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tpm: allocate/map buffer for TPM Physical Presence interface

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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>
This commit is contained in:
Stefan Berger 2019-01-15 02:27:50 +04:00 • committed by Michael S. Tsirkin
parent b6148757f9
commit 3b97c01e9c
6 changed files with 88 additions and 0 deletions
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7
hw/tpm/tpm_tis.c
View file

@ -31,6 +31,7 @@
#include "sysemu/tpm_backend.h"
#include "tpm_int.h"
#include "tpm_util.h"
#include "tpm_ppi.h"
#include "trace.h"
#define TPM_TIS_NUM_LOCALITIES 5 /* per spec */
@ -83,6 +84,7 @@ typedef struct TPMState {
size_t be_buffer_size;
bool ppi_enabled;
TPMPPI ppi;
} TPMState;
#define TPM(obj) OBJECT_CHECK(TPMState, (obj), TYPE_TPM_TIS)
@ -983,6 +985,11 @@ static void tpm_tis_realizefn(DeviceState *dev, Error **errp)
memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)),
TPM_TIS_ADDR_BASE, &s->mmio);
if (s->ppi_enabled) {
tpm_ppi_init(&s->ppi, isa_address_space(ISA_DEVICE(dev)),
TPM_PPI_ADDR_BASE, OBJECT(s));
}
}
static void tpm_tis_initfn(Object *obj)