FAILED: patch "[PATCH] KVM: x86: Check lapic_in_kernel() before attempting to set a" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-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 7ec37d1cbe17d8189d9562178d8b29167fe1c31a Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <[email protected]>
Date: Fri, 25 Mar 2022 14:21:38 +0100
Subject: [PATCH] KVM: x86: Check lapic_in_kernel() before attempting to set a
SynIC irq

When KVM_CAP_HYPERV_SYNIC{,2} is activated, KVM already checks for irqchip_in_kernel() so normally SynIC irqs should never be set. It is, however, possible for a misbehaving VMM to write to SYNIC/STIMER MSRs causing erroneous behavior.

The immediate issue being fixed is that kvm_irq_delivery_to_apic() (kvm_irq_delivery_to_apic_fast()) crashes when called with 'irq.shorthand = APIC_DEST_SELF' and 'src == NULL'.

Message-Id: <[email protected]>

index a32f54ab84a2..f715b5a2b0e4 100644
@@ -449,6 +449,9 @@ static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
 	struct kvm_lapic_irq irq;
 	int ret, vector;
 
+	if (KVM_BUG_ON(!lapic_in_kernel(vcpu), vcpu->kvm))
+		return -EINVAL;
+
 	if (sint >= ARRAY_SIZE(synic->sint))
 		return -EINVAL;