On 25/07/2018 18:30, Vitaly Kuznetsov wrote:
> Changes since v2:
> - Rebase to the current kvm/queue.
> - Simplify clean fields check in prepare_vmcs02{,_full} and
> copy_enlightened_to_vmcs12() by resetting the clean fields mask in
> nested_vmx_handle_enlightened_vmptrld() when we switch from one L2 guest
> to another [Paolo Bonzini]
> - Cope with the newly introduced vmx_get_nested_state() by returning
> -ENOTSUPP when eVMCS is in use. We'll do proper nested state save/restore
> later.
Looks good, but we have to do something about live migration. Perhaps
you can write a testcase analogous to the new state_test, that tests
eVMCS in general before we have support in QEMU.
Thanks,
Paolo
> Description:
>
> This is an initial implementation of Enlightened VMCS for nested Hyper-V on
> KVM. Using it helps to spare 1500 cpu cycles for nested vmexit (tight cpuid
> loop in WS2016 with Hyper-V role on KVM: 15200 cycles -> 13700 cycles).
>
> Ladi Prosek (1):
> KVM: hyperv: define VP assist page helpers
>
> Vitaly Kuznetsov (5):
> KVM: VMX: refactor evmcs_sanitize_exec_ctrls()
> KVM: nVMX: add KVM_CAP_HYPERV_ENLIGHTENED_VMCS capability
> KVM: nVMX: add enlightened VMCS state
> KVM: nVMX: implement enlightened VMPTRLD and VMCLEAR
> KVM: nVMX: optimize prepare_vmcs02{,_full} for Enlightened VMCS case
>
> arch/x86/include/asm/kvm_host.h | 3 +
> arch/x86/kvm/hyperv.c | 23 +-
> arch/x86/kvm/hyperv.h | 4 +
> arch/x86/kvm/lapic.c | 4 +-
> arch/x86/kvm/lapic.h | 2 +-
> arch/x86/kvm/svm.c | 9 +
> arch/x86/kvm/vmx.c | 824 +++++++++++++++++++++++++++++++++-------
> arch/x86/kvm/x86.c | 17 +-
> include/uapi/linux/kvm.h | 1 +
> 9 files changed, 737 insertions(+), 150 deletions(-)
>
