tpm: allocate/map buffer for TPM Physical Presence interface

Implement a virtual memory device for the TPM Physical Presence interface.
The memory is located at 0xFED45000 and used by ACPI to send messages to the
firmware (BIOS) and by the firmware to provide parameters for each one of
the supported codes.

This interface should be used by all TPM devices on x86 and can be
added by calling tpm_ppi_init_io().

Note: bios_linker cannot be used to allocate the PPI memory region,
since the reserved memory should stay stable across reboots, and might
be needed before the ACPI tables are installed.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c
index d5b0ac5920..012ec686d4 100644
--- a/hw/tpm/tpm_crb.c
+++ b/hw/tpm/tpm_crb.c
@@ -29,6 +29,7 @@
 #include "sysemu/reset.h"
 #include "tpm_int.h"
 #include "tpm_util.h"
+#include "tpm_ppi.h"
 #include "trace.h"
 
 typedef struct CRBState {
@@ -43,6 +44,7 @@ typedef struct CRBState {
     size_t be_buffer_size;
 
     bool ppi_enabled;
+    TPMPPI ppi;
 } CRBState;
 
 #define CRB(obj) OBJECT_CHECK(CRBState, (obj), TYPE_TPM_CRB)
@@ -294,6 +296,11 @@ static void tpm_crb_realize(DeviceState *dev, Error **errp)
     memory_region_add_subregion(get_system_memory(),
         TPM_CRB_ADDR_BASE + sizeof(s->regs), &s->cmdmem);
 
+    if (s->ppi_enabled) {
+        tpm_ppi_init(&s->ppi, get_system_memory(),
+                     TPM_PPI_ADDR_BASE, OBJECT(s));
+    }
+
     qemu_register_reset(tpm_crb_reset, dev);
 }