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-rw-r--r--kvm-all.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/kvm-all.c b/kvm-all.c
index 711975195..77eadf608 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -542,17 +542,26 @@ static void kvm_set_phys_mem(MemoryRegionSection *section, bool add)
target_phys_addr_t start_addr = section->offset_within_address_space;
ram_addr_t size = section->size;
void *ram = NULL;
+ unsigned delta;
/* kvm works in page size chunks, but the function may be called
with sub-page size and unaligned start address. */
- size = TARGET_PAGE_ALIGN(size);
- start_addr = TARGET_PAGE_ALIGN(start_addr);
+ delta = TARGET_PAGE_ALIGN(size) - size;
+ if (delta > size) {
+ return;
+ }
+ start_addr += delta;
+ size -= delta;
+ size &= TARGET_PAGE_MASK;
+ if (!size || (start_addr & ~TARGET_PAGE_MASK)) {
+ return;
+ }
if (!memory_region_is_ram(mr)) {
return;
}
- ram = memory_region_get_ram_ptr(mr) + section->offset_within_region;
+ ram = memory_region_get_ram_ptr(mr) + section->offset_within_region + delta;
while (1) {
mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);