On 9/10/18 10:32 AM, Marc-André Lureau wrote:
> From: Stefan Berger <stef...@linux.vnet.ibm.com>
>
> The TPM Physical Presence interface consists of an ACPI part, a shared
> memory part, and code in the firmware. Users can send messages to the
> firmware by writing a code into the shared memory through invoking the
> ACPI code. When a reboot happens, the firmware looks for the code and
> acts on it by sending sequences of commands to the TPM.
>
> This patch adds the ACPI code. It is similar to the one in EDK2 but doesn't
> assume that SMIs are necessary to use. It uses a similar datastructure for
> the shared memory as EDK2 does so that EDK2 and SeaBIOS could both make use
> of it. I extended the shared memory data structure with an array of 256
> bytes, one for each code that could be implemented. The array contains
> flags describing the individual codes. This decouples the ACPI implementation
> from the firmware implementation.
>
> The underlying TCG specification is accessible from the following page.
>
> https://trustedcomputinggroup.org/tcg-physical-presence-interface-specification/
>
> This patch implements version 1.30.
>
> Signed-off-by: Stefan Berger <stef...@linux.vnet.ibm.com>
> [ Marc-André - ACPI code improvements and windows fixes ]
> Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>
> Acked-by: Michael S. Tsirkin <m...@redhat.com>
> Reviewed-by: Igor Mammedov <imamm...@redhat.com>
> ---
> include/hw/acpi/tpm.h | 8 +
> hw/i386/acpi-build.c | 393 +++++++++++++++++++++++++++++++++++++++++-
The spec doesnt' look X86 specific, I'd add this code in "hw/acpi/tpm.c"
> docs/specs/tpm.txt | 83 +++++++++
> 3 files changed, 481 insertions(+), 3 deletions(-)
>
> diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h
> index a6109a97fc..ecccb96933 100644
> --- a/include/hw/acpi/tpm.h
> +++ b/include/hw/acpi/tpm.h
> @@ -197,4 +197,12 @@ REG32(CRB_DATA_BUFFER, 0x80)
> #define TPM_PPI_VERSION_NONE 0
> #define TPM_PPI_VERSION_1_30 1
>
> +/* whether function is blocked by BIOS settings; bits 0, 1, 2 */
> +#define TPM_PPI_FUNC_NOT_IMPLEMENTED (0 << 0)
> +#define TPM_PPI_FUNC_BIOS_ONLY (1 << 0)
> +#define TPM_PPI_FUNC_BLOCKED (2 << 0)
> +#define TPM_PPI_FUNC_ALLOWED_USR_REQ (3 << 0)
> +#define TPM_PPI_FUNC_ALLOWED_USR_NOT_REQ (4 << 0)
> +#define TPM_PPI_FUNC_MASK (7 << 0)
> +
> #endif /* HW_ACPI_TPM_H */
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index c24f68df02..c5e9a6e11d 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -43,6 +43,7 @@
> #include "hw/acpi/memory_hotplug.h"
> #include "sysemu/tpm.h"
> #include "hw/acpi/tpm.h"
> +#include "hw/tpm/tpm_ppi.h"
> #include "hw/acpi/vmgenid.h"
> #include "sysemu/tpm_backend.h"
> #include "hw/timer/mc146818rtc_regs.h"
> @@ -1789,6 +1790,386 @@ static Aml *build_q35_osc_method(void)
> return method;
> }
>
> +static void
> +build_tpm_ppi(TPMIf *tpm, Aml *dev)
> +{
> + Aml *method, *field, *ifctx, *ifctx2, *ifctx3, *func_mask,
> + *not_implemented, *pak, *tpm2, *tpm3, *pprm, *pprq, *zero, *one;
> +
> + if (!object_property_get_bool(OBJECT(tpm), "ppi", &error_abort)) {
> + return;
> + }
> +
> + zero = aml_int(0);
> + one = aml_int(1);
> + func_mask = aml_int(TPM_PPI_FUNC_MASK);
> + not_implemented = aml_int(TPM_PPI_FUNC_NOT_IMPLEMENTED);
> +
> + /*
> + * TPP2 is for the registers that ACPI code used to pass
> + * the PPI code and parameter (PPRQ, PPRM) to the firmware.
> + */
> + aml_append(dev,
> + aml_operation_region("TPP2", AML_SYSTEM_MEMORY,
> + aml_int(TPM_PPI_ADDR_BASE + 0x100),
> + 0x5A));
> + field = aml_field("TPP2", AML_ANY_ACC, AML_NOLOCK, AML_PRESERVE);
> + aml_append(field, aml_named_field("PPIN", 8));
> + aml_append(field, aml_named_field("PPIP", 32));
> + aml_append(field, aml_named_field("PPRP", 32));
> + aml_append(field, aml_named_field("PPRQ", 32));
> + aml_append(field, aml_named_field("PPRM", 32));
> + aml_append(field, aml_named_field("LPPR", 32));
> + aml_append(dev, field);
> + pprq = aml_name("PPRQ");
> + pprm = aml_name("PPRM");
> +
> + /*
> + * DerefOf in Windows is broken with SYSTEM_MEMORY. Use a dynamic
> + * operation region inside of a method for getting FUNC[op].
> + */
> + method = aml_method("TPFN", 1, AML_SERIALIZED);
> + {
> + Aml *op = aml_arg(0);
> + ifctx = aml_if(aml_lgreater_equal(op, aml_int(0x100)));
> + {
> + aml_append(ifctx, aml_return(zero));
> + }
> + aml_append(method, ifctx);
> +
> + aml_append(method,
> + aml_operation_region("TPP1", AML_SYSTEM_MEMORY,
> + aml_add(aml_int(TPM_PPI_ADDR_BASE), op, NULL), 0x1));
> + field = aml_field("TPP1", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
> + aml_append(field, aml_named_field("TPPF", 8));
> + aml_append(method, field);
> + aml_append(method, aml_return(aml_name("TPPF")));
> + }
> + aml_append(dev, method);
> +
> + /*
> + * Use global TPM2 & TPM3 variables to workaround Windows ACPI bug
> + * when returning packages.
> + */
> + pak = aml_package(2);
> + aml_append(pak, zero);
> + aml_append(pak, zero);
> + aml_append(dev, aml_name_decl("TPM2", pak));
> + tpm2 = aml_name("TPM2");
> +
> + pak = aml_package(3);
> + aml_append(pak, zero);
> + aml_append(pak, zero);
> + aml_append(pak, zero);
> + aml_append(dev, aml_name_decl("TPM3", pak));
> + tpm3 = aml_name("TPM3");
> +
> + method = aml_method("_DSM", 4, AML_SERIALIZED);
> + {
> + uint8_t zerobyte[1] = { 0 };
> + Aml *function, *arguments, *rev, *op, *op_arg, *op_flags, *uuid;
> +
> + uuid = aml_arg(0);
> + rev = aml_arg(1);
> + function = aml_arg(2);
> + arguments = aml_arg(3);
> + op = aml_local(0);
> + op_flags = aml_local(1);
> +
> + ifctx = aml_if(
> + aml_equal(uuid,
> + aml_touuid("3DDDFAA6-361B-4EB4-A424-8D10089D1653")));
> + {
> + /* standard DSM query function */
> + ifctx2 = aml_if(aml_equal(function, zero));
> + {
> + uint8_t byte_list[2] = { 0xff, 0x01 };
> + aml_append(ifctx2, aml_return(aml_buffer(2, byte_list)));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * PPI 1.0: 2.1.1 Get Physical Presence Interface Version
> + *
> + * Arg 2 (Integer): Function Index = 1
> + * Arg 3 (Package): Arguments = Empty Package
> + * Returns: Type: String
> + */
> + ifctx2 = aml_if(aml_equal(function, one));
> + {
> + aml_append(ifctx2, aml_return(aml_string("1.3")));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * PPI 1.0: 2.1.3 Submit TPM Operation Request to Pre-OS
> Environment
> + *
> + * Arg 2 (Integer): Function Index = 2
> + * Arg 3 (Package): Arguments = Package: Type: Integer
> + * Operation Value of the Request
> + * Returns: Type: Integer
> + * 0: Success
> + * 1: Operation Value of the Request Not Supported
> + * 2: General Failure
> + */
> + ifctx2 = aml_if(aml_equal(function, aml_int(2)));
> + {
> + /* get opcode */
> + aml_append(ifctx2,
> + aml_store(aml_derefof(aml_index(arguments,
> + zero)), op));
> +
> + /* get opcode flags */
> + aml_append(ifctx2,
> + aml_store(aml_call1("TPFN", op), op_flags));
> +
> + /* if func[opcode] & TPM_PPI_FUNC_NOT_IMPLEMENTED */
> + ifctx3 = aml_if(
> + aml_equal(
> + aml_and(op_flags, func_mask, NULL),
> + not_implemented));
> + {
> + /* 1: Operation Value of the Request Not Supported */
> + aml_append(ifctx3, aml_return(one));
> + }
> + aml_append(ifctx2, ifctx3);
> +
> + aml_append(ifctx2, aml_store(op, pprq));
> + aml_append(ifctx2, aml_store(zero, pprm));
> + /* 0: success */
> + aml_append(ifctx2, aml_return(zero));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * PPI 1.0: 2.1.4 Get Pending TPM Operation Requested By the OS
> + *
> + * Arg 2 (Integer): Function Index = 3
> + * Arg 3 (Package): Arguments = Empty Package
> + * Returns: Type: Package of Integers
> + * Integer 1: Function Return code
> + * 0: Success
> + * 1: General Failure
> + * Integer 2: Pending operation requested by the OS
> + * 0: None
> + * >0: Operation Value of the Pending Request
> + * Integer 3: Optional argument to pending operation
> + * requested by the OS
> + * 0: None
> + * >0: Argument Value of the Pending Request
> + */
> + ifctx2 = aml_if(aml_equal(function, aml_int(3)));
> + {
> + /*
> + * Revision ID of 1, no integer parameter beyond
> + * parameter two are expected
> + */
> + ifctx3 = aml_if(aml_equal(rev, one));
> + {
> + /* TPM2[1] = PPRQ */
> + aml_append(ifctx3,
> + aml_store(pprq, aml_index(tpm2, one)));
> + aml_append(ifctx3, aml_return(tpm2));
> + }
> + aml_append(ifctx2, ifctx3);
> +
> + /*
> + * A return value of {0, 23, 1} indicates that
> + * operation 23 with argument 1 is pending.
> + */
> + ifctx3 = aml_if(aml_equal(rev, aml_int(2)));
> + {
> + /* TPM3[1] = PPRQ */
> + aml_append(ifctx3,
> + aml_store(pprq, aml_index(tpm3, one)));
> + /* TPM3[2] = PPRM */
> + aml_append(ifctx3,
> + aml_store(pprm, aml_index(tpm3, aml_int(2))));
> + aml_append(ifctx3, aml_return(tpm3));
> + }
> + aml_append(ifctx2, ifctx3);
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * PPI 1.0: 2.1.5 Get Platform-Specific Action to Transition to
> + * Pre-OS Environment
> + *
> + * Arg 2 (Integer): Function Index = 4
> + * Arg 3 (Package): Arguments = Empty Package
> + * Returns: Type: Integer
> + * 0: None
> + * 1: Shutdown
> + * 2: Reboot
> + * 3: OS Vendor-specific
> + */
> + ifctx2 = aml_if(aml_equal(function, aml_int(4)));
> + {
> + /* reboot */
> + aml_append(ifctx2, aml_return(aml_int(2)));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * PPI 1.0: 2.1.6 Return TPM Operation Response to OS Environment
> + *
> + * Arg 2 (Integer): Function Index = 5
> + * Arg 3 (Package): Arguments = Empty Package
> + * Returns: Type: Package of Integer
> + * Integer 1: Function Return code
> + * 0: Success
> + * 1: General Failure
> + * Integer 2: Most recent operation request
> + * 0: None
> + * >0: Operation Value of the most recent
> request
> + * Integer 3: Response to the most recent operation
> request
> + * 0: Success
> + * 0x00000001..0x00000FFF: Corresponding TPM
> + * error code
> + * 0xFFFFFFF0: User Abort or timeout of
> dialog
> + * 0xFFFFFFF1: firmware Failure
> + */
> + ifctx2 = aml_if(aml_equal(function, aml_int(5)));
> + {
> + /* TPM3[1] = LPPR */
> + aml_append(ifctx2,
> + aml_store(aml_name("LPPR"),
> + aml_index(tpm3, one)));
> + /* TPM3[2] = PPRP */
> + aml_append(ifctx2,
> + aml_store(aml_name("PPRP"),
> + aml_index(tpm3, aml_int(2))));
> + aml_append(ifctx2, aml_return(tpm3));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * PPI 1.0: 2.1.7 Submit preferred user language
> + *
> + * Arg 2 (Integer): Function Index = 6
> + * Arg 3 (Package): Arguments = String Package
> + * Preferred language code
> + * Returns: Type: Integer
> + * Function Return Code
> + * 3: Not implemented
> + */
> + ifctx2 = aml_if(aml_equal(function, aml_int(6)));
> + {
> + /* 3 = not implemented */
> + aml_append(ifctx2, aml_return(aml_int(3)));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * PPI 1.1: 2.1.7 Submit TPM Operation Request to
> + * Pre-OS Environment 2
> + *
> + * Arg 2 (Integer): Function Index = 7
> + * Arg 3 (Package): Arguments = Package: Type: Integer
> + * Integer 1: Operation Value of the Request
> + * Integer 2: Argument for Operation (optional)
> + * Returns: Type: Integer
> + * 0: Success
> + * 1: Not Implemented
> + * 2: General Failure
> + * 3: Operation blocked by current firmware settings
> + */
> + ifctx2 = aml_if(aml_equal(function, aml_int(7)));
> + {
> + /* get opcode */
> + aml_append(ifctx2, aml_store(aml_derefof(aml_index(arguments,
> + zero)),
> + op));
> +
> + /* get opcode flags */
> + aml_append(ifctx2, aml_store(aml_call1("TPFN", op),
> + op_flags));
> + /* if func[opcode] & TPM_PPI_FUNC_NOT_IMPLEMENTED */
> + ifctx3 = aml_if(
> + aml_equal(
> + aml_and(op_flags, func_mask, NULL),
> + not_implemented));
> + {
> + /* 1: not implemented */
> + aml_append(ifctx3, aml_return(one));
> + }
> + aml_append(ifctx2, ifctx3);
> +
> + /* if func[opcode] & TPM_PPI_FUNC_BLOCKED */
> + ifctx3 = aml_if(
> + aml_equal(
> + aml_and(op_flags, func_mask, NULL),
> + aml_int(TPM_PPI_FUNC_BLOCKED)));
> + {
> + /* 3: blocked by firmware */
> + aml_append(ifctx3, aml_return(aml_int(3)));
> + }
> + aml_append(ifctx2, ifctx3);
> +
> + /* revision to integer */
> + ifctx3 = aml_if(aml_equal(rev, one));
> + {
> + /* revision 1 */
> + /* PPRQ = op */
> + aml_append(ifctx3, aml_store(op, pprq));
> + /* no argument, PPRM = 0 */
> + aml_append(ifctx3, aml_store(zero, pprm));
> + }
> + aml_append(ifctx2, ifctx3);
> +
> + ifctx3 = aml_if(aml_equal(rev, aml_int(2)));
> + {
> + /* revision 2 */
> + /* PPRQ = op */
> + op_arg = aml_derefof(aml_index(arguments, one));
> + aml_append(ifctx3, aml_store(op, pprq));
> + /* PPRM = arg3[1] */
> + aml_append(ifctx3, aml_store(op_arg, pprm));
> + }
> + aml_append(ifctx2, ifctx3);
> + /* 0: success */
> + aml_append(ifctx2, aml_return(zero));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * PPI 1.1: 2.1.8 Get User Confirmation Status for Operation
> + *
> + * Arg 2 (Integer): Function Index = 8
> + * Arg 3 (Package): Arguments = Package: Type: Integer
> + * Operation Value that may need user
> confirmation
> + * Returns: Type: Integer
> + * 0: Not implemented
> + * 1: Firmware only
> + * 2: Blocked for OS by firmware configuration
> + * 3: Allowed and physically present user required
> + * 4: Allowed and physically present user not required
> + */
> + ifctx2 = aml_if(aml_equal(function, aml_int(8)));
> + {
> + /* get opcode */
> + aml_append(ifctx2,
> + aml_store(aml_derefof(aml_index(arguments,
> + zero)),
> + op));
> +
> + /* get opcode flags */
> + aml_append(ifctx2, aml_store(aml_call1("TPFN", op),
> + op_flags));
> + /* return confirmation status code */
> + aml_append(ifctx2,
> + aml_return(
> + aml_and(op_flags, func_mask, NULL)));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + aml_append(ifctx, aml_return(aml_buffer(1, zerobyte)));
> + }
> + aml_append(method, ifctx);
> + }
> + aml_append(dev, method);
> +}
> +
> static void
> build_dsdt(GArray *table_data, BIOSLinker *linker,
> AcpiPmInfo *pm, AcpiMiscInfo *misc,
> @@ -1802,6 +2183,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> uint32_t nr_mem = machine->ram_slots;
> int root_bus_limit = 0xFF;
> PCIBus *bus = NULL;
> + TPMIf *tpm = tpm_find();
> int i;
>
> dsdt = init_aml_allocator();
> @@ -2139,7 +2521,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> /* Scan all PCI buses. Generate tables to support hotplug. */
> build_append_pci_bus_devices(scope, bus, pm->pcihp_bridge_en);
>
> - if (TPM_IS_TIS(tpm_find())) {
> + if (TPM_IS_TIS(tpm)) {
> dev = aml_device("ISA.TPM");
> aml_append(dev, aml_name_decl("_HID",
> aml_eisaid("PNP0C31")));
> aml_append(dev, aml_name_decl("_STA", aml_int(0xF)));
> @@ -2153,6 +2535,9 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> */
> /* aml_append(crs, aml_irq_no_flags(TPM_TIS_IRQ)); */
> aml_append(dev, aml_name_decl("_CRS", crs));
> +
> + build_tpm_ppi(tpm, dev);
> +
> aml_append(scope, dev);
> }
>
> @@ -2160,7 +2545,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> }
> }
>
> - if (TPM_IS_CRB(tpm_find())) {
> + if (TPM_IS_CRB(tpm)) {
> dev = aml_device("TPM");
> aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
> crs = aml_resource_template();
> @@ -2172,6 +2557,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> aml_append(method, aml_return(aml_int(0x0f)));
> aml_append(dev, method);
>
> + build_tpm_ppi(tpm, dev);
> +
> aml_append(sb_scope, dev);
> }
>
> @@ -2924,7 +3311,7 @@ void acpi_setup(void)
> tpm_config = (FWCfgTPMConfig) {
> .tpmppi_address = cpu_to_le32(TPM_PPI_ADDR_BASE),
> .tpm_version = tpm_get_version(tpm_find()),
> - .tpmppi_version = TPM_PPI_VERSION_NONE
> + .tpmppi_version = TPM_PPI_VERSION_1_30
> };
> fw_cfg_add_file(pcms->fw_cfg, "etc/tpm/config",
> &tpm_config, sizeof tpm_config);
> diff --git a/docs/specs/tpm.txt b/docs/specs/tpm.txt
> index a5bdd5f26e..332c2ae597 100644
> --- a/docs/specs/tpm.txt
> +++ b/docs/specs/tpm.txt
> @@ -62,6 +62,89 @@ URL:
>
> https://trustedcomputinggroup.org/tcg-acpi-specification/
>
> +== ACPI PPI Interface ==
> +
> +QEMU supports the Physical Presence Interface (PPI) for TPM 1.2 and TPM 2.
> This
> +interface requires ACPI and firmware support. The specification can be found
> at
> +the following URL:
> +
> +https://trustedcomputinggroup.org/resource/tcg-physical-presence-interface-specification/
> +
> +PPI enables a system administrator (root) to request a modification to the
> +TPM upon reboot. The PPI specification defines the operation requests and the
> +actions the firmware has to take. The system administrator passes the
> operation
> +request number to the firmware through an ACPI interface which writes this
> +number to a memory location that the firmware knows. Upon reboot, the
> firmware
> +finds the number and sends commands to the the TPM. The firmware writes the
> TPM
> +result code and the operation request number to a memory location that ACPI
> can
> +read from and pass the result on to the administrator.
> +
> +The PPI specification defines a set of mandatory and optional operations for
> +the firmware to implement. The ACPI interface also allows an administrator to
> +list the supported operations. In QEMU the ACPI code is generated by QEMU,
> yet
> +the firmware needs to implement support on a per-operations basis, and
> +different firmwares may support a different subset. Therefore, QEMU
> introduces
> +the virtual memory device for PPI where the firmware can indicate which
> +operations it supports and ACPI can enable the ones that are supported and
> +disable all others. This interface lies in main memory and has the following
> +layout:
> +
> + +----------+--------+--------+-------------------------------------------+
> + | Field | Length | Offset | Description |
> + +----------+--------+--------+-------------------------------------------+
> + | func | 0x100 | 0x000 | Firmware sets values for each supported |
> + | | | | operation. See defined values below. |
> + +----------+--------+--------+-------------------------------------------+
> + | ppin | 0x1 | 0x100 | SMI interrupt to use. Set by firmware. |
> + | | | | Not supported. |
> + +----------+--------+--------+-------------------------------------------+
> + | ppip | 0x4 | 0x101 | ACPI function index to pass to SMM code. |
> + | | | | Set by ACPI. Not supported. |
> + +----------+--------+--------+-------------------------------------------+
> + | pprp | 0x4 | 0x105 | Result of last executed operation. Set by |
> + | | | | firmware. See function index 5 for values.|
> + +----------+--------+--------+-------------------------------------------+
> + | pprq | 0x4 | 0x109 | Operation request number to execute. See |
> + | | | | 'Physical Presence Interface Operation |
> + | | | | Summary' tables in specs. Set by ACPI. |
> + +----------+--------+--------+-------------------------------------------+
> + | pprm | 0x4 | 0x10d | Operation request optional parameter. |
> + | | | | Values depend on operation. Set by ACPI. |
> + +----------+--------+--------+-------------------------------------------+
> + | lppr | 0x4 | 0x111 | Last executed operation request number. |
> + | | | | Copied from pprq field by firmware. |
> + +----------+--------+--------+-------------------------------------------+
> + | fret | 0x4 | 0x115 | Result code from SMM function. |
> + | | | | Not supported. |
> + +----------+--------+--------+-------------------------------------------+
> + | res1 | 0x40 | 0x119 | Reserved for future use |
> + +----------+--------+--------+-------------------------------------------+
> + | next_step| 0x1 | 0x159 | Operation to execute after reboot by |
> + | | | | firmware. Used by firmware. |
> + +----------+--------+--------+-------------------------------------------+
> +
> + The following values are supported for the 'func' field. They correspond
> + to the values used by ACPI function index 8.
> +
> + +----------+-------------------------------------------------------------+
> + | value | Description |
> + +----------+-------------------------------------------------------------+
> + | 0 | Operation is not implemented. |
> + +----------+-------------------------------------------------------------+
> + | 1 | Operation is only accessible through firmware. |
> + +----------+-------------------------------------------------------------+
> + | 2 | Operation is blocked for OS by firmware configuration. |
> + +----------+-------------------------------------------------------------+
> + | 3 | Operation is allowed and physically present user required. |
> + +----------+-------------------------------------------------------------+
> + | 4 | Operation is allowed and physically present user is not |
> + | | required. |
> + +----------+-------------------------------------------------------------+
> +
> +The location of the table is given by the fw_cfg tpmppi_address field.
> +The PPI memory region size is 0x400 (TPM_PPI_ADDR_SIZE) to leave
> +enough room for future updates.
> +
>
> QEMU files related to TPM ACPI tables:
> - hw/i386/acpi-build.c
>
