[Qemu-devel] [PATCH v2 2/4] acpi: build QEMU table for PPI virtual memory device

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

To avoid having to hard code the base address of the PPI virtual memory
device we introduce a QEMU ACPI table that holds the base address, if a
TPM 1.2 or 2 is used. This table gives us flexibility to move the base
address later on.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
---
 hw/i386/acpi-build.c        | 19 +++++++++++++++++++
 include/hw/acpi/acpi-defs.h |  8 ++++++++
 2 files changed, 27 insertions(+)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 18b939e..522d6d2 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2628,6 +2628,20 @@ static bool acpi_get_mcfg(AcpiMcfgInfo *mcfg)
     return true;
 }
 
+static void build_qemu(GArray *table_data, BIOSLinker *linker,
+                       TPMVersion tpm_version)
+{
+    AcpiTableQemu *qemu = acpi_data_push(table_data, sizeof(*qemu));
+
+    if (tpm_version != TPM_VERSION_UNSPEC) {
+        qemu->tpmppi_addr = TPM_PPI_ADDR_BASE;
+        qemu->tpm_version = tpm_version;
+    }
+
+    build_header(linker, table_data,
+                 (void *)qemu, "QEMU", sizeof(*qemu), 1, "QEMU", "CONF");
+}
+
 static
 void acpi_build(AcpiBuildTables *tables, MachineState *machine)
 {
@@ -2734,6 +2748,11 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
                           &pcms->acpi_nvdimm_state, machine->ram_slots);
     }
 
+    if (misc.tpm_version != TPM_VERSION_UNSPEC) {
+        acpi_add_table(table_offsets, tables_blob);
+        build_qemu(tables_blob, tables->linker, misc.tpm_version);
+    }
+
     /* Add tables supplied by user (if any) */
     for (u = acpi_table_first(); u; u = acpi_table_next(u)) {
         unsigned len = acpi_table_len(u);
diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
index 80c8099..98764c1 100644
--- a/include/hw/acpi/acpi-defs.h
+++ b/include/hw/acpi/acpi-defs.h
@@ -573,6 +573,14 @@ struct Acpi20TPM2 {
 } QEMU_PACKED;
 typedef struct Acpi20TPM2 Acpi20TPM2;
 
+/* QEMU - Custom QEMU table */
+struct AcpiTableQemu {
+    ACPI_TABLE_HEADER_DEF
+    uint32_t tpmppi_addr;
+    uint8_t tpm_version; /* 1 = 1.2, 2 = 2 */
+};
+typedef struct AcpiTableQemu AcpiTableQemu;
+
 /* DMAR - DMA Remapping table r2.2 */
 struct AcpiTableDmar {
     ACPI_TABLE_HEADER_DEF
-- 
2.5.5