This pairs with https://lore.kernel.org/kvm/20200807083946.377654-1-vkuznets@redhat.com/
and as KVM part is not yet 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 (22):
WIP: update linux/headers
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: fill in FEAT_HYPERV_EDX from edx instead of eax
i386: invert hyperv_spinlock_attempts setting logic with
hv_passthrough
i386: add reserved FEAT_HYPERV_ECX CPUID leaf
i386: add reserved FEAT_HV_RECOMM_ECX/FEAT_HV_RECOMM_EDX CPUID leaves
i386: add reserved FEAT_HV_NESTED_EBX/ECX/EDX CPUID leaves
i386: always fill Hyper-V CPUID feature leaves from X86CPU data
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: make hyperv_expand_features() return void
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: prepare hyperv_expand_features() to be called at CPU feature
expansion time
i386: use global kvm_state in hyperv_enabled() check
i386: record if Hyper-V features were already expanded
i386: expand Hyper-V features early
include/standard-headers/drm/drm_fourcc.h | 140 +++++++
include/standard-headers/linux/ethtool.h | 87 +++++
.../linux/input-event-codes.h | 3 +-
linux-headers/asm-generic/unistd.h | 6 +-
linux-headers/asm-mips/unistd_n32.h | 1 +
linux-headers/asm-mips/unistd_n64.h | 1 +
linux-headers/asm-mips/unistd_o32.h | 1 +
linux-headers/asm-powerpc/kvm.h | 5 +
linux-headers/asm-powerpc/mman.h | 2 +-
linux-headers/asm-powerpc/unistd_32.h | 1 +
linux-headers/asm-powerpc/unistd_64.h | 1 +
linux-headers/asm-s390/kvm.h | 7 +-
linux-headers/asm-s390/unistd_32.h | 1 +
linux-headers/asm-s390/unistd_64.h | 1 +
linux-headers/asm-x86/unistd_32.h | 1 +
linux-headers/asm-x86/unistd_64.h | 1 +
linux-headers/asm-x86/unistd_x32.h | 1 +
linux-headers/linux/kvm.h | 7 +-
linux-headers/linux/vfio.h | 2 +-
target/i386/cpu.c | 78 +++-
target/i386/cpu.h | 13 +-
target/i386/kvm.c | 347 ++++++++++++------
target/i386/kvm_i386.h | 7 +
23 files changed, 579 insertions(+), 135 deletions(-)
--
2.25.4