[v3,00/19] i386: KVM: expand Hyper-V features early and provide simple 'hv-default=on' option

Message

Vitaly Kuznetsov Jan. 7, 2021, 3:06 p.m. UTC

This series is a successor of "[PATCH RFC v3 00/23] i386: KVM: expand
Hyper-V features early" and "[PATCH v2 2/2] i386: provide simple 'hyperv=on'"
option to x86 machine types".

Changes:
- Make 'hv-default' a CPU option and not a machine type option [Igor].
- Introduce a simple qtest [Eduardo].
- Update linux headers from 5.11-rc2.

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 (19):
  linux-headers: update against 5.11-rc2
  i386: introduce kvm_hv_evmcs_available()
  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: provide simple 'hv-default=on' option
  qtest/hyperv: Introduce a simple hyper-v test

 MAINTAINERS                                   |   1 +
 docs/hyperv.txt                               |  16 +-
 .../infiniband/hw/vmw_pvrdma/pvrdma_verbs.h   |   2 +-
 include/standard-headers/drm/drm_fourcc.h     | 175 +++++-
 include/standard-headers/linux/const.h        |  36 ++
 include/standard-headers/linux/ethtool.h      |   2 +-
 include/standard-headers/linux/fuse.h         |  30 +-
 include/standard-headers/linux/kernel.h       |   9 +-
 include/standard-headers/linux/pci_regs.h     |  16 +
 include/standard-headers/linux/vhost_types.h  |   9 +
 include/standard-headers/linux/virtio_gpu.h   |  82 +++
 include/standard-headers/linux/virtio_ids.h   |  44 +-
 linux-headers/asm-arm64/kvm.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/unistd_32.h         |   1 +
 linux-headers/asm-powerpc/unistd_64.h         |   1 +
 linux-headers/asm-s390/unistd_32.h            |   1 +
 linux-headers/asm-s390/unistd_64.h            |   1 +
 linux-headers/asm-x86/kvm.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                     |  56 +-
 linux-headers/linux/userfaultfd.h             |   9 +
 linux-headers/linux/vfio.h                    |   1 +
 linux-headers/linux/vhost.h                   |   4 +
 scripts/update-linux-headers.sh               |   5 +-
 target/i386/cpu.c                             | 151 ++---
 target/i386/cpu.h                             |  11 +-
 target/i386/kvm/kvm-stub.c                    |  10 +
 target/i386/kvm/kvm.c                         | 524 ++++++++++--------
 target/i386/kvm/kvm_i386.h                    |   2 +
 tests/qtest/hyperv-test.c                     | 238 ++++++++
 tests/qtest/meson.build                       |   3 +-
 37 files changed, 1074 insertions(+), 382 deletions(-)
 create mode 100644 include/standard-headers/linux/const.h
 create mode 100644 tests/qtest/hyperv-test.c