[Qemu-devel] [PATCH 1/4] pc: append ssdt-misc.dsl to the DSDT

[Paolo Bonzini <pbonzini@redhat.com>]

This part of the ACPI tables can vary in size across machine types, but
does not depend on the command-line.  It is an SSDT just because it is
the same for i440fx and Q35, and making it an SSDT made the code a bit
simpler.  However, it also complicates backwards compatibility, so
merge it with the DSDT.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/i386/acpi-build.c | 54 ++++++++++++++++++++++++++++++++++------------------
 1 file changed, 35 insertions(+), 19 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index a4d0c0c..c8088f1 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1061,26 +1061,17 @@ static void patch_pci_windows(PcPciInfo *pci, uint8_t *start, unsigned size)
     }
 }
 
-static void
-build_ssdt(GArray *table_data, GArray *linker,
-           AcpiCpuInfo *cpu, AcpiPmInfo *pm, AcpiMiscInfo *misc,
-           PcPciInfo *pci, PcGuestInfo *guest_info)
+static size_t
+append_ssdt_misc(GArray *table_data, AcpiPmInfo *pm, AcpiMiscInfo *misc,
+                 PcPciInfo *pci)
 {
     MachineState *machine = MACHINE(qdev_get_machine());
     uint32_t nr_mem = machine->ram_slots;
-    unsigned acpi_cpus = guest_info->apic_id_limit;
-    int ssdt_start = table_data->len;
+    size_t size = sizeof(ssdp_misc_aml) - sizeof(AcpiTableHeader);
     uint8_t *ssdt_ptr;
-    int i;
-
-    /* The current AML generator can cover the APIC ID range [0..255],
-     * inclusive, for VCPU hotplug. */
-    QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256);
-    g_assert(acpi_cpus <= ACPI_CPU_HOTPLUG_ID_LIMIT);
 
     /* Copy header and patch values in the S3_ / S4_ / S5_ packages */
-    ssdt_ptr = acpi_data_push(table_data, sizeof(ssdp_misc_aml));
-    memcpy(ssdt_ptr, ssdp_misc_aml, sizeof(ssdp_misc_aml));
+    ssdt_ptr = g_memdup(ssdp_misc_aml, sizeof(ssdp_misc_aml));
     if (pm->s3_disabled) {
         ssdt_ptr[acpi_s3_name[0]] = 'X';
     }
@@ -1099,6 +1090,29 @@ build_ssdt(GArray *table_data, GArray *linker,
     ACPI_BUILD_SET_LE(ssdt_ptr, sizeof(ssdp_misc_aml),
                       ssdt_mctrl_nr_slots[0], 32, nr_mem);
 
+    memcpy(acpi_data_push(table_data, size),
+           ssdt_ptr + sizeof(AcpiTableHeader), size);
+    g_free(ssdt_ptr);
+    return size;
+}
+
+static void
+build_ssdt(GArray *table_data, GArray *linker,
+           AcpiCpuInfo *cpu, AcpiPmInfo *pm, PcGuestInfo *guest_info)
+{
+    MachineState *machine = MACHINE(qdev_get_machine());
+    uint32_t nr_mem = machine->ram_slots;
+    unsigned acpi_cpus = guest_info->apic_id_limit;
+    int ssdt_start = table_data->len;
+    int i;
+
+    acpi_data_push(table_data, sizeof(AcpiTableHeader));
+
+    /* The current AML generator can cover the APIC ID range [0..255],
+     * inclusive, for VCPU hotplug. */
+    QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256);
+    g_assert(acpi_cpus <= ACPI_CPU_HOTPLUG_ID_LIMIT);
+
     {
         GArray *sb_scope = build_alloc_array();
         uint8_t op = 0x10; /* ScopeOp */
@@ -1423,18 +1437,21 @@ build_dmar_q35(GArray *table_data, GArray *linker)
 }
 
 static void
-build_dsdt(GArray *table_data, GArray *linker, AcpiMiscInfo *misc)
+build_dsdt(GArray *table_data, GArray *linker, AcpiPmInfo *pm,
+           AcpiMiscInfo *misc, PcPciInfo *pci)
 {
     AcpiTableHeader *dsdt;
+    size_t ssdt_misc_size;
 
     assert(misc->dsdt_code && misc->dsdt_size);
 
     dsdt = acpi_data_push(table_data, misc->dsdt_size);
     memcpy(dsdt, misc->dsdt_code, misc->dsdt_size);
+    ssdt_misc_size = append_ssdt_misc(table_data, pm, misc, pci);
 
     memset(dsdt, 0, sizeof *dsdt);
     build_header(linker, table_data, dsdt, "DSDT",
-                 misc->dsdt_size, 1);
+                 misc->dsdt_size + ssdt_misc_size, 1);
 }
 
 /* Build final rsdt table */
@@ -1591,7 +1608,7 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
 
     /* DSDT is pointed to by FADT */
     dsdt = tables->table_data->len;
-    build_dsdt(tables->table_data, tables->linker, &misc);
+    build_dsdt(tables->table_data, tables->linker, &pm, &misc, &pci);
 
     /* Count the size of the DSDT and SSDT, we will need it for legacy
      * sizing of ACPI tables.
@@ -1604,8 +1621,7 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
 
     ssdt = tables->table_data->len;
     acpi_add_table(table_offsets, tables->table_data);
-    build_ssdt(tables->table_data, tables->linker, &cpu, &pm, &misc, &pci,
-               guest_info);
+    build_ssdt(tables->table_data, tables->linker, &cpu, &pm, guest_info);
     aml_len += tables->table_data->len - ssdt;
 
     acpi_add_table(table_offsets, tables->table_data);
-- 
1.8.3.1