It will be very useful for user space 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 ioclt for querying VCPU target type matching underlying host. Using this new ioctl we can implement VCPU target CPU=Host in user space (i.e. QEMU/KVMTOOL).
Also, it is not mandatory to call KVM_ARM_PREFERRED_TARGET ioctl and the old method of trying all possible target types using KVM_ARM_VCPU_INIT ioctl to initialize VCPU works fine.
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 | 26 ++++++++++++++++++++++---- arch/arm/include/asm/kvm_host.h | 1 + arch/arm/kvm/arm.c | 12 ++++++++++++ arch/arm/kvm/guest.c | 19 +++++++++++++++++++ arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/guest.c | 20 ++++++++++++++++++++ include/uapi/linux/kvm.h | 1 + 7 files changed, 76 insertions(+), 4 deletions(-)