KVM: introduce kvm_for_each_memslot macro
Introduce kvm_for_each_memslot to walk all valid memslot
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 43f4c92..42ad1f9 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1366,14 +1366,12 @@
{
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
- int i, j;
+ int j;
unsigned long base_gfn;
slots = kvm_memslots(kvm);
- for (i = 0; i < slots->nmemslots; i++) {
- memslot = &slots->memslots[i];
+ kvm_for_each_memslot(memslot, slots) {
base_gfn = memslot->base_gfn;
-
for (j = 0; j < memslot->npages; j++) {
if (memslot->rmap[j])
put_page((struct page *)memslot->rmap[j]);
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 715dcb4..d737443 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1128,15 +1128,15 @@
int (*handler)(struct kvm *kvm, unsigned long *rmapp,
unsigned long data))
{
- int i, j;
+ int j;
int ret;
int retval = 0;
struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
slots = kvm_memslots(kvm);
- for (i = 0; i < slots->nmemslots; i++) {
- struct kvm_memory_slot *memslot = &slots->memslots[i];
+ kvm_for_each_memslot(memslot, slots) {
unsigned long start = memslot->userspace_addr;
unsigned long end;
@@ -3985,15 +3985,15 @@
*/
unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm)
{
- int i;
unsigned int nr_mmu_pages;
unsigned int nr_pages = 0;
struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
slots = kvm_memslots(kvm);
- for (i = 0; i < slots->nmemslots; i++)
- nr_pages += slots->memslots[i].npages;
+ kvm_for_each_memslot(memslot, slots)
+ nr_pages += memslot->npages;
nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000;
nr_mmu_pages = max(nr_mmu_pages,
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 23f795c..392af47 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -308,6 +308,10 @@
(vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
idx++)
+#define kvm_for_each_memslot(memslot, slots) \
+ for (memslot = &slots->memslots[0]; \
+ memslot < slots->memslots + (slots)->nmemslots; memslot++)
+
int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index a195c07..4e5f7b7 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -134,14 +134,15 @@
static int kvm_iommu_map_memslots(struct kvm *kvm)
{
- int i, idx, r = 0;
+ int idx, r = 0;
struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
idx = srcu_read_lock(&kvm->srcu);
slots = kvm_memslots(kvm);
- for (i = 0; i < slots->nmemslots; i++) {
- r = kvm_iommu_map_pages(kvm, &slots->memslots[i]);
+ kvm_for_each_memslot(memslot, slots) {
+ r = kvm_iommu_map_pages(kvm, memslot);
if (r)
break;
}
@@ -311,16 +312,16 @@
static int kvm_iommu_unmap_memslots(struct kvm *kvm)
{
- int i, idx;
+ int idx;
struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
idx = srcu_read_lock(&kvm->srcu);
slots = kvm_memslots(kvm);
- for (i = 0; i < slots->nmemslots; i++) {
- kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn,
- slots->memslots[i].npages);
- }
+ kvm_for_each_memslot(memslot, slots)
+ kvm_iommu_put_pages(kvm, memslot->base_gfn, memslot->npages);
+
srcu_read_unlock(&kvm->srcu, idx);
return 0;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b5ed777..4c2900c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -547,11 +547,11 @@
void kvm_free_physmem(struct kvm *kvm)
{
- int i;
struct kvm_memslots *slots = kvm->memslots;
+ struct kvm_memory_slot *memslot;
- for (i = 0; i < slots->nmemslots; ++i)
- kvm_free_physmem_slot(&slots->memslots[i], NULL);
+ kvm_for_each_memslot(memslot, slots)
+ kvm_free_physmem_slot(memslot, NULL);
kfree(kvm->memslots);
}
@@ -975,15 +975,13 @@
static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
gfn_t gfn)
{
- int i;
+ struct kvm_memory_slot *memslot;
- for (i = 0; i < slots->nmemslots; ++i) {
- struct kvm_memory_slot *memslot = &slots->memslots[i];
-
+ kvm_for_each_memslot(memslot, slots)
if (gfn >= memslot->base_gfn
&& gfn < memslot->base_gfn + memslot->npages)
return memslot;
- }
+
return NULL;
}