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KVM: nVMX: add KVM_CAP_HYPERV_ENLIGHTENED_VMCS capability

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Enlightened VMCS is opt-in. The current version does not contain all
fields supported by nested VMX so we must not advertise the
corresponding VMX features if enlightened VMCS is enabled.

Userspace is given the enlightened VMCS version supported by KVM as
part of enabling KVM_CAP_HYPERV_ENLIGHTENED_VMCS. The version is to
be advertised to the nested hypervisor, currently done via a cpuid
leaf for Hyper-V.

Suggested-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2018-10-16 18:50:01 +02:00 • committed by Paolo Bonzini
parent 5d7a644336
commit 57b119da35
5 changed files with 65 additions and 0 deletions
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1
include/uapi/linux/kvm.h
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@ -963,6 +963,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_PPC_NESTED_HV 160
#define KVM_CAP_HYPERV_SEND_IPI 161
#define KVM_CAP_COALESCED_PIO 162
#define KVM_CAP_HYPERV_ENLIGHTENED_VMCS 163
#ifdef KVM_CAP_IRQ_ROUTING