This series adds ARM Nested Virtualization support in KVM mode. This is a respin of previous contributions from Miguel [1] and Haibo [2].
This was tested with Marc's v11 [3] on Ampere HW with fedora L1 guest and L2 guests booted without EDK2. However it does not work yet with EDK2 but it looks unrelated to this qemu integration (host hard lockups). The host needs to be booted with "kvm-arm.mode=nested" option and qemu needs to be invoked with : -machine virt,virtualization=on There is a known issue with hosts supporting SVE. Kernel does not support both SVE and NV2 and the current qemu integration has an issue with the scratch_host_vcpu startup because both are enabled if exposed by the kernel. This is independent on whether sve is disabled on the command line. Unfortunately I lost access to the HW that expose that issue so I couldn't fix it in this version. This series can be found at: https://github.com/eauger/qemu/tree/v8.2-nv-rfcv2 Previous version from Miguel: [1] https://lore.kernel.org/all/20230227163718.62003-1-miguel.l...@oracle.com/ Previous version from Haibo: [2] https://lore.kernel.org/qemu-devel/cover.1617281290.git.haibo...@linaro.org/ [3] Marc's kernel v11 series: [PATCH v11 00/43] KVM: arm64: Nested Virtualization support (FEAT_NV2 only) https://lore.kernel.org/linux-arm-kernel/20231120131027.854038-1-...@kernel.org/T/ available at: https://github.com/eauger/linux/tree/nv-6.8-nv2-v11 Haibo Xu (5): [Placeholder] headers: Partial headers update for NV2 enablement hw/arm: Allow setting KVM vGIC maintenance IRQ target/arm/kvm: Add helper to detect EL2 when using KVM target/arm: Enable feature ARM_FEATURE_EL2 if EL2 is supported hw/arm/virt: Allow virt extensions with KVM hw/arm/virt.c | 6 +++++- hw/intc/arm_gicv3_common.c | 1 + hw/intc/arm_gicv3_kvm.c | 21 +++++++++++++++++++++ include/hw/intc/arm_gicv3_common.h | 1 + linux-headers/asm-arm64/kvm.h | 1 + linux-headers/linux/kvm.h | 1 + target/arm/kvm.c | 21 +++++++++++++++++++++ target/arm/kvm_arm.h | 12 ++++++++++++ 8 files changed, 63 insertions(+), 1 deletion(-) -- 2.41.0
