[Qemu-devel] [PATCH 1/6] remove smaller slots if registering a bigger one

[Glauber Costa <glommer@redhat.com>]

It's like a shark eating a bunch of small fishes:
in some situations (vga linear frame buffer mapping,
for example), we need to register a new slot in place
of older, smaller ones. This patch handles this case

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 kvm-all.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index 11034df..3c12c37 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -582,6 +582,16 @@ void kvm_set_phys_mem(target_phys_addr_t start_addr,
                 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
 
             return;
+        } else if (start_addr <= mem->start_addr &&
+                   (start_addr + size) >= (mem->start_addr +
+                                           mem->memory_size)) {
+            KVMSlot slot;
+            /* unregister whole slot */
+            memcpy(&slot, mem, sizeof(slot));
+            mem->memory_size = 0;
+            kvm_set_user_memory_region(s, mem);
+
+            kvm_set_phys_mem(start_addr, size, phys_offset);
         } else {
             printf("Registering overlapping slot\n");
             abort();
-- 
1.5.6.5