linux-kernel - [PATCH 23/30] KVM: x86: hyper-v: Honor HV_SIGNAL

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Message-Id: <20210419160127.192712-24-vkuznets@redhat.com>
Date:   Mon, 19 Apr 2021 18:01:20 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 23/30] KVM: x86: hyper-v: Honor HV_SIGNAL_EVENTS privilege bit

Hyper-V partition must possess 'HV_SIGNAL_EVENTS' privilege to issue
HVCALL_SIGNAL_EVENT hypercalls.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kvm/hyperv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index ff86c00d1396..523f63287636 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2033,6 +2033,8 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
 			hv_vcpu->cpuid_cache.enlightenments_ebx != U32_MAX;
 	case HVCALL_POST_MESSAGE:
 		return hv_vcpu->cpuid_cache.features_ebx & HV_POST_MESSAGES;
+	case HVCALL_SIGNAL_EVENT:
+		return hv_vcpu->cpuid_cache.features_ebx & HV_SIGNAL_EVENTS;
 	default:
 		break;
 	}
-- 
2.30.2