[PATCH v5 0/4] Target CPU=Host implementation for KVM ARM/ARM64

[anup.patel@linaro.org (Anup Patel)]

It will be very useful for user space (QEMU/KVMTOOL) if it has a
method of querying VCPU target type matching to underlying Host.
We can use such querying mechanism and implement machine models
in user space where VCPU target type is always same-as/similar-to
underlying Host (i.e. Target CPU=Host).

This patch series implements KVM_ARM_PREFERRED_TARGET vm ioclt for
querying VCPU target type matching underlying host. Using this new
ioctl we can implement VCPU target CPU=Host in user space.

Also, it is not mandatory to call KVM_ARM_PREFERRED_TARGET vm ioctl
and the old method of trying all possible target types using the
KVM_ARM_VCPU_INIT ioctl to initialize VCPU works fine.

V5:
 - Update documentation based on review comments

V4:
 - Fixed files exchanged between patches
 - For now return zeroed features in struct kvm_vcpu_init instance

V3:
 - Return -ENODEV if no preferred target available for host
 - Make KVM_ARM_PREFERRED_TARGET ioctl as vm ioctl

V2:
 - Renamed the ioclt to KVM_ARM_PREFERRED_TARGET
 - Return struct kvm_vcpu_init instace instead of just target type

V1:
 - Initial patch-set with ioctl named as KVM_ARM_SUITABLE_TARGET

Anup Patel (4):
  ARM: KVM: Implement kvm_vcpu_preferred_target() function
  ARM64: KVM: Implement kvm_vcpu_preferred_target() function
  ARM/ARM64: KVM: Implement KVM_ARM_PREFERRED_TARGET ioctl
  KVM: Add documentation for KVM_ARM_PREFERRED_TARGET ioctl

 Documentation/virtual/kvm/api.txt |   31 +++++++++++++++++++++++++++----
 arch/arm/include/asm/kvm_host.h   |    1 +
 arch/arm/kvm/arm.c                |   13 +++++++++++++
 arch/arm/kvm/guest.c              |   20 ++++++++++++++++++++
 arch/arm64/include/asm/kvm_host.h |    1 +
 arch/arm64/kvm/guest.c            |   20 ++++++++++++++++++++
 include/uapi/linux/kvm.h          |    1 +
 7 files changed, 83 insertions(+), 4 deletions(-)

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1.7.9.5