register MSRs with MSHV
target/i386/mshv: Integrate x86 instruction decoder/emulator
target/i386/mshv: Write MSRs to the hypervisor
target/i386/mshv: Implement mshv_vcpu_run()
target/i386/mshv: Handle HVMSG_X64_HALT vm exit
accel/mshv: Workaround for overlappig mem mappings
docs: Add mshv to documentation
accel/Kconfig | 3 +
accel/accel-irq.c | 95 ++
accel/meson.build | 3 +-
accel/mshv/irq.c | 369 +++++++
accel/mshv/mem.c | 415 ++++++++
accel/mshv/meson.build | 9 +
accel/mshv/mshv-all.c | 727 +++++++++++++
accel/mshv/msr.c | 372 +++++++
accel/mshv/trace-events | 29 +
accel/mshv/trace.h | 1 +
docs/devel/codebase.rst | 2 +-
hw/intc/apic.c | 9 +
hw/intc/ioapic.c | 20 +-
hw/virtio/virtio-pci.c | 21 +-
include/hw/hyperv/hvgdk.h | 19 +
include/hw/hyperv/hvhdk.h | 164 +++
include/hw/hyperv/hvhdk_mini.h | 105 ++
include/system/accel-irq.h | 26 +
include/system/mshv.h | 184 ++++
linux-headers/linux/mshv.h | 1038 ++++++++++++++++++
meson.build | 11 +
meson_options.txt | 2 +
qemu-options.hx | 16 +-
scripts/meson-buildoptions.sh | 3 +
scripts/update-linux-headers.sh | 2 +-
target/i386/cpu.h | 4 +-
target/i386/emulate/meson.build | 7 +-
target/i386/emulate/x86_decode.c | 31 +-
target/i386/emulate/x86_decode.h | 10 +
target/i386/emulate/x86_emu.c | 3 +-
target/i386/emulate/x86_emu.h | 1 +
target/i386/meson.build | 2 +
target/i386/mshv/meson.build | 8 +
target/i386/mshv/mshv-cpu.c | 1699 ++++++++++++++++++++++++++++++
target/i386/mshv/x86.c | 297 ++++++
35 files changed, 5671 insertions(+), 36 deletions(-)
create mode 100644 accel/accel-irq.c
create mode 100644 accel/mshv/irq.c
create mode 100644 accel/mshv/mem.c
create mode 100644 accel/mshv/meson.build
create mode 100644 accel/mshv/mshv-all.c
create mode 100644 accel/mshv/msr.c
create mode 100644 accel/mshv/trace-events
create mode 100644 accel/mshv/trace.h
create mode 100644 include/hw/hyperv/hvgdk.h
create mode 100644 include/hw/hyperv/hvhdk.h
create mode 100644 include/hw/hyperv/hvhdk_mini.h
create mode 100644 include/system/accel-irq.h
create mode 100644 include/system/mshv.h
create mode 100644 linux-headers/linux/mshv.h
create mode 100644 target/i386/mshv/meson.build
create mode 100644 target/i386/mshv/mshv-cpu.c
create mode 100644 target/i386/mshv/x86.c
--
2.34.1
