Re: [PATCH-for-9.1 05/18] hw/i386/acpi: Remove PCMachineClass::legacy_acpi_table_size

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On 05/03/2024 14.42, Philippe Mathieu-Daudé wrote:
PCMachineClass::legacy_acpi_table_size was only used by the
pc-i440fx-2.0 machine, which got removed. Remove it and simplify
acpi_build().

Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
---
  include/hw/i386/pc.h |  1 -
  hw/i386/acpi-build.c | 60 +++++++++-----------------------------------
  2 files changed, 12 insertions(+), 49 deletions(-)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 3360ca2307..758d670a36 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -103,7 +103,6 @@ struct PCMachineClass {
      /* ACPI compat: */
      bool has_acpi_build;
      bool rsdp_in_ram;
-    int legacy_acpi_table_size;
      unsigned acpi_data_size;
      int pci_root_uid;
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 15242b9096..8c7fad92e9 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2496,13 +2496,12 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
      X86MachineState *x86ms = X86_MACHINE(machine);
      DeviceState *iommu = pcms->iommu;
      GArray *table_offsets;
-    unsigned facs, dsdt, rsdt, fadt;
+    unsigned facs, dsdt, rsdt;
      AcpiPmInfo pm;
      AcpiMiscInfo misc;
      AcpiMcfgInfo mcfg;
      Range pci_hole = {}, pci_hole64 = {};
      uint8_t *u;
-    size_t aml_len = 0;
      GArray *tables_blob = tables->table_data;
      AcpiSlicOem slic_oem = { .id = NULL, .table_id = NULL };
      Object *vmgenid_dev;
@@ -2548,19 +2547,12 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
      build_dsdt(tables_blob, tables->linker, &pm, &misc,
                 &pci_hole, &pci_hole64, machine);
- /* Count the size of the DSDT and SSDT, we will need it for legacy
-     * sizing of ACPI tables.
-     */
-    aml_len += tables_blob->len - dsdt;
-
      /* ACPI tables pointed to by RSDT */
-    fadt = tables_blob->len;
      acpi_add_table(table_offsets, tables_blob);
      pm.fadt.facs_tbl_offset = &facs;
      pm.fadt.dsdt_tbl_offset = &dsdt;
      pm.fadt.xdsdt_tbl_offset = &dsdt;
      build_fadt(tables_blob, tables->linker, &pm.fadt, oem_id, oem_table_id);
-    aml_len += tables_blob->len - fadt;
acpi_add_table(table_offsets, tables_blob);
      acpi_build_madt(tables_blob, tables->linker, x86ms,
@@ -2691,49 +2683,21 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
       * too simple to be enough.  4k turned out to be too small an
       * alignment very soon, and in fact it is almost impossible to
       * keep the table size stable for all (max_cpus, max_memory_slots)
-     * combinations.  So the table size is always 64k for pc-i440fx-2.1
-     * and we give an error if the table grows beyond that limit.
-     *
-     * We still have the problem of migrating from "-M pc-i440fx-2.0".  For
-     * that, we exploit the fact that QEMU 2.1 generates _smaller_ tables
-     * than 2.0 and we can always pad the smaller tables with zeros.  We can
-     * then use the exact size of the 2.0 tables.
+     * combinations.
       *
       * All this is for PIIX4, since QEMU 2.0 didn't support Q35 migration.

I think you could remove this "All this is for ..." sentence now, too?

 Thomas


       */
-    if (pcmc->legacy_acpi_table_size) {
-        /* Subtracting aml_len gives the size of fixed tables.  Then add the
-         * size of the PIIX4 DSDT/SSDT in QEMU 2.0.
-         */
-        int legacy_aml_len =
-            pcmc->legacy_acpi_table_size +
-            ACPI_BUILD_LEGACY_CPU_AML_SIZE * x86ms->apic_id_limit;
-        int legacy_table_size =
-            ROUND_UP(tables_blob->len - aml_len + legacy_aml_len,
-                     ACPI_BUILD_ALIGN_SIZE);
-        if ((tables_blob->len > legacy_table_size) &&
-            !pcmc->resizable_acpi_blob) {
-            /* Should happen only with PCI bridges and -M pc-i440fx-2.0.  */
-            warn_report("ACPI table size %u exceeds %d bytes,"
-                        " migration may not work",
-                        tables_blob->len, legacy_table_size);
-            error_printf("Try removing CPUs, NUMA nodes, memory slots"
-                         " or PCI bridges.\n");
-        }
-        g_array_set_size(tables_blob, legacy_table_size);
-    } else {
-        /* Make sure we have a buffer in case we need to resize the tables. */
-        if ((tables_blob->len > ACPI_BUILD_TABLE_SIZE / 2) &&
-            !pcmc->resizable_acpi_blob) {
-            /* As of QEMU 2.1, this fires with 160 VCPUs and 255 memory slots.  */
-            warn_report("ACPI table size %u exceeds %d bytes,"
-                        " migration may not work",
-                        tables_blob->len, ACPI_BUILD_TABLE_SIZE / 2);
-            error_printf("Try removing CPUs, NUMA nodes, memory slots"
-                         " or PCI bridges.\n");
-        }
-        acpi_align_size(tables_blob, ACPI_BUILD_TABLE_SIZE);
+    /* Make sure we have a buffer in case we need to resize the tables. */
+    if ((tables_blob->len > ACPI_BUILD_TABLE_SIZE / 2) &&
+        !pcmc->resizable_acpi_blob) {
+        /* As of QEMU 2.1, this fires with 160 VCPUs and 255 memory slots.  */
+        warn_report("ACPI table size %u exceeds %d bytes,"
+                    " migration may not work",
+                    tables_blob->len, ACPI_BUILD_TABLE_SIZE / 2);
+        error_printf("Try removing CPUs, NUMA nodes, memory slots"
+                     " or PCI bridges.\n");
      }
+    acpi_align_size(tables_blob, ACPI_BUILD_TABLE_SIZE);
acpi_align_size(tables->linker->cmd_blob, ACPI_BUILD_ALIGN_SIZE);
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