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Re: [Qemu-devel] [PATCH v6 4/4] acpi: build TPM Physical Presence interf
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From: |
Igor Mammedov |
|
Subject: |
Re: [Qemu-devel] [PATCH v6 4/4] acpi: build TPM Physical Presence interface |
|
Date: |
Wed, 4 Jul 2018 17:39:44 +0200 |
On Thu, 28 Jun 2018 19:26:57 +0200
Marc-André Lureau <address@hidden> wrote:
> From: Stefan Berger <address@hidden>
>
> 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 <address@hidden>
> [ Marc-André - ACPI code improvements and windows fixes ]
> Signed-off-by: Marc-André Lureau <address@hidden>
>
> ---
>
> v7: (Marc-André)
> - use first spec version/section in code comments
> - use more variables for ASL code building
> - remove unnecessering ToInteger() calls
>
> v6:
> - more code documentation (Marc-André)
> - use some explicit named variables to ease reading (Marc-André)
> - use fixed size fields/memory regions, remove PPI struct (Marc-André)
> - only add PPI ACPI methods if PPI is enabled (Marc-André)
> - document the qemu/firmware ACPI memory region (Stefan)
>
> v5 (Marc-André):
> - /struct tpm_ppi/struct TPMPPIData
>
> v4 (Marc-André):
> - replace 'DerefOf (FUNC [N])' with a function, to fix Windows ACPI
> handling.
> - replace 'return Package (..) {} ' with scoped variables, to fix
> Windows ACPI handling.
>
> v3:
> - add support for PPI to CRB
> - split up OperationRegion TPPI into two parts, one containing
> the registers (TPP1) and the other one the flags (TPP2); switched
> the order of the flags versus registers in the code
> - adapted ACPI code to small changes to the array of flags where
> previous flag 0 was removed and now shifting right wasn't always
> necessary anymore
>
> v2:
> - get rid of FAIL variable; function 5 was using it and always
> returns 0; the value is related to the ACPI function call not
> a possible failure of the TPM function call.
> - extend shared memory data structure with per-opcode entries
> holding flags and use those flags to determine what to return
> to caller
> - implement interface version 1.3
> ---
> include/hw/acpi/tpm.h | 8 +
> hw/i386/acpi-build.c | 403 +++++++++++++++++++++++++++++++++++++++++-
> docs/specs/tpm.txt | 79 +++++++++
> 3 files changed, 487 insertions(+), 3 deletions(-)
>
> diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h
> index f79d68a77a..e0bd07862e 100644
> --- a/include/hw/acpi/tpm.h
> +++ b/include/hw/acpi/tpm.h
> @@ -196,4 +196,12 @@ 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 ebd64c4818..263677f3e4 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 +1790,396 @@ static Aml *build_q35_osc_method(void)
> return method;
> }
>
> +static void
> +build_tpm_ppi(TPMIf *tpm, Aml *dev)
> +{
> + Aml *method, *field, *ifctx, *ifctx2, *ifctx3;
> + Aml *pak, *tpm2, *tpm3, *pprm, *pprq;
> + int i;
> +
> + if (!object_property_get_bool(OBJECT(tpm), "ppi", &error_abort)) {
> + return;
> + }
I'd prefer this being checked by caller, like:
@@ -2194,6 +2194,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
int root_bus_limit = 0xFF;
PCIBus *bus = NULL;
TPMIf *tpm = tpm_find();
+ bool has_ppi = object_property_get_bool(OBJECT(tpm), "ppi", &error_abort);
int i;
dsdt = init_aml_allocator();
@@ -2545,8 +2546,9 @@ 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);
+ if (has_ppi) {
+ build_tpm_ppi(tpm, dev);
+ }
aml_append(scope, dev);
}
@@ -2567,7 +2569,9 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
aml_append(method, aml_return(aml_int(0x0f)));
aml_append(dev, method);
- build_tpm_ppi(tpm, dev);
+ if (has_ppi) {
+ build_tpm_ppi(tpm, dev);
+ }
aml_append(sb_scope, dev);
}
> + /*
> + * TPP1 is for the flags that indicate which PPI operations
> + * are supported by the firmware. The firmware is expected to
> + * write these flags.
> + */
> + aml_append(dev,
> + aml_operation_region("TPP1", AML_SYSTEM_MEMORY,
> + aml_int(TPM_PPI_ADDR_BASE), 0x100));
> + field = aml_field("TPP1", AML_ANY_ACC, AML_NOLOCK, AML_PRESERVE);
> + for (i = 0; i < 0x100; i++) {
> + char *tmp = g_strdup_printf("FN%02X", i);
> + aml_append(field, aml_named_field(tmp, 8));
> + g_free(tmp);
> + }
this and TPFN takes more than 4K.
Have you tried to declare only one filed of size TPP1, which makes
field Buffer type, which could be used with Index and would take only
several bytes to in AML. See ACPI 6.2a 19.6.61.2 Index with Buffers.
It also looks very portable (but we should test with win xp just to be safe)
> + aml_append(dev, field);
> +
> + /*
> + * 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");
> +
> + /*
> + * A function to return the value of DerefOf (FUNC [N]), by using
> + * accessing the fields individually instead. This is a workaround
> + * for what looks like a Windows ACPI bug in all versions so far
> + * (fwiw, DerefOf (FUNC [N]) works on Linux).
> + */
> + method = aml_method("TPFN", 1, AML_SERIALIZED);
> + {
> + for (i = 0; i < 0x100; i++) {
> + ifctx = aml_if(aml_equal(aml_int(i), aml_arg(0)));
> + {
> + aml_append(ifctx, aml_return(aml_name("FN%02X", i)));
> + }
> + aml_append(method, ifctx);
> + }
> + aml_append(method, aml_return(aml_int(0)));
> + }
> + aml_append(dev, method);
> +
> + pak = aml_package(2);
> + aml_append(pak, aml_int(0));
> + aml_append(pak, aml_int(0));
> + aml_append(dev, aml_name_decl("TPM2", pak));
> + tpm2 = aml_name("TPM2");
> +
> + pak = aml_package(3);
> + aml_append(pak, aml_int(0));
> + aml_append(pak, aml_int(0));
> + aml_append(pak, aml_int(0));
> + aml_append(dev, aml_name_decl("TPM3", pak));
> + tpm3 = aml_name("TPM3");
looks like above 2 packages are used only by _DSM,
so you don't need to make them global, just use local variables within _DSM for
it
> +
> + 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);
> + ifctx = aml_if(
> + aml_equal(uuid,
> + aml_touuid("3DDDFAA6-361B-4EB4-A424-8D10089D1653")));
> + {
it would be better to exit immediately if UUID doesn't match (less indentation
and if contexts)
btw, one should return something if uuid doesn't match method,
if (LNotEqual(uuid, ToUUID(“893f00a6-660c-494e-bcfd-3043f4fb67c0”))) {
return(Buffer(){0})
}
> + /* standard DSM query function */
> + ifctx2 = aml_if(aml_equal(function, aml_int(0)));
constants aml_int(0..3) are used multiple times, suggest to declare them
along with rev/function/..., like:
Aml *one = aml_int(0);
...
and then use them through code.
> + {
> + 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, aml_int(1)));
> + {
> + 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 */
> + arguments = aml_arg(3);
> + op = aml_local(0);
> + op_flags = aml_local(1);
suggest to move these 3 close to function/rev/... as they are repeated several
times
with the same meaning in several if contexts.
> + aml_append(ifctx2,
> + aml_store(aml_derefof(aml_index(arguments,
> + aml_int(0))),
> 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, aml_int(TPM_PPI_FUNC_MASK), NULL),
> + aml_int(TPM_PPI_FUNC_NOT_IMPLEMENTED)));
same as for aml_int(0) TPM_PPI_FUNC_MASK/TPM_PPI_FUNC_NOT_IMPLEMENTED and other
TPM_PPI_*
constants that are user as aml_int(), it might mkae code more readable with
shorter lines and shorter variable names.
> + {
> + /* 1: Operation Value of the Request Not Supported */
> + aml_append(ifctx3, aml_return(aml_int(1)));
> + }
> + aml_append(ifctx2, ifctx3);
> +
> + aml_append(ifctx2, aml_store(op, pprq));
> + aml_append(ifctx2, aml_store(aml_int(0), pprm));
> + /* 0: success */
> + aml_append(ifctx2, aml_return(aml_int(0)));
> + }
> + 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, aml_int(1)));
> + {
> + /* TPM2[1] = PPRQ */
> + aml_append(ifctx3,
> + aml_store(pprq, aml_index(tpm2, aml_int(1))));
> + 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, aml_int(1))));
> + /* 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, aml_int(1))));
> + /* 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 */
> + arguments = aml_arg(3);
> + op = aml_local(0);
> + op_flags = aml_local(1);
> + aml_append(ifctx2, aml_store(aml_derefof(aml_index(arguments,
> +
> aml_int(0))),
> + 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, aml_int(TPM_PPI_FUNC_MASK), NULL),
> + aml_int(TPM_PPI_FUNC_NOT_IMPLEMENTED)));
> + {
> + /* 1: not implemented */
> + aml_append(ifctx3, aml_return(aml_int(1)));
> + }
> + aml_append(ifctx2, ifctx3);
> +
> + /* if func[opcode] & TPM_PPI_FUNC_BLOCKED */
> + ifctx3 = aml_if(
> + aml_equal(
> + aml_and(op_flags, aml_int(TPM_PPI_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, aml_int(1)));
> + {
> + /* revision 1 */
> + /* PPRQ = op */
> + aml_append(ifctx3, aml_store(op, pprq));
> + /* no argument, PPRM = 0 */
> + aml_append(ifctx3, aml_store(aml_int(0), pprm));
> + }
> + aml_append(ifctx2, ifctx3);
> +
> + ifctx3 = aml_if(aml_equal(rev, aml_int(2)));
> + {
> + /* revision 2 */
> + /* PPRQ = op */
> + arguments = aml_arg(3);
> + op_arg = aml_derefof(aml_index(arguments, aml_int(1)));
> + 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(aml_int(0)));
> + }
> + aml_append(ifctx, ifctx2);
> +
> + /*
> + * 8.1.8 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 */
> + arguments = aml_arg(3);
> + op = aml_local(0);
> + op_flags = aml_local(1);
> + aml_append(ifctx2,
> + aml_store(aml_derefof(aml_index(arguments,
> + aml_int(0))),
> + 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,
> + aml_int(TPM_PPI_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 +2193,7 @@ 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 +2531,7 @@ 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 +2545,9 @@ 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 +2555,7 @@ 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 +2567,8 @@ 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);
> }
>
> @@ -2920,7 +3317,7 @@ 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 2ddb768084..c27762c723 100644
> --- a/docs/specs/tpm.txt
> +++ b/docs/specs/tpm.txt
> @@ -62,6 +62,85 @@ 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. |
> + +----------+-------------------------------------------------------------+
> +
>
> QEMU files related to TPM ACPI tables:
> - hw/i386/acpi-build.c
- Re: [Qemu-devel] [PATCH v6 4/4] acpi: build TPM Physical Presence interface,
Igor Mammedov <=