On Tue, Apr 01, 2025 at 09:01:27AM -0400, Xiaoyao Li wrote:
> From: Isaku Yamahata <[email protected]>
>
> 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 <[email protected]>
> Co-developed-by: Xiaoyao Li <[email protected]>
> Signed-off-by: Xiaoyao Li <[email protected]>
> Acked-by: Gerd Hoffmann <[email protected]>
> ---
> Changes in v8:
> - Drop the failure handling of memcpy() since it cannot fail;
>
> Changes in v7:
> - Update license info to only use SPDX tag;
> - use g_autofree to avoid manually free;
>
> Changes in v6:
> - Drop the the data endianness change for metadata->Length;
>
> Changes in v1:
> - rename tdvf_parse_section_entry() to
> tdvf_parse_and_check_section_entry()
>
> Changes in RFC v4:
> - rename TDX_METADATA_GUID to TDX_METADATA_OFFSET_GUID
> ---
> hw/i386/Kconfig | 1 +
> hw/i386/meson.build | 1 +
> hw/i386/tdvf.c | 183 +++++++++++++++++++++++++++++++++++++++++
> include/hw/i386/tdvf.h | 38 +++++++++
> 4 files changed, 223 insertions(+)
> create mode 100644 hw/i386/tdvf.c
> create mode 100644 include/hw/i386/tdvf.h
>
> diff --git a/hw/i386/Kconfig b/hw/i386/Kconfig
> index cce9521ba934..eb65bda6e071 100644
> --- a/hw/i386/Kconfig
> +++ b/hw/i386/Kconfig
> @@ -12,6 +12,7 @@ config SGX
>
> config TDX
> bool
> + select X86_FW_OVMF
> depends on KVM
>
> config PC
> diff --git a/hw/i386/meson.build b/hw/i386/meson.build
> index 10bdfde27c69..3bc1da2b6eb4 100644
> --- a/hw/i386/meson.build
> +++ b/hw/i386/meson.build
> @@ -32,6 +32,7 @@ i386_ss.add(when: 'CONFIG_PC', if_true: files(
> 'port92.c'))
> i386_ss.add(when: 'CONFIG_X86_FW_OVMF', if_true: files('pc_sysfw_ovmf.c'),
> if_false:
> files('pc_sysfw_ovmf-stubs.c'))
> +i386_ss.add(when: 'CONFIG_TDX', if_true: files('tdvf.c'))
>
> subdir('kvm')
> subdir('xen')
> diff --git a/hw/i386/tdvf.c b/hw/i386/tdvf.c
> new file mode 100644
> index 000000000000..328d1b7ffdf8
> --- /dev/null
> +++ b/hw/i386/tdvf.c
> @@ -0,0 +1,183 @@
> +/*
> + * Copyright (c) 2025 Intel Corporation
> + * Author: Isaku Yamahata <isaku.yamahata at gmail.com>
> + * <isaku.yamahata at intel.com>
> + * Xiaoyao Li <[email protected]>
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/error-report.h"
> +
> +#include "hw/i386/pc.h"
> +#include "hw/i386/tdvf.h"
> +#include "system/kvm.h"
> +
> +#define TDX_METADATA_OFFSET_GUID "e47a6535-984a-4798-865e-4685a7bf8ec2"
> +#define TDX_METADATA_VERSION 1
> +#define TDVF_SIGNATURE 0x46564454 /* TDVF as little endian */
> +
> +typedef struct {
> + uint32_t DataOffset;
> + uint32_t RawDataSize;
> + uint64_t MemoryAddress;
> + uint64_t MemoryDataSize;
> + uint32_t Type;
> + uint32_t Attributes;
> +} TdvfSectionEntry;
> +
> +typedef struct {
> + uint32_t Signature;
> + uint32_t Length;
> + uint32_t Version;
> + uint32_t NumberOfSectionEntries;
> + TdvfSectionEntry SectionEntries[];
> +} TdvfMetadata;
struct field names starting with an initial capital is
not the usual QEMU code style. Can this be all initial
lowercase, with capital just for word separation.
> +
> +struct tdx_metadata_offset {
> + uint32_t offset;
> +};
> +
With regards,
Daniel
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