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i386/tdvf: Introduce function to parse TDVF metadata

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TDX VM needs to boot with its specialized firmware, Trusted Domain
Virtual Firmware (TDVF). QEMU needs to parse TDVF and map it in TD
guest memory prior to running the TDX VM.

A TDVF Metadata in TDVF image describes the structure of firmware.
QEMU refers to it to setup memory for TDVF. Introduce function
tdvf_parse_metadata() to parse the metadata from TDVF image and store
the info of each TDVF section.

TDX metadata is located by a TDX metadata offset block, which is a
GUID-ed structure. The data portion of the GUID structure contains
only an 4-byte field that is the offset of TDX metadata to the end
of firmware file.

Select X86_FW_OVMF when TDX is enable to leverage existing functions
to parse and search OVMF's GUID-ed structures.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Co-developed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250508150002.689633-18-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Isaku Yamahata 2025-05-08 10:59:23 -04:00 • committed by Paolo Bonzini
parent 0dd5fe5ebe
commit b65a6011d1
4 changed files with 228 additions and 0 deletions
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38
include/hw/i386/tdvf.h Normal file
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/*
* Copyright (c) 2025 Intel Corporation
* Author: Isaku Yamahata <isaku.yamahata at gmail.com>
* <isaku.yamahata at intel.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef HW_I386_TDVF_H
#define HW_I386_TDVF_H
#include "qemu/osdep.h"
#define TDVF_SECTION_TYPE_BFV 0
#define TDVF_SECTION_TYPE_CFV 1
#define TDVF_SECTION_TYPE_TD_HOB 2
#define TDVF_SECTION_TYPE_TEMP_MEM 3
#define TDVF_SECTION_ATTRIBUTES_MR_EXTEND (1U << 0)
#define TDVF_SECTION_ATTRIBUTES_PAGE_AUG (1U << 1)
typedef struct TdxFirmwareEntry {
uint32_t data_offset;
uint32_t data_len;
uint64_t address;
uint64_t size;
uint32_t type;
uint32_t attributes;
} TdxFirmwareEntry;
typedef struct TdxFirmware {
uint32_t nr_entries;
TdxFirmwareEntry *entries;
} TdxFirmware;
int tdvf_parse_metadata(TdxFirmware *fw, void *flash_ptr, int size);
#endif /* HW_I386_TDVF_H */