[PATCH 4/6] Increment dirty counter for vmexit due to page write fault.

[Shivam Kumar <shivam.kumar1@nutanix.com>]

For a page write fault or "page dirty", the dirty counter of the
corresponding vCPU is incremented.

Co-developed-by: Anurag Madnawat <anurag.madnawat@nutanix.com>
Signed-off-by: Anurag Madnawat <anurag.madnawat@nutanix.com>
Signed-off-by: Shivam Kumar <shivam.kumar1@nutanix.com>
Signed-off-by: Shaju Abraham <shaju.abraham@nutanix.com>
Signed-off-by: Manish Mishra <manish.mishra@nutanix.com>
---
 virt/kvm/kvm_main.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 95f857c50bf2..c41b85af8682 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3083,8 +3083,15 @@ void mark_page_dirty_in_slot(struct kvm *kvm,
 		if (kvm->dirty_ring_size)
 			kvm_dirty_ring_push(kvm_dirty_ring_get(kvm),
 					    slot, rel_gfn);
-		else
+		else {
+			struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
+
+			if (vcpu && vcpu->kvm->dirty_quota_migration_enabled &&
+					vcpu->vCPUdqctx)
+				vcpu->vCPUdqctx->dirty_counter++;
+
 			set_bit_le(rel_gfn, memslot->dirty_bitmap);
+		}
 	}
 }
 EXPORT_SYMBOL_GPL(mark_page_dirty_in_slot);
-- 
2.22.3