[PATCH v7 00/24] WHPX support for Arm

Mohamed Mediouni
2025-10-16T16:56:54Z

Link to branch: https://github.com/mediouni-m/qemu whpx (tag for this submission: whpx-v6)

Missing features:
- PSCI state sync with Hyper-V
- Interrupt controller save-restore
- SVE register sync

Known bugs:
- reboots when multiple cores are enabled are currently broken
- U-Boot still doesn't work (hangs when trying to parse firmware) but EDK2 does.

Note:

"target/arm/kvm: add constants for new PSCI versions" taken from the mailing list.

"accel/system: Introduce hwaccel_enabled() helper" taken from the mailing list, added here
as part of this series to make it compilable as a whole.

"hw/arm: virt: add GICv2m for the case when ITS is not available" present in both the HVF
vGIC and this series.

And another note:
Seems that unlike HVF there isn't direct correspondence between WHv registers and the actual register layout,
so didn't do changes there to a sysreg.inc.

Updates since v6:
- Rebasing
- Fixing a bug in the GICv3+GICv2m case for ACPI table generation
- getting rid of the slots infrastructure for memory management
- Place the docs commit right after the "cleanly fail on attempt to run GICv3+GICv2m on an unsupported config" one
as that's what switches ITS to a tristate.
- Fixing a build issue when getting rid of the arch-specific arm64 hvf-stub.

Updates since v5:
- Rebasing
- Address review comments
- Rework ITS enablement to a tristate
- On x86: move away from deprecated APIs to get/set APIC state

Updates since v4:
- Taking into account review comments
- Add migration blocker in the vGICv3 code due to missing interrupt controller save/restore
- Debug register sync

Updates since v3:
- Disabling SVE on WHPX
- Taking into account review comments incl:

- fixing x86 support
- reduce the amount of __x86_64__ checks in common code to the minimum (winhvemulation)
which can be reduced even further down the road.
- generalize get_physical_address_range into something common between hvf and whpx

Updates since v2:
- Fixed up a rebase screwup for whpx-internal.h
- Fixed ID_AA64ISAR1_EL1 and ID_AA64ISAR2_EL1 feature probe for -cpu host
- Switched to ID_AA64PFR1_EL1/ID_AA64DFR0_EL1 instead of their non-AA64 variant

Updates since v1:
- Shutdowns and reboots
- MPIDR_EL1 register sync
- Fixing GICD_TYPER_LPIS value
- IPA size clamping
- -cpu host now implemented

Mohamed Mediouni (22):
qtest: hw/arm: virt: skip ACPI test for ITS off
hw/arm: virt: add GICv2m for the case when ITS is not available
tests: data: update AArch64 ACPI tables
whpx: Move around files before introducing AArch64 support
whpx: reshuffle common code
whpx: ifdef out winhvemulation on non-x86_64
whpx: common: add WHPX_INTERCEPT_DEBUG_TRAPS define
hw, target, accel: whpx: change apic_in_platform to kernel_irqchip
whpx: interrupt controller support
whpx: add arm64 support
whpx: copy over memory management logic from hvf
target/arm: cpu: mark WHPX as supporting PSCI 1.3
hw/arm: virt: cleanly fail on attempt to use the platform vGIC
together with ITS
docs: arm: update virt machine model description
whpx: arm64: clamp down IPA size
hw/arm, accel/hvf, whpx: unify get_physical_address_range between WHPX
and HVF
whpx: arm64: implement -cpu host
target/arm: whpx: instantiate GIC early
whpx: arm64: gicv3: add migration blocker
whpx: enable arm64 builds
MAINTAINERS: update maintainers for WHPX
whpx: apic: use non-deprecated APIs to control interrupt controller
state

Philippe Mathieu-Daudé (1):
accel/system: Introduce hwaccel_enabled() helper

Sebastian Ott (1):
target/arm/kvm: add constants for new PSCI versions

MAINTAINERS | 11 +-
accel/hvf/hvf-all.c | 7 +-
accel/meson.build | 1 +
accel/whpx/meson.build | 7 +
{target/i386 => accel}/whpx/whpx-accel-ops.c | 6 +-
accel/whpx/whpx-common.c | 666 +++++++++++
docs/system/arm/virt.rst | 10 +-
hw/arm/virt-acpi-build.c | 16 +-
hw/arm/virt.c | 74 +-
hw/i386/x86-cpu.c | 4 +-
hw/intc/arm_gicv3_common.c | 3 +
hw/intc/arm_gicv3_whpx.c | 249 ++++
hw/intc/meson.build | 1 +
include/hw/arm/virt.h | 6 +-
include/hw/boards.h | 3 +-
include/hw/intc/arm_gicv3_common.h | 3 +
include/system/hvf_int.h | 2 +
include/system/hw_accel.h | 13 +
.../whpx => include/system}/whpx-accel-ops.h | 4 +-
include/system/whpx-all.h | 20 +
include/system/whpx-common.h | 26 +
.../whpx => include/system}/whpx-internal.h | 23 +-
include/system/whpx.h | 4 +-
meson.build | 20 +-
target/arm/cpu.c | 3 +
target/arm/cpu64.c | 19 +-
target/arm/hvf-stub.c | 20 -
target/arm/hvf/hvf.c | 6 +-
target/arm/hvf_arm.h | 3 -
target/arm/kvm-consts.h | 2 +
target/arm/meson.build | 1 +
target/arm/whpx/meson.build | 5 +
target/arm/whpx/whpx-all.c | 1021 +++++++++++++++++
target/arm/whpx/whpx-stub.c | 15 +
target/arm/whpx_arm.h | 17 +
target/i386/cpu-apic.c | 2 +-
target/i386/hvf/hvf.c | 11 +
target/i386/whpx/meson.build | 1 -
target/i386/whpx/whpx-all.c | 569 +--------
target/i386/whpx/whpx-apic.c | 48 +-
tests/data/acpi/aarch64/virt/APIC.its_off | Bin 164 -> 188 bytes
41 files changed, 2270 insertions(+), 652 deletions(-)
create mode 100644 accel/whpx/meson.build
rename {target/i386 => accel}/whpx/whpx-accel-ops.c (96%)
create mode 100644 accel/whpx/whpx-common.c
create mode 100644 hw/intc/arm_gicv3_whpx.c
rename {target/i386/whpx => include/system}/whpx-accel-ops.h (92%)
create mode 100644 include/system/whpx-all.h
create mode 100644 include/system/whpx-common.h
rename {target/i386/whpx => include/system}/whpx-internal.h (89%)
delete mode 100644 target/arm/hvf-stub.c
create mode 100644 target/arm/whpx/meson.build
create mode 100644 target/arm/whpx/whpx-all.c
create mode 100644 target/arm/whpx/whpx-stub.c
create mode 100644 target/arm/whpx_arm.h

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