Changes since RFCv1:
- Took a slightly differenet approach, instead of adding all missing
Hyper-V feature leaves to feature_word_info[] remove the existing ones
from there. The logic for handling them is very different and some of
these leaves are not actually 'feature leaves'. See "i386: drop
FEAT_HYPERV feature leaves" for details.
- x86_cpu_hyperv_realize introduced [Eduardo].
- Rebased to the latest master.
This pairs with
https://lore.kernel.org/kvm/20200929150944.1235688-1-vkuznets@redhat.com/T/#t
and as KVM part is not yet fully accepted, sending this as RFC.
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).
Vitaly Kuznetsov (19):
WIP: update linux/headers
i386: fill in FEAT_HYPERV_EDX from edx instead of eax
i386: drop x86_cpu_get_supported_feature_word() forward declaration
i386: move hyperv_vendor_id initialization to x86_cpu_realizefn()
i386: move hyperv_interface_id initialization to x86_cpu_realizefn()
i386: move hyperv_version_id initialization to x86_cpu_realizefn()
i386: move hyperv_limits initialization to x86_cpu_realizefn()
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: introduce hv_cpuid_cache
i386: drop FEAT_HYPERV feature leaves
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
linux-headers/asm-x86/kvm.h | 20 ++
linux-headers/linux/kvm.h | 27 +-
target/i386/cpu.c | 135 +++------
target/i386/cpu.h | 12 +-
target/i386/kvm-stub.c | 5 +
target/i386/kvm.c | 526 ++++++++++++++++++++----------------
target/i386/kvm_i386.h | 1 +
7 files changed, 398 insertions(+), 328 deletions(-)
--
2.25.4