From: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Introduce update_memslots to update slot which will be update to
kvm->memslots
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/x86.c | 2 +-
include/linux/kvm_host.h | 1 +
virt/kvm/kvm_main.c | 22 +++++++++++++++-------
3 files changed, 17 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1985ea1..a9e5a59 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3547,7 +3547,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
memslot = &slots->memslots[log->slot];
memslot->dirty_bitmap = dirty_bitmap;
memslot->nr_dirty_pages = 0;
- slots->generation++;
+ update_memslots(slots, NULL);
old_slots = kvm->memslots;
rcu_assign_pointer(kvm->memslots, slots);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 924df0d..23f795c 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -320,6 +320,7 @@ void kvm_exit(void);
void kvm_get_kvm(struct kvm *kvm);
void kvm_put_kvm(struct kvm *kvm);
+void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new);
static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
{
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9ad94c9..b5ed777 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -630,6 +630,19 @@ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
}
#endif /* !CONFIG_S390 */
+void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
+{
+ if (new) {
+ int id = new->id;
+
+ slots->memslots[id] = *new;
+ if (id >= slots->nmemslots)
+ slots->nmemslots = id + 1;
+ }
+
+ slots->generation++;
+}
+
/*
* Allocate some memory and give it an address in the guest physical address
* space.
@@ -780,10 +793,8 @@ skip_lpage:
GFP_KERNEL);
if (!slots)
goto out_free;
- if (mem->slot >= slots->nmemslots)
- slots->nmemslots = mem->slot + 1;
- slots->generation++;
slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
+ update_memslots(slots, NULL);
old_memslots = kvm->memslots;
rcu_assign_pointer(kvm->memslots, slots);
@@ -815,9 +826,6 @@ skip_lpage:
GFP_KERNEL);
if (!slots)
goto out_free;
- if (mem->slot >= slots->nmemslots)
- slots->nmemslots = mem->slot + 1;
- slots->generation++;
/* actual memory is freed via old in kvm_free_physmem_slot below */
if (!npages) {
@@ -827,7 +835,7 @@ skip_lpage:
new.lpage_info[i] = NULL;
}
- slots->memslots[mem->slot] = new;
+ update_memslots(slots, &new);
old_memslots = kvm->memslots;
rcu_assign_pointer(kvm->memslots, slots);
synchronize_srcu_expedited(&kvm->srcu);
--
1.7.7.3
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