FAILED: patch "[PATCH] KVM: x86: set KVM_REQ_EVENT on local interrupt request from" failed to apply to 4.3-stable tree

FAILED: patch "[PATCH] KVM: x86: set KVM_REQ_EVENT on local interrupt request from" failed to apply to 4.3-stable tree

[gregkh]

The patch below does not apply to the 4.3-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 <stable@vger.kernel.org>.

thanks,

greg k-h

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

>From 934bf65354227981df15bbc755d33f4ba3443ff2 Mon Sep 17 00:00:00 2001
From: Matt Gingell <gingell@google.com>
Date: Mon, 16 Nov 2015 15:26:05 -0800
Subject: [PATCH] KVM: x86: set KVM_REQ_EVENT on local interrupt request from
 user space

Set KVM_REQ_EVENT when a PIC in user space injects a local interrupt.

Currently a request is only made when neither the PIC nor the APIC is in
the kernel, which is not sufficient in the split IRQ chip case.

This addresses a problem in QEMU where interrupts are delayed until
another path invokes the event loop.

Reviewed-by: Steve Rutherford <srutherford@google.com>
Signed-off-by: Matt Gingell <gingell@google.com>
Fixes: 1c1a9ce973a7863dd46767226bce2a5f12d48bc6
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 32f6b760682c..f254e296d368 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2806,6 +2806,7 @@ static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 		return -EEXIST;
 
 	vcpu->arch.pending_external_vector = irq->irq;
+	kvm_make_request(KVM_REQ_EVENT, vcpu);
 	return 0;
 }