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authorMichael S. Tsirkin <mst@redhat.com>2014-11-12 14:27:41 +0200
committerMichael S. Tsirkin <mst@redhat.com>2015-01-08 13:17:54 +0200
commit62be4e3a5041e84304aa23637da623a205c53ecc (patch)
treeee7820454250aba1990d3a07d5ffe8afd4671752 /include/exec/cpu-all.h
parent9b8424d5735278ca382f11adc7c63072b632ab83 (diff)
downloadqemu-62be4e3a5041e84304aa23637da623a205c53ecc.tar.gz
exec: qemu_ram_alloc_resizeable, qemu_ram_resize
Add API to allocate "resizeable" RAM. This looks just like regular RAM generally, but has a special property that only a portion of it (used_length) is actually used, and migrated. This used_length size can change across reboots. Follow up patches will change used_length for such blocks at migration, making it easier to extend devices using such RAM (notably ACPI, but in the future thinkably other ROMs) without breaking migration compatibility or wasting ROM (guest) memory. Device is notified on resize, so it can adjust if necessary. qemu_ram_alloc_resizeable allocates this memory, qemu_ram_resize resizes it. Note: nothing prevents making all RAM resizeable in this way. However, reviewers felt that only enabling this selectively will make some class of errors easier to detect. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/exec/cpu-all.h')
-rw-r--r--include/exec/cpu-all.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 6f2130eab2..7ced147fd7 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -299,12 +299,15 @@ CPUArchState *cpu_copy(CPUArchState *env);
/* memory API */
-typedef struct RAMBlock {
+typedef struct RAMBlock RAMBlock;
+
+struct RAMBlock {
struct MemoryRegion *mr;
uint8_t *host;
ram_addr_t offset;
ram_addr_t used_length;
ram_addr_t max_length;
+ void (*resized)(const char*, uint64_t length, void *host);
uint32_t flags;
char idstr[256];
/* Reads can take either the iothread or the ramlist lock.
@@ -312,11 +315,11 @@ typedef struct RAMBlock {
*/
QTAILQ_ENTRY(RAMBlock) next;
int fd;
-} RAMBlock;
+};
static inline void *ramblock_ptr(RAMBlock *block, ram_addr_t offset)
{
- assert(offset < block->length);
+ assert(offset < block->used_length);
assert(block->host);
return (char *)block->host + offset;
}