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 (file)
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1366,14 +1366,12 @@ static void kvm_release_vm_pages(struct kvm *kvm)
 {
        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 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1128,15 +1128,15 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
                          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 @@ nomem:
  */
 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 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -308,6 +308,10 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
             (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 (file)
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -134,14 +134,15 @@ unmap_pages:
 
 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 void kvm_iommu_put_pages(struct kvm *kvm,
 
 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 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -547,11 +547,11 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 
 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 @@ EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
                                                gfn_t gfn)
 {
-       int i;
-
-       for (i = 0; i < slots->nmemslots; ++i) {
-               struct kvm_memory_slot *memslot = &slots->memslots[i];
+       struct kvm_memory_slot *memslot;
 
+       kvm_for_each_memslot(memslot, slots)
                if (gfn >= memslot->base_gfn
                    && gfn < memslot->base_gfn + memslot->npages)
                        return memslot;
-       }
+
        return NULL;
 }