linux-kernel - [PATCH 22/30] KVM: x86: hyper-v: Honor HV_POST

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Message-Id: <20210419160127.192712-23-vkuznets@redhat.com>
Date:   Mon, 19 Apr 2021 18:01:19 +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 22/30] KVM: x86: hyper-v: Honor HV_POST_MESSAGES privilege bit

Hyper-V partition must possess 'HV_POST_MESSAGES' privilege to issue
HVCALL_POST_MESSAGE 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 bd424f2d4294..ff86c00d1396 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2031,6 +2031,8 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
 	case HVCALL_NOTIFY_LONG_SPIN_WAIT:
 		return hv_vcpu->cpuid_cache.enlightenments_ebx &&
 			hv_vcpu->cpuid_cache.enlightenments_ebx != U32_MAX;
+	case HVCALL_POST_MESSAGE:
+		return hv_vcpu->cpuid_cache.features_ebx & HV_POST_MESSAGES;
 	default:
 		break;
 	}
-- 
2.30.2