On 07/19/2010 06:30 PM, Gleb Natapov wrote:
Code that depends on particular memslot layout can track changes and
adjust to new layout.
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c13cc48..c74ffc0 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 b78b794..292514c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -733,6 +733,7 @@ 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);
How does this interact with rcu? Nothing enforces consistency between
rcu_dereference(kvm->memslots) and kvm->memslot_version.
Should probably be rcu_dereference(kvm->memslots)->version.
--
error compiling committee.c: too many arguments to function
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