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Subject[PATCH 1/3] KVM: introduce memslots_updated function
Introduce memslots_updated function which is called after memslots updated

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
arch/x86/kvm/x86.c | 2 +-
include/linux/kvm_host.h | 1 +
virt/kvm/kvm_main.c | 15 +++++++++------
3 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 17af71d..888f0b0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3252,7 +3252,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
goto out;
memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
slots->memslots[log->slot].dirty_bitmap = dirty_bitmap;
- slots->generation++;
+ memslots_updated(slots, log->slot);

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 865486f..15ff818 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -331,6 +331,7 @@ int is_error_pfn(pfn_t pfn);
int is_hwpoison_pfn(pfn_t pfn);
int is_fault_pfn(pfn_t pfn);
int kvm_is_error_hva(unsigned long addr);
+void memslots_updated(struct kvm_memslots *slots, int slot_id);
int kvm_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
int user_alloc);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e3e744c..e1c6e24 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -623,6 +623,13 @@ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
}
#endif /* !CONFIG_S390 */

+void memslots_updated(struct kvm_memslots *slots, int slot_id)
+{
+ if (slot_id >= slots->nmemslots)
+ slots->nmemslots = slot_id + 1;
+ slots->generation++;
+}
+
/*
* Allocate some memory and give it an address in the guest physical address
* space.
@@ -768,10 +775,8 @@ skip_lpage:
if (!slots)
goto out_free;
memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
- if (mem->slot >= slots->nmemslots)
- slots->nmemslots = mem->slot + 1;
- slots->generation++;
slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
+ memslots_updated(slots, mem->slot);

old_memslots = kvm->memslots;
rcu_assign_pointer(kvm->memslots, slots);
@@ -803,9 +808,6 @@ skip_lpage:
if (!slots)
goto out_free;
memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
- 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) {
@@ -816,6 +818,7 @@ skip_lpage:
}

slots->memslots[mem->slot] = new;
+ memslots_updated(slots, mem->slot);
old_memslots = kvm->memslots;
rcu_assign_pointer(kvm->memslots, slots);
synchronize_srcu_expedited(&kvm->srcu);
--
1.7.4


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