[PATCH RFC 18/22] KVM: x86: hyper-v: Honor HV_SIGNAL_EVENTS privilege bit
From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: 2021-04-13 12:29:44
Also in:
kvm, lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), kvm x86 hyper-v (kvm/hyper-v), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Vitaly Kuznetsov, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Hyper-V partition must possess 'HV_SIGNAL_EVENTS' privilege to issue HVCALL_SIGNAL_EVENT hypercalls. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> --- arch/x86/kvm/hyperv.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 6e4bf1da9dcf..b661f92d90c8 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c@@ -2120,6 +2120,12 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu) kvm_vcpu_on_spin(vcpu, true); break; case HVCALL_SIGNAL_EVENT: + if (unlikely(!(hv_vcpu->cpuid_cache.features_ebx & + HV_SIGNAL_EVENTS))) { + ret = HV_STATUS_ACCESS_DENIED; + break; + } + if (unlikely(rep)) { ret = HV_STATUS_INVALID_HYPERCALL_INPUT; break;
--
2.30.2