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FAILED: patch "[PATCH] KVM: x86: Forbid VMM to set SYNIC/STIMER MSRs when SynIC" failed to apply to 5.4-stable tree

PATCH [email protected] 1 participant 1 message Apr 3, 2022

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Stable branch x86 KVM x86 KVM x86 Hyper-V
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The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b1e34d325397a33d97d845e312d7cf2a8b646b44 Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <[email protected]>
Date: Fri, 25 Mar 2022 14:21:40 +0100
Subject: [PATCH] KVM: x86: Forbid VMM to set SYNIC/STIMER MSRs when SynIC
wasn't activated

Setting non-zero values to SYNIC/STIMER MSRs activates certain features, this should not happen when KVM_CAP_HYPERV_SYNIC{,2} was not activated.

Note, it would've been better to forbid writing anything to SYNIC/STIMER MSRs, including zeroes, however, at least QEMU tries clearing HV_X64_MSR_STIMER0_CONFIG without SynIC. HV_X64_MSR_EOM MSR is somewhat 'special' as writing zero there triggers an action, this also should not happen when SynIC wasn't activated.

Signed-off-by Vitaly Kuznetsov <[email protected]>

Message-Id: <[email protected]>

Cc [email protected]
Signed-off-by Paolo Bonzini <[email protected]>
arch/x86/kvm/hyperv.c +6 -3
index f715b5a2b0e4..4177c17a26bf 100644
@@ -239,7 +239,7 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
 	struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic);
 	int ret;
 
-	if (!synic->active && !host)
+	if (!synic->active && (!host || data))
 		return 1;
 
 	trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);

@@ -285,6 +285,9 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
 	case HV_X64_MSR_EOM: {
 		int i;
 
+		if (!synic->active)
+			break;
+
 		for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
 			kvm_hv_notify_acked_sint(vcpu, i);
 		break;

@@ -664,7 +667,7 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
 	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 	struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
 
-	if (!synic->active && !host)
+	if (!synic->active && (!host || config))
 		return 1;
 
 	if (unlikely(!host && hv_vcpu->enforce_cpuid && new_config.direct_mode &&

@@ -693,7 +696,7 @@ static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
 	struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
 	struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
 
-	if (!synic->active && !host)
+	if (!synic->active && (!host || count))
 		return 1;
 
 	trace_kvm_hv_stimer_set_count(hv_stimer_to_vcpu(stimer)->vcpu_id,