[PATCH v3 07/12] Maintain memslot version number

[Gleb Natapov]

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

Signed-off-by: Gleb Natapov <g...@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 600baf0..3f5ebc2 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -163,6 +163,7 @@ struct kvm {
        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 a5077df..df3325c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -737,6 +737,7 @@ 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);
-- 
1.6.5

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