[PATCH for-6.0 v2] x86: acpi: use offset instead of pointer when using build_header()

[Igor Mammedov <imammedo@redhat.com>]

Do the same as in commit
 (4d027afeb3a97 Virt: ACPI: fix qemu assert due to re-assigned table data address)
for remaining tables that happen to use saved at
the beginning pointer to build header to avoid assert
when table_data is relocated due to implicit re-size.

In this case user is trying to start Windows 10 and getting assert at
 hw/acpi/bios-linker-loader.c:239:
  bios_linker_loader_add_checksum: Assertion `start_offset < file->blob->len' failed.

Fixes: https://bugs.launchpad.net/bugs/1923497
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
v2:
  - amend commit message (Michael)
PS:
 I have build_header() refactoring patch that requires offset
 instead of pointer, to make it harder to misuse but it's
 a bit intrusive for last minute fixes. So here goes simplified
 variant, and I'll post refactoring patch for 6.1. later.

 hw/acpi/aml-build.c  | 15 +++++++++------
 hw/i386/acpi-build.c |  8 ++++++--
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index d33ce8954a..f0035d2b4a 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -1830,6 +1830,7 @@ build_rsdt(GArray *table_data, BIOSLinker *linker, GArray *table_offsets,
     int i;
     unsigned rsdt_entries_offset;
     AcpiRsdtDescriptorRev1 *rsdt;
+    int rsdt_start = table_data->len;
     const unsigned table_data_len = (sizeof(uint32_t) * table_offsets->len);
     const unsigned rsdt_entry_size = sizeof(rsdt->table_offset_entry[0]);
     const size_t rsdt_len = sizeof(*rsdt) + table_data_len;
@@ -1846,7 +1847,8 @@ build_rsdt(GArray *table_data, BIOSLinker *linker, GArray *table_offsets,
             ACPI_BUILD_TABLE_FILE, ref_tbl_offset);
     }
     build_header(linker, table_data,
-                 (void *)rsdt, "RSDT", rsdt_len, 1, oem_id, oem_table_id);
+                 (void *)(table_data->data + rsdt_start),
+                 "RSDT", rsdt_len, 1, oem_id, oem_table_id);
 }
 
 /* Build xsdt table */
@@ -1857,6 +1859,7 @@ build_xsdt(GArray *table_data, BIOSLinker *linker, GArray *table_offsets,
     int i;
     unsigned xsdt_entries_offset;
     AcpiXsdtDescriptorRev2 *xsdt;
+    int xsdt_start = table_data->len;
     const unsigned table_data_len = (sizeof(uint64_t) * table_offsets->len);
     const unsigned xsdt_entry_size = sizeof(xsdt->table_offset_entry[0]);
     const size_t xsdt_len = sizeof(*xsdt) + table_data_len;
@@ -1873,7 +1876,8 @@ build_xsdt(GArray *table_data, BIOSLinker *linker, GArray *table_offsets,
             ACPI_BUILD_TABLE_FILE, ref_tbl_offset);
     }
     build_header(linker, table_data,
-                 (void *)xsdt, "XSDT", xsdt_len, 1, oem_id, oem_table_id);
+                 (void *)(table_data->data + xsdt_start),
+                 "XSDT", xsdt_len, 1, oem_id, oem_table_id);
 }
 
 void build_srat_memory(AcpiSratMemoryAffinity *numamem, uint64_t base,
@@ -2053,10 +2057,9 @@ void build_tpm2(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
     uint64_t control_area_start_address;
     TPMIf *tpmif = tpm_find();
     uint32_t start_method;
-    void *tpm2_ptr;
 
     tpm2_start = table_data->len;
-    tpm2_ptr = acpi_data_push(table_data, sizeof(AcpiTableHeader));
+    acpi_data_push(table_data, sizeof(AcpiTableHeader));
 
     /* Platform Class */
     build_append_int_noprefix(table_data, TPM2_ACPI_CLASS_CLIENT, 2);
@@ -2095,8 +2098,8 @@ void build_tpm2(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
                                    log_addr_offset, 8,
                                    ACPI_BUILD_TPMLOG_FILE, 0);
     build_header(linker, table_data,
-                 tpm2_ptr, "TPM2", table_data->len - tpm2_start, 4, oem_id,
-                 oem_table_id);
+                 (void *)(table_data->data + tpm2_start),
+                 "TPM2", table_data->len - tpm2_start, 4, oem_id, oem_table_id);
 }
 
 Aml *build_crs(PCIHostState *host, CrsRangeSet *range_set, uint32_t io_offset,
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index de98750aef..daaf8f473e 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1816,6 +1816,7 @@ build_hpet(GArray *table_data, BIOSLinker *linker, const char *oem_id,
            const char *oem_table_id)
 {
     Acpi20Hpet *hpet;
+    int hpet_start = table_data->len;
 
     hpet = acpi_data_push(table_data, sizeof(*hpet));
     /* Note timer_block_id value must be kept in sync with value advertised by
@@ -1824,13 +1825,15 @@ build_hpet(GArray *table_data, BIOSLinker *linker, const char *oem_id,
     hpet->timer_block_id = cpu_to_le32(0x8086a201);
     hpet->addr.address = cpu_to_le64(HPET_BASE);
     build_header(linker, table_data,
-                 (void *)hpet, "HPET", sizeof(*hpet), 1, oem_id, oem_table_id);
+                 (void *)(table_data->data + hpet_start),
+                 "HPET", sizeof(*hpet), 1, oem_id, oem_table_id);
 }
 
 static void
 build_tpm_tcpa(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
                const char *oem_id, const char *oem_table_id)
 {
+    int tcpa_start = table_data->len;
     Acpi20Tcpa *tcpa = acpi_data_push(table_data, sizeof *tcpa);
     unsigned log_addr_size = sizeof(tcpa->log_area_start_address);
     unsigned log_addr_offset =
@@ -1849,7 +1852,8 @@ build_tpm_tcpa(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
         ACPI_BUILD_TPMLOG_FILE, 0);
 
     build_header(linker, table_data,
-                 (void *)tcpa, "TCPA", sizeof(*tcpa), 2, oem_id, oem_table_id);
+                 (void *)(table_data->data + tcpa_start),
+                 "TCPA", sizeof(*tcpa), 2, oem_id, oem_table_id);
 }
 
 #define HOLE_640K_START  (640 * KiB)
-- 
2.27.0