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acpi: expose TPM/PPI configuration parameters to firmware via fw_cfg

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To avoid having to hard code the base address of the PPI virtual
memory device we introduce a fw_cfg file etc/tpm/config that holds the
base address of the PPI device, the version of the PPI interface and
the version of the attached TPM.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
[ Marc-André: renamed to etc/tpm/config, made it static, document it ]
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Michael S. Tsirkin <mst@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 02:27:51 +04:00 • committed by Michael S. Tsirkin
parent 3b97c01e9c
commit 0fe2466903
3 changed files with 41 additions and 0 deletions
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19
docs/specs/tpm.txt
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@ -34,6 +34,25 @@ The CRB interface makes a memory mapped IO region in the area 0xfed40000 -
QEMU files related to TPM CRB interface:
- hw/tpm/tpm_crb.c
= fw_cfg interface =
The bios/firmware may read the "etc/tpm/config" fw_cfg entry for
configuring the guest appropriately.
The entry of 6 bytes has the following content, in little-endian:
#define TPM_VERSION_UNSPEC 0
#define TPM_VERSION_1_2 1
#define TPM_VERSION_2_0 2
#define TPM_PPI_VERSION_NONE 0
#define TPM_PPI_VERSION_1_30 1
struct FwCfgTPMConfig {
uint32_t tpmppi_address; /* PPI memory location */
uint8_t tpm_version; /* TPM version */
uint8_t tpmppi_version; /* PPI version */
};
= ACPI Interface =