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KVM/Hyper-V: Add new KVM capability KVM_CAP_HYPERV_DIRECT_TLBFLUSH

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Hyper-V direct tlb flush function should be enabled for
guest that only uses Hyper-V hypercall. User space
hypervisor(e.g, Qemu) can disable KVM identification in
CPUID and just exposes Hyper-V identification to make
sure the precondition. Add new KVM capability KVM_CAP_
HYPERV_DIRECT_TLBFLUSH for user space to enable Hyper-V
direct tlb function and this function is default to be
disabled in KVM.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Tianyu Lan
2019-08-22 22:30:20 +08:00
committed by Paolo Bonzini
parent 7a83247e01
commit 344c6c8047
4 changed files with 23 additions and 0 deletions
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8
arch/x86/kvm/x86.c
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@@ -3282,6 +3282,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = kvm_x86_ops->get_nested_state ?
kvm_x86_ops->get_nested_state(NULL, NULL, 0) : 0;
break;
case KVM_CAP_HYPERV_DIRECT_TLBFLUSH:
r = kvm_x86_ops->enable_direct_tlbflush ? 1 : 0;
break;
default:
break;
}
@@ -4055,6 +4058,11 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
r = -EFAULT;
}
return r;
case KVM_CAP_HYPERV_DIRECT_TLBFLUSH:
if (!kvm_x86_ops->enable_direct_tlbflush)
return -ENOTTY;
return kvm_x86_ops->enable_direct_tlbflush(vcpu);
default:
return -EINVAL;