Changes since v3:
- Make 'hv-default' override 'hv-*' options which were already set
(e.g. 'hv-feature=on,hv-default' case) [Igor]. Make 'hv-passthrough'
behave the same way.
- Add "i386: be more picky about implicit 'hv-evmcs' enablement" patch to avoid
enabling 'hv-evmcs' with hv-default/hv-passthrough when guest CPU lacks VMX.
- Add "i386: support 'hv-passthrough,hv-feature=off' on the command line" patch
to make 'hv-passthrough' semantics match the newly introduced 'hv-default'.
- Add "i386: track explicit 'hv-*' features enablement/disablement" patch to
support the above mentioned changes.
- Expand qtest to check the above mentioned improvements.
Original description:
Upper layer tools like libvirt want to figure out which Hyper-V features are
supported by the underlying stack (QEMU/KVM) but currently they are unable to
do so. We have a nice 'hv_passthrough' CPU flag supported by QEMU but it has
no effect on e.g. QMP's
query-cpu-model-expansion type=full
model={"name":"host","props":{"hv-passthrough":true}}
command as we parse Hyper-V features after creating KVM vCPUs and not at
feature expansion time. To support the use-case we first need to make
KVM_GET_SUPPORTED_HV_CPUID ioctl a system-wide ioctl as the existing
vCPU version can't be used that early. This is what KVM part does. With
that done, we can make early Hyper-V feature expansion (this series).
In addition, provide a simple 'hv-default' option which enables (and
requires from KVM) all currently supported Hyper-V enlightenments.
Unlike 'hv-passthrough' mode, this is going to be migratable.
Vitaly Kuznetsov (21):
i386: keep hyperv_vendor string up-to-date
i386: invert hyperv_spinlock_attempts setting logic with
hv_passthrough
i386: always fill Hyper-V CPUID feature leaves from X86CPU data
i386: stop using env->features[] for filling Hyper-V CPUIDs
i386: introduce hyperv_feature_supported()
i386: introduce hv_cpuid_get_host()
i386: drop FEAT_HYPERV feature leaves
i386: introduce hv_cpuid_cache
i386: split hyperv_handle_properties() into
hyperv_expand_features()/hyperv_fill_cpuids()
i386: move eVMCS enablement to hyperv_init_vcpu()
i386: switch hyperv_expand_features() to using error_setg()
i386: adjust the expected KVM_GET_SUPPORTED_HV_CPUID array size
i386: prefer system KVM_GET_SUPPORTED_HV_CPUID ioctl over vCPU's one
i386: use global kvm_state in hyperv_enabled() check
i386: expand Hyper-V features during CPU feature expansion time
i386: track explicit 'hv-*' features enablement/disablement
i386: support 'hv-passthrough,hv-feature=off' on the command line
i386: be more picky about implicit 'hv-evmcs' enablement
i386: introduce kvm_hv_evmcs_available()
i386: provide simple 'hv-default=on' option
qtest/hyperv: Introduce a simple hyper-v test
MAINTAINERS | 1 +
docs/hyperv.txt | 16 +-
target/i386/cpu.c | 430 ++++++++++++++++++++---------
target/i386/cpu.h | 11 +-
target/i386/kvm/kvm-stub.c | 10 +
target/i386/kvm/kvm.c | 535 +++++++++++++++++++++----------------
target/i386/kvm/kvm_i386.h | 2 +
tests/qtest/hyperv-test.c | 312 +++++++++++++++++++++
tests/qtest/meson.build | 3 +-
9 files changed, 950 insertions(+), 370 deletions(-)
create mode 100644 tests/qtest/hyperv-test.c
--
2.29.2
