Re: [RFC PATCH v3 23/26] hw/tpm: Add TPM event log

[Philippe Mathieu-Daudé]

On 25/11/24 20:56, Jean-Philippe Brucker wrote:
> Provide a library allowing the VMM to create an event log that describes
> what is loaded into memory. During remote attestation in confidential
> computing this helps an independent verifier reconstruct the initial
> measurements of a VM, which contain the initial state of memory and
> CPUs.
>
> We provide some definitions and structures described by the Trusted
> Computing Group (TCG) in "TCG PC Client Platform Firmware Profile
> Specification" Level 00 Version 1.06 Revision 52 [1]. This is the same
> format used by UEFI, and UEFI could reuse this log after finding it in
> DT or ACPI tables, but can also copy its content into a new one.
>
> [1] 
> https://trustedcomputinggroup.org/resource/pc-client-specific-platform-firmware-profile-specification/
>
> Cc: Stefan Berger <stefanb@linux.vnet.ibm.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
> ---
> v2->v3: New
> ---
>   qapi/tpm.json            |  14 ++
>   include/hw/tpm/tpm_log.h |  89 +++++++++++
>   hw/tpm/tpm_log.c         | 325 +++++++++++++++++++++++++++++++++++++++
>   hw/tpm/Kconfig           |   4 +
>   hw/tpm/meson.build       |   1 +
>   5 files changed, 433 insertions(+)
>   create mode 100644 include/hw/tpm/tpm_log.h
>   create mode 100644 hw/tpm/tpm_log.c


> +/*
> + * Defined in: TCG PC Client Platform Firmware Profile Specification
> + * Version 1.06 revision 52
> + */
> +#define TCG_EV_NO_ACTION                        0x00000003
> +#define TCG_EV_EVENT_TAG                        0x00000006
> +#define TCG_EV_POST_CODE2                       0x00000013
> +#define TCG_EV_EFI_PLATFORM_FIRMWARE_BLOB2      0x8000000A
> +
> +struct UefiPlatformFirmwareBlob2Head {
> +        uint8_t blob_description_size;
> +        uint8_t blob_description[];
> +} __attribute__((packed));

We use QEMU_PACKED.