[PATCH v4 07/12] Maintain memslot version number

[Gleb Natapov <gleb@redhat.com>]

Code that depends on particular memslot layout can track changes and
adjust to new layout.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
 include/linux/kvm_host.h |    1 +
 virt/kvm/kvm_main.c      |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index e796326..64f62f1 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -177,6 +177,7 @@ struct kvm {
 	raw_spinlock_t requests_lock;
 	struct mutex slots_lock;
 	struct mm_struct *mm; /* userspace tied to this vm */
+	u32 memslot_version;
 	struct kvm_memslots *memslots;
 	struct srcu_struct srcu;
 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a60b6b0..733558c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -730,6 +730,7 @@ skip_lpage:
 	slots->memslots[mem->slot] = new;
 	old_memslots = kvm->memslots;
 	rcu_assign_pointer(kvm->memslots, slots);
+	kvm->memslot_version++;
 	synchronize_srcu_expedited(&kvm->srcu);
 
 	kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
-- 
1.7.1

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