From 0fe246690315335a40a132f05cb6fdc7bfb9adca Mon Sep 17 00:00:00 2001 From: Stefan Berger Date: Tue, 15 Jan 2019 02:27:51 +0400 Subject: acpi: expose TPM/PPI configuration parameters to firmware via fw_cfg MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 [ Marc-André: renamed to etc/tpm/config, made it static, document it ] Signed-off-by: Marc-André Lureau Acked-by: Michael S. Tsirkin Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Michael S. Tsirkin Tested-by: Stefan Berger Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- docs/specs/tpm.txt | 19 +++++++++++++++++++ hw/i386/acpi-build.c | 19 +++++++++++++++++++ include/hw/acpi/tpm.h | 3 +++ 3 files changed, 41 insertions(+) diff --git a/docs/specs/tpm.txt b/docs/specs/tpm.txt index 1af82bb..e4bb094 100644 --- a/docs/specs/tpm.txt +++ b/docs/specs/tpm.txt @@ -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 = diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 14f757f..9898247 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -119,6 +119,12 @@ typedef struct AcpiBuildPciBusHotplugState { bool pcihp_bridge_en; } AcpiBuildPciBusHotplugState; +typedef struct FwCfgTPMConfig { + uint32_t tpmppi_address; + uint8_t tpm_version; + uint8_t tpmppi_version; +} QEMU_PACKED FwCfgTPMConfig; + static void init_common_fadt_data(Object *o, AcpiFadtData *data) { uint32_t io = object_property_get_uint(o, ACPI_PM_PROP_PM_IO_BASE, NULL); @@ -2847,6 +2853,8 @@ void acpi_setup(void) AcpiBuildTables tables; AcpiBuildState *build_state; Object *vmgenid_dev; + TPMIf *tpm; + static FwCfgTPMConfig tpm_config; if (!pcms->fw_cfg) { ACPI_BUILD_DPRINTF("No fw cfg. Bailing out.\n"); @@ -2881,6 +2889,17 @@ void acpi_setup(void) fw_cfg_add_file(pcms->fw_cfg, ACPI_BUILD_TPMLOG_FILE, tables.tcpalog->data, acpi_data_len(tables.tcpalog)); + tpm = tpm_find(); + if (tpm && object_property_get_bool(OBJECT(tpm), "ppi", &error_abort)) { + tpm_config = (FwCfgTPMConfig) { + .tpmppi_address = cpu_to_le32(TPM_PPI_ADDR_BASE), + .tpm_version = tpm_get_version(tpm), + .tpmppi_version = TPM_PPI_VERSION_NONE + }; + fw_cfg_add_file(pcms->fw_cfg, "etc/tpm/config", + &tpm_config, sizeof tpm_config); + } + vmgenid_dev = find_vmgenid_dev(); if (vmgenid_dev) { vmgenid_add_fw_cfg(VMGENID(vmgenid_dev), pcms->fw_cfg, diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h index b8796df..a6109a9 100644 --- a/include/hw/acpi/tpm.h +++ b/include/hw/acpi/tpm.h @@ -194,4 +194,7 @@ REG32(CRB_DATA_BUFFER, 0x80) #define TPM_PPI_ADDR_SIZE 0x400 #define TPM_PPI_ADDR_BASE 0xFED45000 +#define TPM_PPI_VERSION_NONE 0 +#define TPM_PPI_VERSION_1_30 1 + #endif /* HW_ACPI_TPM_H */ -- cgit v1.1