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Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interf
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From: |
Igor Mammedov |
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Subject: |
Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface |
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Date: |
Fri, 22 Jun 2018 11:03:12 +0200 |
On Thu, 21 Jun 2018 16:11:16 -0400
Stefan Berger <address@hidden> wrote:
> On 06/21/2018 07:55 AM, Marc-André Lureau 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>
> >
> > ---
> >
> > 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 | 21 +++
> > hw/i386/acpi-build.c | 294 +++++++++++++++++++++++++++++++++++++++++-
> > 2 files changed, 314 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h
> > index f79d68a77a..430605a8e5 100644
> > --- a/include/hw/acpi/tpm.h
> > +++ b/include/hw/acpi/tpm.h
> > @@ -196,4 +196,25 @@ REG32(CRB_DATA_BUFFER, 0x80)
> > #define TPM_PPI_VERSION_NONE 0
> > #define TPM_PPI_VERSION_1_30 1
> >
> > +struct TPMPPIData {
> > + uint8_t func[256]; /* 0x000: per TPM function implementation
> > flags;
> > + set by BIOS */
> > +/* 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)
> > + uint8_t ppin; /* 0x100 : set by BIOS */
> > + uint32_t ppip; /* 0x101 : set by ACPI; not used */
> > + uint32_t pprp; /* 0x105 : response from TPM; set by BIOS */
> > + uint32_t pprq; /* 0x109 : opcode; set by ACPI */
> > + uint32_t pprm; /* 0x10d : parameter for opcode; set by ACPI
> > */
> > + uint32_t lppr; /* 0x111 : last opcode; set by BIOS */
> > + uint32_t fret; /* 0x115 : set by ACPI; not used */
> > + uint8_t res1[0x40]; /* 0x119 : reserved for future use */
> > + uint8_t next_step; /* 0x159 : next step after reboot; set by
> > BIOS */
> > +} QEMU_PACKED;
> > +
> > #endif /* HW_ACPI_TPM_H */
>
> Here's a description of this interface. The SMM related fields, ppin,
> ppip and fret could be
> renamed to reserved fields since we are not supporting SMM.
>
> diff --git a/docs/specs/tpm.txt b/docs/specs/tpm.txt
> index c230c4c93e..17d811f633 100644
> --- a/docs/specs/tpm.txt
> +++ b/docs/specs/tpm.txt
> @@ -42,6 +42,73 @@ 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:
I'd prefer a table format to describe layout, like in
docs/specs/acpi_nvdimm.txt or docs/specs/acpi_mem_hotplug.txt
> +
> + struct TPMPPIData {
> + uint8_t func[256]; /* 0x000 */
> + /* 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)
> + uint8_t ppin; /* 0x100 */
> + uint32_t ppip; /* 0x101 */
> + uint32_t pprp; /* 0x105 */
> + uint32_t pprq; /* 0x109 */
> + uint32_t pprm; /* 0x10d */
> + uint32_t lppr; /* 0x111 */
> + uint32_t fret; /* 0x115 */
> + uint8_t res1[0x40]; /* 0x119 */
> + uint8_t next_step; /* 0x159 */
> + } QEMU_PACKED;
> +
> +For each code the firmware suppports, the firmware needs to set the
> appropriate
> +flags in the func array. The number of the operation serves as the
> index for the
> +array.
> +
> +The operation request's number is written into the pprq field. Any optional
> +additional parameters needed by an operation request must be written into
> +the pprm field.
> +
> +The firmware indicates the last executed command in the lppr field and
> +writes the result into the pprp field.
> +
> +For SMM support, the field ppin describes the software SMI interrupt to
> use.
> +This field needs to be written by the firmware. The ppip field is used
> +to pass the ACPI function number to the SMM code. This field needs to be
> +written by ACPI. The fret field holds the result of the SMM operation and
> +needs to be set by SMM code.
> +
> +Some operations require the firmware to reboot the machine before it can
> +send more commands to the TPM. For this, the firmware can use the next_step
> +field to remember what operation to execute after the reboot.
>
> QEMU files related to TPM ACPI tables:
> - hw/i386/acpi-build.c
>
>
> > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > index d9320845ed..4cb3ac9000 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 +1790,292 @@ static Aml *build_q35_osc_method(void)
> > return method;
> > }
> >
> > +static void
> > +build_tpm_ppi(Aml *dev)
> > +{
> > + Aml *method, *name, *field, *ifctx, *ifctx2, *ifctx3, *pak;
> > + struct TPMPPIData *tpm_ppi = NULL;
> > + int i;
> > +
> > + /*
> > + * 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),
> > + sizeof(tpm_ppi->func)));
> > + field = aml_field("TPP1", AML_ANY_ACC, AML_NOLOCK, AML_PRESERVE);
> > + for (i = 0; i < sizeof(tpm_ppi->func); i++) {
> > + char *tmp = g_strdup_printf("FN%02X", i);
> > + aml_append(field, aml_named_field(tmp, BITS_PER_BYTE));
> > + g_free(tmp);
> > + }
> > + 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 +
> > + offsetof(struct TPMPPIData,
> > ppin)),
> > + sizeof(struct TPMPPIData) -
> > + sizeof(tpm_ppi->func)));
> > + field = aml_field("TPP2", AML_ANY_ACC, AML_NOLOCK, AML_PRESERVE);
> > + aml_append(field, aml_named_field("PPIN",
> > + sizeof(uint8_t) * BITS_PER_BYTE));
> > + aml_append(field, aml_named_field("PPIP",
> > + sizeof(uint32_t) * BITS_PER_BYTE));
> > + aml_append(field, aml_named_field("PPRP",
> > + sizeof(uint32_t) * BITS_PER_BYTE));
> > + aml_append(field, aml_named_field("PPRQ",
> > + sizeof(uint32_t) * BITS_PER_BYTE));
> > + aml_append(field, aml_named_field("PPRM",
> > + sizeof(uint32_t) * BITS_PER_BYTE));
> > + aml_append(field, aml_named_field("LPPR",
> > + sizeof(uint32_t) * BITS_PER_BYTE));
> > + aml_append(dev, field);
> > +
> > + method = aml_method("TPFN", 1, AML_SERIALIZED);
> > + {
> > + for (i = 0; i < sizeof(tpm_ppi->func); 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));
> > + name = aml_name_decl("TPM2", pak);
> > + aml_append(dev, name);
> > +
> > + pak = aml_package(3);
> > + aml_append(pak, aml_int(0));
> > + aml_append(pak, aml_int(0));
> > + aml_append(pak, aml_int(0));
> > + name = aml_name_decl("TPM3", pak);
> > + aml_append(dev, name);
> > +
> > + method = aml_method("_DSM", 4, AML_SERIALIZED);
> > + {
> > + uint8_t zerobyte[1] = { 0 };
> > +
> > + ifctx = aml_if(
> > + aml_equal(aml_arg(0),
> > + aml_touuid("3DDDFAA6-361B-4EB4-A424-8D10089D1653")));
> > + {
> > + aml_append(ifctx,
> > + aml_store(aml_to_integer(aml_arg(2)),
> > aml_local(0)));
> > +
> > + /* standard DSM query function */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(0)));
> > + {
> > + uint8_t byte_list[2] = { 0xff, 0x01 };
> > + aml_append(ifctx2, aml_return(aml_buffer(2, byte_list)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /* interface version: 1.3 */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(1)));
> > + {
> > + aml_append(ifctx2, aml_return(aml_string("1.3")));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /* submit TPM operation */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(2)));
> > + {
> > + /* get opcode */
> > + aml_append(ifctx2,
> > + aml_store(aml_derefof(aml_index(aml_arg(3),
> > + aml_int(0))),
> > + aml_local(0)));
> > + /* get opcode flags */
> > + aml_append(ifctx2,
> > + aml_store(aml_call1("TPFN", aml_local(0)),
> > + aml_local(1)));
> > + ifctx3 = aml_if(
> > + aml_equal(
> > + aml_and(aml_local(1), 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);
> > + aml_append(ifctx2, aml_store(aml_local(0),
> > aml_name("PPRQ")));
> > + aml_append(ifctx2, aml_store(aml_int(0),
> > aml_name("PPRM")));
> > + /* 0: success */
> > + aml_append(ifctx2, aml_return(aml_int(0)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /* get pending TPM operation */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(3)));
> > + {
> > + /* revision to integer */
> > + aml_append(ifctx2,
> > + aml_store(
> > + aml_to_integer(aml_arg(1)),
> > + aml_local(1)));
> > + ifctx3 = aml_if(aml_equal(aml_local(1), aml_int(1)));
> > + {
> > + aml_append(ifctx3,
> > + aml_store(
> > + aml_name("PPRQ"),
> > + aml_index(aml_name("TPM2"),
> > aml_int(1))));
> > + aml_append(ifctx3, aml_return(aml_name("TPM2")));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > +
> > + ifctx3 = aml_if(aml_equal(aml_local(1), aml_int(2)));
> > + {
> > + aml_append(ifctx3,
> > + aml_store(
> > + aml_name("PPRQ"),
> > + aml_index(aml_name("TPM3"),
> > aml_int(1))));
> > + aml_append(ifctx3,
> > + aml_store(
> > + aml_name("PPRM"),
> > + aml_index(aml_name("TPM3"),
> > aml_int(2))));
> > + aml_append(ifctx3, aml_return(aml_name("TPM3")));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /* get platform-specific action to transition to pre-OS env. */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(4)));
> > + {
> > + /* reboot */
> > + aml_append(ifctx2, aml_return(aml_int(2)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /* get TPM operation response */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(5)));
> > + {
> > + aml_append(ifctx2,
> > + aml_store(
> > + aml_name("LPPR"),
> > + aml_index(aml_name("TPM3"), aml_int(1))));
> > + aml_append(ifctx2,
> > + aml_store(
> > + aml_name("PPRP"),
> > + aml_index(aml_name("TPM3"), aml_int(2))));
> > + aml_append(ifctx2, aml_return(aml_name("TPM3")));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /* submit preferred user language */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(6)));
> > + {
> > + /* 3 = not implemented */
> > + aml_append(ifctx2, aml_return(aml_int(3)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /* submit TPM operation v2 */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(7)));
> > + {
> > + /* get opcode */
> > + aml_append(ifctx2,
> > + aml_store(aml_derefof(aml_index(aml_arg(3),
> > + aml_int(0))),
> > + aml_local(0)));
> > + /* get opcode flags */
> > + aml_append(ifctx2,
> > + aml_store(aml_call1("TPFN", aml_local(0)),
> > + aml_local(1)));
> > + ifctx3 = aml_if(
> > + aml_equal(
> > + aml_and(aml_local(1), 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);
> > +
> > + ifctx3 = aml_if(
> > + aml_equal(
> > + aml_and(aml_local(1), 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 */
> > + aml_append(ifctx2,
> > + aml_store(
> > + aml_to_integer(aml_arg(1)),
> > + aml_local(1)));
> > +
> > + ifctx3 = aml_if(aml_equal(aml_local(1), aml_int(1)));
> > + {
> > + /* revision 1 */
> > + aml_append(ifctx3, aml_store(aml_local(0),
> > + aml_name("PPRQ")));
> > + aml_append(ifctx3, aml_store(aml_int(0),
> > + aml_name("PPRM")));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > +
> > + ifctx3 = aml_if(aml_equal(aml_local(1), aml_int(2)));
> > + {
> > + /* revision 2 */
> > + aml_append(ifctx3,
> > + aml_store(aml_local(0), aml_name("PPRQ")));
> > + aml_append(ifctx3,
> > + aml_store(
> > + aml_derefof(aml_index(aml_arg(3),
> > + aml_int(1))),
> > + aml_name("PPRM")));
> > + }
> > + aml_append(ifctx2, ifctx3);
> > + /* 0: success */
> > + aml_append(ifctx2, aml_return(aml_int(0)));
> > + }
> > + aml_append(ifctx, ifctx2);
> > +
> > + /* get user confirmation status for operation */
> > + ifctx2 = aml_if(aml_equal(aml_local(0), aml_int(8)));
> > + {
> > + /* get opcode */
> > + aml_append(ifctx2,
> > + aml_store(aml_derefof(aml_index(aml_arg(3),
> > + aml_int(0))),
> > + aml_local(0)));
> > + /* get opcode flags */
> > + aml_append(ifctx2,
> > + aml_store(aml_call1("TPFN", aml_local(0)),
> > + aml_local(1)));
> > + /* return confirmation status code */
> > + aml_append(ifctx2,
> > + aml_return(
> > + aml_and(aml_local(1),
> > + 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,
> > @@ -2153,6 +2440,9 @@ 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(dev);
> > +
> > aml_append(scope, dev);
> > }
> >
> > @@ -2172,6 +2462,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> > aml_append(method, aml_return(aml_int(0x0f)));
> > aml_append(dev, method);
> >
> > + build_tpm_ppi(dev);
> > +
> > aml_append(sb_scope, dev);
> > }
> >
> > @@ -2920,7 +3212,7 @@ void acpi_setup(void)
> > tpm_config = (FWCfgTPMConfig) {
> > .tpmppi_address = cpu_to_le32(TPM_PPI_ADDR_BASE),
> > .tpm_version = cpu_to_le32(tpm_get_version(tpm_find())),
> > - .tpmppi_version = cpu_to_le32(TPM_PPI_VERSION_NONE)
> > + .tpmppi_version = cpu_to_le32(TPM_PPI_VERSION_1_30)
> > };
> > fw_cfg_add_file(pcms->fw_cfg, "etc/tpm/config",
> > &tpm_config, sizeof tpm_config);
>
>
>
- [Qemu-devel] [PATCH v4 0/5] Add support for TPM Physical Presence interface, Marc-André Lureau, 2018/06/21
- [Qemu-devel] [PATCH v4 2/5] tpm: implement virtual memory device for TPM PPI, Marc-André Lureau, 2018/06/21
- [Qemu-devel] [PATCH v4 1/5] tpm: add a "ppi" boolean property, Marc-André Lureau, 2018/06/21
- [Qemu-devel] [PATCH v4 3/5] acpi: add fw_cfg file for TPM and PPI virtual memory device, Marc-André Lureau, 2018/06/21
- [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface, Marc-André Lureau, 2018/06/21
- Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface, Stefan Berger, 2018/06/21
- Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface,
Igor Mammedov <=
- Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface, Stefan Berger, 2018/06/22
- Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface, Igor Mammedov, 2018/06/22
- Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface, Stefan Berger, 2018/06/22
- Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface, Igor Mammedov, 2018/06/25
- Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface, Stefan Berger, 2018/06/25
- Re: [Qemu-devel] [PATCH v4 4/5] acpi: build TPM Physical Presence interface, Stefan Berger, 2018/06/25
[Qemu-devel] [PATCH v4 5/5] tpm: add a fake ACPI memory clear interface, Marc-André Lureau, 2018/06/21