[PATCH v2 1/2] acpi: Make TPM version configurable.

[Jennifer Herbert <jennifer.herbert@xxxxxxxxxx>]

This patch makes the TPM version, for which the ACPI library probes, 
configurable.
If acpi_config.tpm_verison is set to 1, it indicates that 1.2 (TCPA) should be 
probed.
I have also added to hvmloader an option to allow setting this new config, 
which can
be triggered by setting the platform/tpm_verion xenstore key.

Signed-off-by: Jennifer Herbert <jennifer.herbert@xxxxxxxxxx>
---
 docs/misc/xenstore-paths.pandoc |  8 ++++
 tools/firmware/hvmloader/util.c | 13 ++++++-
 tools/libacpi/build.c           | 68 ++++++++++++++++++---------------
 tools/libacpi/libacpi.h         |  4 +-
 4 files changed, 59 insertions(+), 34 deletions(-)

diff --git a/docs/misc/xenstore-paths.pandoc b/docs/misc/xenstore-paths.pandoc
index 5cd5c8a3b9..7270b46721 100644
--- a/docs/misc/xenstore-paths.pandoc
+++ b/docs/misc/xenstore-paths.pandoc
@@ -269,6 +269,14 @@ at the guest physical address in 
HVM_PARAM_VM_GENERATION_ID_ADDR.
 See Microsoft's "Virtual Machine Generation ID" specification for the
 circumstances where the generation ID needs to be changed.
 
+
+#### ~/platform/tpm_version = INTEGER [HVM,INTERNAL]
+
+The TPM version to be probed for.
+
+A value of 1 indicates to probe for TPM 1.2. If unset, or an
+invalid version, then no TPM is probed.
+
 ### Frontend device paths
 
 Paravirtual device frontends are generally specified by their own
diff --git a/tools/firmware/hvmloader/util.c b/tools/firmware/hvmloader/util.c
index 581b35e5cf..87bc2d677f 100644
--- a/tools/firmware/hvmloader/util.c
+++ b/tools/firmware/hvmloader/util.c
@@ -994,13 +994,22 @@ void hvmloader_acpi_build_tables(struct acpi_config 
*config,
     if ( !strncmp(xenstore_read("platform/acpi_laptop_slate", "0"), "1", 1)  )
         config->table_flags |= ACPI_HAS_SSDT_LAPTOP_SLATE;
 
-    config->table_flags |= (ACPI_HAS_TCPA | ACPI_HAS_IOAPIC |
+    config->table_flags |= (ACPI_HAS_TPM | ACPI_HAS_IOAPIC |
                             ACPI_HAS_WAET | ACPI_HAS_PMTIMER |
                             ACPI_HAS_BUTTONS | ACPI_HAS_VGA |
                             ACPI_HAS_8042 | ACPI_HAS_CMOS_RTC);
     config->acpi_revision = 4;
 
-    config->tis_hdr = (uint16_t *)ACPI_TIS_HDR_ADDRESS;
+    s = xenstore_read("platform/tpm_version", "0");
+    config->tpm_version = strtoll(s, NULL, 0);
+
+    switch( config->tpm_version )
+    {
+    case 1:
+        config->table_flags |= ACPI_HAS_TPM;
+        config->tis_hdr = (uint16_t *)ACPI_TIS_HDR_ADDRESS;
+        break;
+    }
 
     config->numa.nr_vmemranges = nr_vmemranges;
     config->numa.nr_vnodes = nr_vnodes;
diff --git a/tools/libacpi/build.c b/tools/libacpi/build.c
index fe2db66a62..d313ccd8cf 100644
--- a/tools/libacpi/build.c
+++ b/tools/libacpi/build.c
@@ -409,38 +409,46 @@ static int construct_secondary_tables(struct acpi_ctxt 
*ctxt,
         memcpy(ssdt, ssdt_laptop_slate, sizeof(ssdt_laptop_slate));
         table_ptrs[nr_tables++] = ctxt->mem_ops.v2p(ctxt, ssdt);
     }
-
-    /* TPM TCPA and SSDT. */
-    if ( (config->table_flags & ACPI_HAS_TCPA) &&
-         (config->tis_hdr[0] != 0 && config->tis_hdr[0] != 0xffff) &&
-         (config->tis_hdr[1] != 0 && config->tis_hdr[1] != 0xffff) )
+    /* TPM and SSDT. */
+    if (config->table_flags & ACPI_HAS_TPM)
     {
-        ssdt = ctxt->mem_ops.alloc(ctxt, sizeof(ssdt_tpm), 16);
-        if (!ssdt) return -1;
-        memcpy(ssdt, ssdt_tpm, sizeof(ssdt_tpm));
-        table_ptrs[nr_tables++] = ctxt->mem_ops.v2p(ctxt, ssdt);
-
-        tcpa = ctxt->mem_ops.alloc(ctxt, sizeof(struct acpi_20_tcpa), 16);
-        if (!tcpa) return -1;
-        memset(tcpa, 0, sizeof(*tcpa));
-        table_ptrs[nr_tables++] = ctxt->mem_ops.v2p(ctxt, tcpa);
-
-        tcpa->header.signature = ACPI_2_0_TCPA_SIGNATURE;
-        tcpa->header.length    = sizeof(*tcpa);
-        tcpa->header.revision  = ACPI_2_0_TCPA_REVISION;
-        fixed_strcpy(tcpa->header.oem_id, ACPI_OEM_ID);
-        fixed_strcpy(tcpa->header.oem_table_id, ACPI_OEM_TABLE_ID);
-        tcpa->header.oem_revision = ACPI_OEM_REVISION;
-        tcpa->header.creator_id   = ACPI_CREATOR_ID;
-        tcpa->header.creator_revision = ACPI_CREATOR_REVISION;
-        if ( (lasa = ctxt->mem_ops.alloc(ctxt, ACPI_2_0_TCPA_LAML_SIZE, 16)) 
!= NULL )
+        switch (config->tpm_version)
         {
-            tcpa->lasa = ctxt->mem_ops.v2p(ctxt, lasa);
-            tcpa->laml = ACPI_2_0_TCPA_LAML_SIZE;
-            memset(lasa, 0, tcpa->laml);
-            set_checksum(tcpa,
-                         offsetof(struct acpi_header, checksum),
-                         tcpa->header.length);
+        case 1:
+            if (!config->tis_hdr ||
+                config->tis_hdr[0] == 0 || config->tis_hdr[0] == 0xffff ||
+                config->tis_hdr[1] == 0 || config->tis_hdr[1] == 0xffff)
+                break;
+
+            ssdt = ctxt->mem_ops.alloc(ctxt, sizeof(ssdt_tpm), 16);
+            if (!ssdt) return -1;
+            memcpy(ssdt, ssdt_tpm, sizeof(ssdt_tpm));
+            table_ptrs[nr_tables++] = ctxt->mem_ops.v2p(ctxt, ssdt);
+
+            tcpa = ctxt->mem_ops.alloc(ctxt, sizeof(struct acpi_20_tcpa), 16);
+            if (!tcpa) return -1;
+            memset(tcpa, 0, sizeof(*tcpa));
+            table_ptrs[nr_tables++] = ctxt->mem_ops.v2p(ctxt, tcpa);
+
+            tcpa->header.signature = ACPI_2_0_TCPA_SIGNATURE;
+            tcpa->header.length    = sizeof(*tcpa);
+            tcpa->header.revision  = ACPI_2_0_TCPA_REVISION;
+            fixed_strcpy(tcpa->header.oem_id, ACPI_OEM_ID);
+            fixed_strcpy(tcpa->header.oem_table_id, ACPI_OEM_TABLE_ID);
+            tcpa->header.oem_revision = ACPI_OEM_REVISION;
+            tcpa->header.creator_id   = ACPI_CREATOR_ID;
+            tcpa->header.creator_revision = ACPI_CREATOR_REVISION;
+
+            if ( (lasa = ctxt->mem_ops.alloc(ctxt, ACPI_2_0_TCPA_LAML_SIZE, 
16)) != NULL )
+            {
+                tcpa->lasa = ctxt->mem_ops.v2p(ctxt, lasa);
+                tcpa->laml = ACPI_2_0_TCPA_LAML_SIZE;
+                memset(lasa, 0, tcpa->laml);
+                set_checksum(tcpa,
+                             offsetof(struct acpi_header, checksum),
+                             tcpa->header.length);
+            }
+            break;
         }
     }
 
diff --git a/tools/libacpi/libacpi.h b/tools/libacpi/libacpi.h
index a2efd23b0b..9143616130 100644
--- a/tools/libacpi/libacpi.h
+++ b/tools/libacpi/libacpi.h
@@ -27,7 +27,7 @@
 #define ACPI_HAS_SSDT_PM           (1<<4)
 #define ACPI_HAS_SSDT_S3           (1<<5)
 #define ACPI_HAS_SSDT_S4           (1<<6)
-#define ACPI_HAS_TCPA              (1<<7)
+#define ACPI_HAS_TPM               (1<<7)
 #define ACPI_HAS_IOAPIC            (1<<8)
 #define ACPI_HAS_WAET              (1<<9)
 #define ACPI_HAS_PMTIMER           (1<<10)
@@ -78,8 +78,8 @@ struct acpi_config {
     struct acpi_numa numa;
     const struct hvm_info_table *hvminfo;
 
+    uint8_t tpm_version;
     const uint16_t *tis_hdr;
-
     /*
      * Address where acpi_info should be placed.
      * This must match the OperationRegion(BIOS, SystemMemory, ....)
-- 
2.31.1