[PATCH 5/9] substitute is_allocated_mem with more general is_containing_region

Glauber Costa
2008-08-13T00:57:59Z

libkvm/libkvm.c | 34 +++++++++++++++++++++-------------
libkvm/libkvm.h | 2 +-
qemu/qemu-kvm.c | 2 +-
3 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c
index 33f00b7..c885dee 100644
--- a/libkvm/libkvm.c
+++ b/libkvm/libkvm.c
@@ -140,6 +140,27 @@ int get_intersecting_slot(unsigned long phys_addr)
return -1;
}

+/* Returns -1 if this slot is not totally contained on any other,
+ * and the number of the slot otherwise */
+int get_container_slot(uint64_t phys_addr, unsigned long size)
+{
+ int i;
+
+ for (i = 0; i < KVM_MAX_NUM_MEM_REGIONS ; ++i)
+ if (slots[i].len && slots[i].phys_addr <= phys_addr &&
+ (slots[i].phys_addr + slots[i].len) >= phys_addr + size)
+ return i;
+ return -1;
+}
+
+int kvm_is_containing_region(kvm_context_t kvm, unsigned long phys_addr, unsigned long size)
+{
+ int slot = get_container_slot(phys_addr, size);
+ if (slot == -1)
+ return 0;
+ return 1;
+}
+
/*
* dirty pages logging control
*/
@@ -491,19 +512,6 @@ int kvm_is_intersecting_mem(kvm_context_t kvm, unsigned long phys_start)
return get_intersecting_slot(phys_start) != -1;
}

-int kvm_is_allocated_mem(kvm_context_t kvm, unsigned long phys_start,
- unsigned long len)
-{
- int slot;
-
- slot = get_slot(phys_start);
- if (slot == -1)
- return 0;
- if (slots[slot].len == len)
- return 1;
- return 0;
-}
-
int kvm_register_userspace_phys_mem(kvm_context_t kvm,
unsigned long phys_start, void *userspace_addr,
unsigned long len, int log)
diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
index 9f06fcc..d762323 100644
--- a/libkvm/libkvm.h
+++ b/libkvm/libkvm.h
@@ -454,7 +454,7 @@ void *kvm_create_phys_mem(kvm_context_t, unsigned long phys_start,
unsigned long len, int log, int writable);
void kvm_destroy_phys_mem(kvm_context_t, unsigned long phys_start,
unsigned long len);
-int kvm_is_intersecting_mem(kvm_context_t kvm, unsigned long phys_start);
+int kvm_is_containing_region(kvm_context_t kvm, unsigned long phys_start, unsigned long size);
int kvm_is_allocated_mem(kvm_context_t kvm, unsigned long phys_start,
unsigned long len);
int kvm_create_mem_hole(kvm_context_t kvm, unsigned long phys_start,
diff --git a/qemu/qemu-kvm.c b/qemu/qemu-kvm.c
index e6221f8..bfbaacc 100644
--- a/qemu/qemu-kvm.c
+++ b/qemu/qemu-kvm.c
@@ -783,7 +783,7 @@ void kvm_cpu_register_physical_memory(target_phys_addr_t start_addr,
r = kvm_check_extension(kvm_context, KVM_CAP_USER_MEMORY);
if (r) {
phys_offset &= ~IO_MEM_ROM;
- r = kvm_is_allocated_mem(kvm_context, start_addr, size);
+ r = kvm_is_containing_region(kvm_context, start_addr, size);
if (r)
return;
r = kvm_is_intersecting_mem(kvm_context, start_addr);
--
1.5.5.1