[Qemu-devel] [PATCH v4 2/3] pc: acpi-build: update linker on guest access

[Igor Mammedov <imammedo@redhat.com>]

Linker table is build only once, so if later during
tables rebuild sizes of other ACPI tables change
pointers will be patched incorrectly due to wrong
offsets in linker. Resulting in guest not being able
to find ACPI tables.
Fix it by updating 'linker' table with the rest of
tables when firmware reads it.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/i386/acpi-build.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 5b2b017..21ea3db 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1527,6 +1527,8 @@ struct AcpiBuildState {
     uint8_t patched;
     PcGuestInfo *guest_info;
     void *rsdp;
+    ram_addr_t linker_ram;
+    uint32_t linker_size;
 } AcpiBuildState;
 
 static bool acpi_get_mcfg(AcpiMcfgInfo *mcfg)
@@ -1733,6 +1735,8 @@ 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);
@@ -1799,7 +1803,9 @@ void acpi_setup(PcGuestInfo *guest_info)
     assert(build_state->table_ram != RAM_ADDR_MAX);
     build_state->table_size = acpi_data_len(tables.table_data);
 
-    acpi_add_rom_blob(NULL, tables.linker, "etc/table-loader", 0);
+    build_state->linker_ram =
+        acpi_add_rom_blob(build_state, tables.linker, "etc/table-loader", 0);
+    build_state->linker_size = acpi_data_len(tables.linker);
 
     fw_cfg_add_file(guest_info->fw_cfg, ACPI_BUILD_TPMLOG_FILE,
                     tables.tcpalog->data, acpi_data_len(tables.tcpalog));
-- 
1.8.3.1