[Qemu-devel] [RFC 44/47] pc: acpi-build: prepare to make ACPI tables blob opaque for table building functions

[Igor Mammedov <imammedo@redhat.com>]

it allows to hide linker and direct access to table's
storage from table building function if it would use
acpi_def_block() to declare table and ASL/AML API to
compose it. Which following patch will do for
build_ssdt() function.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
PS:
 this series does it only for build_ssdt(), but it also
 could be done for other tables later by using there
 acpi_def_block() to describe table's header and
 adding addtional API to compose table's entries.
---
 hw/i386/acpi-build.c | 85 ++++++++++++++++++++++++++--------------------------
 1 file changed, 43 insertions(+), 42 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 3a22bdb..347448b 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1253,7 +1253,7 @@ build_rsdp(GArray *rsdp_table, GArray *linker, unsigned rsdt)
 
 typedef
 struct AcpiBuildTables {
-    GArray *table_data;
+    AcpiAml table_data;
     GArray *rsdp;
     GArray *tcpalog;
     GArray *linker;
@@ -1262,9 +1262,10 @@ struct AcpiBuildTables {
 static inline void acpi_build_tables_init(AcpiBuildTables *tables)
 {
     tables->rsdp = g_array_new(false, true /* clear */, 1);
-    tables->table_data = g_array_new(false, true /* clear */, 1);
+    tables->table_data.buf = g_array_new(false, true /* clear */, 1);
     tables->tcpalog = g_array_new(false, true /* clear */, 1);
     tables->linker = bios_linker_loader_init();
+    tables->table_data.linker = tables->linker;
 }
 
 static inline void acpi_build_tables_cleanup(AcpiBuildTables *tables, bool mfre)
@@ -1272,7 +1273,7 @@ static inline void acpi_build_tables_cleanup(AcpiBuildTables *tables, bool mfre)
     void *linker_data = bios_linker_loader_cleanup(tables->linker);
     g_free(linker_data);
     g_array_free(tables->rsdp, mfre);
-    g_array_free(tables->table_data, true);
+    g_array_free(tables->table_data.buf, true);
     g_array_free(tables->tcpalog, mfre);
 }
 
@@ -1352,66 +1353,66 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
      * We place it first since it's the only table that has alignment
      * requirements.
      */
-    facs = tables->table_data->len;
-    build_facs(tables->table_data, tables->linker, guest_info);
+    facs = tables->table_data.buf->len;
+    build_facs(tables->table_data.buf, tables->linker, guest_info);
 
     /* DSDT is pointed to by FADT */
-    dsdt = tables->table_data->len;
-    build_dsdt(tables->table_data, tables->linker, &misc);
+    dsdt = tables->table_data.buf->len;
+    build_dsdt(tables->table_data.buf, tables->linker, &misc);
 
     /* Count the size of the DSDT and SSDT, we will need it for legacy
      * sizing of ACPI tables.
      */
-    aml_len += tables->table_data->len - dsdt;
+    aml_len += tables->table_data.buf->len - dsdt;
 
     /* ACPI tables pointed to by RSDT */
-    acpi_add_table(table_offsets, tables->table_data);
-    build_fadt(tables->table_data, tables->linker, &pm, facs, dsdt);
+    acpi_add_table(table_offsets, tables->table_data.buf);
+    build_fadt(tables->table_data.buf, tables->linker, &pm, facs, dsdt);
 
-    ssdt = tables->table_data->len;
-    acpi_add_table(table_offsets, tables->table_data);
-    build_ssdt(tables->table_data, tables->linker, &cpu, &pm, &misc, &pci,
+    ssdt = tables->table_data.buf->len;
+    acpi_add_table(table_offsets, tables->table_data.buf);
+    build_ssdt(tables->table_data.buf, tables->linker, &cpu, &pm, &misc, &pci,
                guest_info);
-    aml_len += tables->table_data->len - ssdt;
+    aml_len += tables->table_data.buf->len - ssdt;
 
-    acpi_add_table(table_offsets, tables->table_data);
-    build_madt(tables->table_data, tables->linker, &cpu, guest_info);
+    acpi_add_table(table_offsets, tables->table_data.buf);
+    build_madt(tables->table_data.buf, tables->linker, &cpu, guest_info);
 
     if (misc.has_hpet) {
-        acpi_add_table(table_offsets, tables->table_data);
-        build_hpet(tables->table_data, tables->linker);
+        acpi_add_table(table_offsets, tables->table_data.buf);
+        build_hpet(tables->table_data.buf, tables->linker);
     }
     if (misc.has_tpm) {
-        acpi_add_table(table_offsets, tables->table_data);
-        build_tpm_tcpa(tables->table_data, tables->linker, tables->tcpalog);
+        acpi_add_table(table_offsets, tables->table_data.buf);
+        build_tpm_tcpa(tables->table_data.buf, tables->linker, tables->tcpalog);
 
-        acpi_add_table(table_offsets, tables->table_data);
-        build_tpm_ssdt(tables->table_data, tables->linker);
+        acpi_add_table(table_offsets, tables->table_data.buf);
+        build_tpm_ssdt(tables->table_data.buf, tables->linker);
     }
     if (guest_info->numa_nodes) {
-        acpi_add_table(table_offsets, tables->table_data);
-        build_srat(tables->table_data, tables->linker, guest_info);
+        acpi_add_table(table_offsets, tables->table_data.buf);
+        build_srat(tables->table_data.buf, tables->linker, guest_info);
     }
     if (acpi_get_mcfg(&mcfg)) {
-        acpi_add_table(table_offsets, tables->table_data);
-        build_mcfg_q35(tables->table_data, tables->linker, &mcfg);
+        acpi_add_table(table_offsets, tables->table_data.buf);
+        build_mcfg_q35(tables->table_data.buf, tables->linker, &mcfg);
     }
     if (acpi_has_iommu()) {
-        acpi_add_table(table_offsets, tables->table_data);
-        build_dmar_q35(tables->table_data, tables->linker);
+        acpi_add_table(table_offsets, tables->table_data.buf);
+        build_dmar_q35(tables->table_data.buf, tables->linker);
     }
 
     /* Add tables supplied by user (if any) */
     for (u = acpi_table_first(); u; u = acpi_table_next(u)) {
         unsigned len = acpi_table_len(u);
 
-        acpi_add_table(table_offsets, tables->table_data);
-        g_array_append_vals(tables->table_data, u, len);
+        acpi_add_table(table_offsets, tables->table_data.buf);
+        g_array_append_vals(tables->table_data.buf, u, len);
     }
 
     /* RSDT is pointed to by RSDP */
-    rsdt = tables->table_data->len;
-    build_rsdt(tables->table_data, tables->linker, table_offsets);
+    rsdt = tables->table_data.buf->len;
+    build_rsdt(tables->table_data.buf, tables->linker, table_offsets);
 
     /* RSDP is in FSEG memory, so allocate it separately */
     build_rsdp(tables->rsdp, tables->linker, rsdt);
@@ -1443,23 +1444,23 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
             guest_info->legacy_acpi_table_size +
             ACPI_BUILD_LEGACY_CPU_AML_SIZE * max_cpus;
         int legacy_table_size =
-            ROUND_UP(tables->table_data->len - aml_len + legacy_aml_len,
+            ROUND_UP(tables->table_data.buf->len - aml_len + legacy_aml_len,
                      ACPI_BUILD_ALIGN_SIZE);
-        if (tables->table_data->len > legacy_table_size) {
+        if (tables->table_data.buf->len > legacy_table_size) {
             /* Should happen only with PCI bridges and -M pc-i440fx-2.0.  */
             error_report("Warning: migration may not work.");
         }
-        g_array_set_size(tables->table_data, legacy_table_size);
+        g_array_set_size(tables->table_data.buf, legacy_table_size);
     } else {
         /* Make sure we have a buffer in case we need to resize the tables. */
-        if (tables->table_data->len > ACPI_BUILD_TABLE_SIZE / 2) {
+        if (tables->table_data.buf->len > ACPI_BUILD_TABLE_SIZE / 2) {
             /* As of QEMU 2.1, this fires with 160 VCPUs and 255 memory slots.  */
             error_report("Warning: ACPI tables are larger than 64k.");
             error_report("Warning: migration may not work.");
             error_report("Warning: please remove CPUs, NUMA nodes, "
                          "memory slots or PCI bridges.");
         }
-        acpi_align_size(tables->table_data, ACPI_BUILD_TABLE_SIZE);
+        acpi_align_size(tables->table_data.buf, ACPI_BUILD_TABLE_SIZE);
     }
 
     acpi_align_size(tables->linker, ACPI_BUILD_ALIGN_SIZE);
@@ -1483,8 +1484,8 @@ static void acpi_build_update(void *build_opaque, uint32_t offset)
 
     acpi_build(build_state->guest_info, &tables);
 
-    assert(acpi_data_len(tables.table_data) == build_state->table_size);
-    memcpy(qemu_get_ram_ptr(build_state->table_ram), tables.table_data->data,
+    assert(acpi_data_len(tables.table_data.buf) == build_state->table_size);
+    memcpy(qemu_get_ram_ptr(build_state->table_ram), tables.table_data.buf->data,
            build_state->table_size);
 
     cpu_physical_memory_set_dirty_range_nocode(build_state->table_ram,
@@ -1546,10 +1547,10 @@ void acpi_setup(PcGuestInfo *guest_info)
     acpi_build(build_state->guest_info, &tables);
 
     /* Now expose it all to Guest */
-    build_state->table_ram = acpi_add_rom_blob(build_state, tables.table_data,
-                                               ACPI_BUILD_TABLE_FILE);
+    build_state->table_ram = acpi_add_rom_blob(build_state,
+        tables.table_data.buf, ACPI_BUILD_TABLE_FILE);
     assert(build_state->table_ram != RAM_ADDR_MAX);
-    build_state->table_size = acpi_data_len(tables.table_data);
+    build_state->table_size = acpi_data_len(tables.table_data.buf);
 
     acpi_add_rom_blob(NULL, tables.linker, "etc/table-loader");
 
-- 
1.8.3.1