[Qemu-devel] [PATCH] acpi-build: dirty memory on RSDP/linker update

["Michael S. Tsirkin" <mst@redhat.com>]

This is required to make sure they are migrated
correctly.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/i386/acpi-build.c | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 1dfdf35..fd6ef78 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1271,6 +1271,8 @@ struct AcpiBuildState {
     uint8_t patched;
     PcGuestInfo *guest_info;
     void *rsdp;
+    ram_addr_t rsdp_ram;
+    uint32_t rsdp_size;
     ram_addr_t linker_ram;
     uint32_t linker_size;
 } AcpiBuildState;
@@ -1478,13 +1480,22 @@ static void acpi_build_update(void *build_opaque, uint32_t offset)
 
     memcpy(qemu_get_ram_ptr(build_state->table_ram), tables.table_data->data,
            build_state->table_size);
-    memcpy(build_state->rsdp, tables.rsdp->data, acpi_data_len(tables.rsdp));
-    memcpy(qemu_get_ram_ptr(build_state->linker_ram), tables.linker->data,
-           build_state->linker_size);
-
     cpu_physical_memory_set_dirty_range_nocode(build_state->table_ram,
                                                build_state->table_size);
 
+    if (build_state->rsdp) {
+        memcpy(build_state->rsdp, tables.rsdp->data, acpi_data_len(tables.rsdp));
+    } else {
+        memcpy(qemu_get_ram_ptr(build_state->rsdp_ram), tables.linker->data,
+               build_state->rsdp_size);
+        cpu_physical_memory_set_dirty_range_nocode(build_state->rsdp_ram,
+                                                   build_state->rsdp_size);
+    }
+    memcpy(qemu_get_ram_ptr(build_state->linker_ram), tables.linker->data,
+           build_state->linker_size);
+    cpu_physical_memory_set_dirty_range_nocode(build_state->linker_ram,
+                                               build_state->linker_size);
+
     acpi_build_tables_cleanup(&tables, true);
 }
 
@@ -1564,10 +1575,13 @@ void acpi_setup(PcGuestInfo *guest_info)
                                  acpi_build_update, build_state,
                                  tables.rsdp->data, acpi_data_len(tables.rsdp));
         build_state->rsdp = tables.rsdp->data;
+        build_state->rsdp_ram = (ram_addr_t)-1;
+        build_state->rsdp_size = 0;
     } else {
-        build_state->rsdp = qemu_get_ram_ptr(
-            acpi_add_rom_blob(build_state, tables.rsdp, ACPI_BUILD_RSDP_FILE, 0)
-        );
+        build_state->rsdp = NULL;
+        build_state->rsdp_ram = acpi_add_rom_blob(build_state, tables.rsdp,
+                                                  ACPI_BUILD_RSDP_FILE, 0);
+        build_state->rsdp_size = acpi_data_len(tables.rsdp);
     }
 
     qemu_register_reset(acpi_build_reset, build_state);
-- 
MST