From: Marc-André Lureau <marcandre.lur...@redhat.com> The interface is described in the "TCG Platform Reset Attack Mitigation Specification", chapter 6 "ACPI _DSM Function". According to Laszlo, it's not so easy to implement in OVMF, he suggested to do it in qemu instead.
See specification documentation for more details, and next commit for memory clear on reset handling. The underlying TCG specification is accessible from the following page. https://trustedcomputinggroup.org/resource/pc-client-work-group-platform-reset-attack-mitigation-specification-version-1-0/ This patch implements version 1.0. Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com> Reviewed-by: Michael S. Tsirkin <m...@redhat.com> Reviewed-by: Igor Mammedov <imamm...@redhat.com> Tested-by: Stefan Berger <stef...@linux.ibm.com> Reviewed-by: Michael S. Tsirkin <m...@redhat.com> Signed-off-by: Michael S. Tsirkin <m...@redhat.com> --- docs/specs/tpm.txt | 2 ++ hw/acpi/tpm.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/docs/specs/tpm.txt b/docs/specs/tpm.txt index 424d1511fc..5d8c26b1ad 100644 --- a/docs/specs/tpm.txt +++ b/docs/specs/tpm.txt @@ -135,6 +135,8 @@ layout: +----------+--------+--------+-------------------------------------------+ | next_step| 0x1 | 0x159 | Operation to execute after reboot by | | | | | firmware. Used by firmware. | + +----------+--------+--------+-------------------------------------------+ + | movv | 0x1 | 0x15a | Memory overwrite variable | +----------+--------+--------+-------------------------------------------+ The following values are supported for the 'func' field. They correspond diff --git a/hw/acpi/tpm.c b/hw/acpi/tpm.c index 9f205378f2..b96459e45b 100644 --- a/hw/acpi/tpm.c +++ b/hw/acpi/tpm.c @@ -53,6 +53,16 @@ void tpm_build_ppi_acpi(TPMIf *tpm, Aml *dev) pprq = aml_name("PPRQ"); pprm = aml_name("PPRM"); + aml_append(dev, + aml_operation_region( + "TPP3", AML_SYSTEM_MEMORY, + aml_int(TPM_PPI_ADDR_BASE + + 0x15a /* movv, docs/specs/tpm.txt */), + 0x1)); + field = aml_field("TPP3", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE); + aml_append(field, aml_named_field("MOVV", 8)); + aml_append(dev, field); + /* * DerefOf in Windows is broken with SYSTEM_MEMORY. Use a dynamic * operation region inside of a method for getting FUNC[op]. @@ -399,6 +409,51 @@ void tpm_build_ppi_acpi(TPMIf *tpm, Aml *dev) aml_append(ifctx, aml_return(aml_buffer(1, zerobyte))); } aml_append(method, ifctx); + + /* + * "TCG Platform Reset Attack Mitigation Specification 1.00", + * Chapter 6 "ACPI _DSM Function" + */ + ifctx = aml_if( + aml_equal(uuid, + aml_touuid("376054ED-CC13-4675-901C-4756D7F2D45D"))); + { + /* standard DSM query function */ + ifctx2 = aml_if(aml_equal(function, zero)); + { + uint8_t byte_list[1] = { 0x03 }; /* functions 1-2 supported */ + + aml_append(ifctx2, + aml_return(aml_buffer(sizeof(byte_list), + byte_list))); + } + aml_append(ifctx, ifctx2); + + /* + * TCG Platform Reset Attack Mitigation Specification 1.0 Ch.6 + * + * Arg 2 (Integer): Function Index = 1 + * Arg 3 (Package): Arguments = Package: Type: Integer + * Operation Value of the Request + * Returns: Type: Integer + * 0: Success + * 1: General Failure + */ + ifctx2 = aml_if(aml_equal(function, one)); + { + aml_append(ifctx2, + aml_store(aml_derefof(aml_index(arguments, zero)), + op)); + { + aml_append(ifctx2, aml_store(op, aml_name("MOVV"))); + + /* 0: success */ + aml_append(ifctx2, aml_return(zero)); + } + } + aml_append(ifctx, ifctx2); + } + aml_append(method, ifctx); } aml_append(dev, method); } -- MST
