Re: [PATCH v2 11/14] x86/sev: Extend the config-fs attestation support for an SVSM

["Kuppuswamy, Sathyanarayanan" <sathyanarayanan.kuppuswamy@intel.com>]

On 3/8/24 10:35 AM, Tom Lendacky wrote:
> When an SVSM is present, the guest can also request attestation reports
> from the SVSM. These SVSM attestation reports can be used to attest the
> SVSM and any services running within the SVSM.
>
> Extend the config-fs attestation support to allow for an SVSM attestation
> report. This involves creating four (4) new config-fs attributes:
>
>   - 'svsm' (input)
>     This attribute is used to determine whether the attestation request
>     should be sent to the SVSM or to the SEV firmware.
>
>   - 'service_guid' (input)
>     Used for requesting the attestation of a single service within the
>     SVSM. A null GUID implies that the SVSM_ATTEST_SERVICES call should
>     be used to request the attestation report. A non-null GUID implies
>     that the SVSM_ATTEST_SINGLE_SERVICE call should be used.
>
>   - 'service_manifest_version' (input)
>     Used with the SVSM_ATTEST_SINGLE_SERVICE call, the service version
>     represents a specific service manifest version be used for the
>     attestation report.
>
>   - 'manifestblob' (output)
>     Used to return the service manifest associated with the attestation
>     report.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---
>  Documentation/ABI/testing/configfs-tsm  |  59 ++++++++++
>  arch/x86/include/asm/sev.h              |  31 ++++-
>  arch/x86/kernel/sev.c                   |  50 ++++++++
>  drivers/virt/coco/sev-guest/sev-guest.c | 147 ++++++++++++++++++++++++
>  drivers/virt/coco/tsm.c                 |  95 ++++++++++++++-
>  include/linux/tsm.h                     |  11 ++
>  6 files changed, 390 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/ABI/testing/configfs-tsm b/Documentation/ABI/testing/configfs-tsm
> index dd24202b5ba5..a4663610bf7c 100644
> --- a/Documentation/ABI/testing/configfs-tsm
> +++ b/Documentation/ABI/testing/configfs-tsm
> @@ -31,6 +31,21 @@ Description:
>  		Standardization v2.03 Section 4.1.8.1 MSG_REPORT_REQ.
>  		https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/56421.pdf
>  
> +What:		/sys/kernel/config/tsm/report/$name/manifestblob
> +Date:		January, 2024
> +KernelVersion:	v6.9
> +Contact:	linux-coco@lists.linux.dev
> +Description:
> +		(RO) Optional supplemental data that a TSM may emit, visibility
> +		of this attribute depends on TSM, and may be empty if no
> +		manifest data is available.
> +
> +		When @provider is "sev_guest" and the "svsm" attribute is set
> +		this file contains the service manifest used for the SVSM
> +		attestation report from Secure VM Service Module for SEV-SNP
> +		Guests v1.00 Section 7.
> +		https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/58019.pdf
> +
>  What:		/sys/kernel/config/tsm/report/$name/provider
>  Date:		September, 2023
>  KernelVersion:	v6.7
> @@ -80,3 +95,47 @@ Contact:	linux-coco@lists.linux.dev
>  Description:
>  		(RO) Indicates the minimum permissible value that can be written
>  		to @privlevel.
> +
> +What:		/sys/kernel/config/tsm/report/$name/svsm
> +Date:		January, 2024
> +KernelVersion:	v6.9
> +Contact:	linux-coco@lists.linux.dev
> +Description:
> +		(WO) Attribute is visible if a TSM implementation provider
> +		supports the concept of attestation reports for TVMs running
> +		under an SVSM, like SEV-SNP. Specifying a 1 (or other boolean

Since service_guid can be used for non SVSM services as well, can we use
a generic term "service" here? And let user specify the service type
(like service=svsm)

> +		equivalent, e.g. "Y") implies that the attestation report
> +		should come from the SVSM.
> +		Secure VM Service Module for SEV-SNP Guests v1.00 Section 7.
> +		https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/58019.pdf
> +
> +What:		/sys/kernel/config/tsm/report/$name/service_guid
> +Date:		January, 2024
> +KernelVersion:	v6.9
> +Contact:	linux-coco@lists.linux.dev
> +Description:
> +		(WO) Attribute is visible if a TSM implementation provider
> +		supports the concept of attestation reports for TVMs running
> +		under an SVSM, like SEV-SNP. Specifying a empty or null GUID
> +		(00000000-0000-0000-0000-000000) requests all active services
> +		within the SVSM be part of the attestation report. Specifying
> +		a non-null GUID requests an attestation report of just the
> +		specified service using the manifest form specified by the
> +		service_manifest_version attribute.
> +		Secure VM Service Module for SEV-SNP Guests v1.00 Section 7.
> +		https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/58019.pdf
> +

I think it will be useful to the user if there is a attribute to list the service GUIDs
supported. It can help prevent user using incorrect or unsupported GUIDs.

> +What:		/sys/kernel/config/tsm/report/$name/service_manifest_version
> +Date:		January, 2024
> +KernelVersion:	v6.9
> +Contact:	linux-coco@lists.linux.dev
> +Description:
> +		(WO) Attribute is visible if a TSM implementation provider
> +		supports the concept of attestation reports for TVMs running
> +		under an SVSM, like SEV-SNP. Indicates the service manifest
> +		version requested for the attestation report. If this field
> +		is not set by the user, the default manifest version of the
> +		service (the service's initial/first manifest version) is
> +		returned. The initial manifest version is always available.
> +		Secure VM Service Module for SEV-SNP Guests v1.00 Section 7.
> +		https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/58019.pdf
> diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
> index 34bc84aee969..76fabc7b5e97 100644
> --- a/arch/x86/include/asm/sev.h
> +++ b/arch/x86/include/asm/sev.h
> @@ -209,6 +209,27 @@ struct svsm_pvalidate_call {
>  	struct svsm_pvalidate_entry entry[];
>  };
>  
> +/*
> + * The SVSM Attestation related structures
> + */
> +struct svsm_location_entry {
> +	u64 pa;
> +	u32 len;
> +	u8 rsvd[4];
> +};
> +
> +struct svsm_attestation_call {
> +	struct svsm_location_entry report_buffer;
> +	struct svsm_location_entry nonce;
> +	struct svsm_location_entry manifest_buffer;
> +	struct svsm_location_entry certificates_buffer;
> +
> +	/* For attesting a single service */
> +	u8 service_guid[16];
> +	u32 service_manifest_version;
> +	u8 rsvd[4];
> +};
> +
>  /*
>   * SVSM protocol structure
>   */
> @@ -232,6 +253,10 @@ struct svsm_call {
>  #define SVSM_CORE_CREATE_VCPU		2
>  #define SVSM_CORE_DELETE_VCPU		3
>  
> +#define SVSM_ATTEST_CALL(x)		((1ULL << 32) | (x))
> +#define SVSM_ATTEST_SERVICES		0
> +#define SVSM_ATTEST_SINGLE_SERVICE	1
> +
>  #ifdef CONFIG_AMD_MEM_ENCRYPT
>  extern void __sev_es_ist_enter(struct pt_regs *regs);
>  extern void __sev_es_ist_exit(void);
> @@ -302,6 +327,7 @@ void snp_set_wakeup_secondary_cpu(void);
>  bool snp_init(struct boot_params *bp);
>  void __noreturn snp_abort(void);
>  int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio);
> +int snp_issue_svsm_attestation_request(u64 call_id, struct svsm_attestation_call *input);
>  void snp_accept_memory(phys_addr_t start, phys_addr_t end);
>  u64 snp_get_unsupported_features(u64 status);
>  u64 sev_get_status(void);
> @@ -333,7 +359,10 @@ static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *in
>  {
>  	return -ENOTTY;
>  }
> -
> +static inline int snp_issue_svsm_attestation_request(u64 call_id, struct svsm_attestation_call *input)
> +{
> +	return -ENOTTY;
> +}
>  static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
>  static inline u64 snp_get_unsupported_features(u64 status) { return 0; }
>  static inline u64 sev_get_status(void) { return 0; }
> diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
> index 8682af55802c..4e460d9eba77 100644
> --- a/arch/x86/kernel/sev.c
> +++ b/arch/x86/kernel/sev.c
> @@ -2402,6 +2402,56 @@ static int __init init_sev_config(char *str)
>  }
>  __setup("sev=", init_sev_config);
>  
> +static void update_attestation_input(struct svsm_call *call, struct svsm_attestation_call *input)
> +{
> +	/* If (new) lengths have been returned, propograte them up */
> +	if (call->rcx_out != call->rcx)
> +		input->manifest_buffer.len = call->rcx_out;
> +
> +	if (call->rdx_out != call->rdx)
> +		input->certificates_buffer.len = call->rdx_out;
> +
> +	if (call->r8_out != call->r8)
> +		input->report_buffer.len = call->r8_out;
> +}
> +
> +int snp_issue_svsm_attestation_request(u64 call_id, struct svsm_attestation_call *input)
> +{
> +	struct svsm_attestation_call *attest_call;
> +	struct svsm_call call = {};
> +	unsigned long flags;
> +	u64 attest_call_pa;
> +	int ret;
> +
> +	if (!vmpl)
> +		return -EINVAL;
> +
> +	local_irq_save(flags);
> +
> +	call.caa = __svsm_get_caa();
> +
> +	attest_call = (struct svsm_attestation_call *)call.caa->svsm_buffer;
> +	attest_call_pa = __svsm_get_caa_pa() + offsetof(struct svsm_ca, svsm_buffer);
> +
> +	*attest_call = *input;
> +
> +	/*
> +	 * Set input registers for the request and set RDX and R8 to known
> +	 * values in order to detect length values being returned in them.
> +	 */
> +	call.rax = call_id;
> +	call.rcx = attest_call_pa;
> +	call.rdx = -1;
> +	call.r8 = -1;
> +	ret = svsm_protocol(&call);
> +	update_attestation_input(&call, input);
> +
> +	local_irq_restore(flags);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(snp_issue_svsm_attestation_request);
> +
>  int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio)
>  {
>  	struct ghcb_state state;
> diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/sev-guest.c
> index bba6531cb606..9daec0ea386e 100644
> --- a/drivers/virt/coco/sev-guest/sev-guest.c
> +++ b/drivers/virt/coco/sev-guest/sev-guest.c
> @@ -38,6 +38,8 @@
>  #define SNP_REQ_MAX_RETRY_DURATION	(60*HZ)
>  #define SNP_REQ_RETRY_DELAY		(2*HZ)
>  
> +#define SVSM_MAX_RETRIES		3
> +
>  struct snp_guest_crypto {
>  	struct crypto_aead *tfm;
>  	u8 *iv, *authtag;
> @@ -783,6 +785,148 @@ struct snp_msg_cert_entry {
>  	u32 length;
>  };
>  
> +static int sev_svsm_report_new(struct tsm_report *report, void *data)
> +{
> +	unsigned int report_len, manifest_len, certificates_len;
> +	void *report_blob, *manifest_blob, *certificates_blob;
> +	struct svsm_attestation_call attest_call = {};
> +	struct tsm_desc *desc = &report->desc;
> +	unsigned int retry_count;
> +	unsigned int size;
> +	bool try_again;
> +	void *buffer;
> +	u64 call_id;
> +	int ret;
> +
> +	/*
> +	 * Allocate pages for the request:
> +	 * - Report blob (4K)
> +	 * - Manifest blob (4K)
> +	 * - Certificate blob (16K)
> +	 *
> +	 * Above addresses must be 4K aligned
> +	 */
> +	report_len = SZ_4K;
> +	manifest_len = SZ_4K;
> +	certificates_len = SEV_FW_BLOB_MAX_SIZE;
> +
> +	retry_count = 0;
> +
> +retry:
> +	size = report_len + manifest_len + certificates_len;
> +	buffer = alloc_pages_exact(size, __GFP_ZERO);
> +	if (!buffer)
> +		return -ENOMEM;
> +
> +	report_blob = buffer;
> +	attest_call.report_buffer.pa = __pa(report_blob);
> +	attest_call.report_buffer.len = report_len;
> +
> +	manifest_blob = report_blob + report_len;
> +	attest_call.manifest_buffer.pa = __pa(manifest_blob);
> +	attest_call.manifest_buffer.len = manifest_len;
> +
> +	certificates_blob = manifest_blob + manifest_len;
> +	attest_call.certificates_buffer.pa = __pa(certificates_blob);
> +	attest_call.certificates_buffer.len = certificates_len;
> +
> +	attest_call.nonce.pa = __pa(desc->inblob);
> +	attest_call.nonce.len = desc->inblob_len;
> +
> +	if (guid_is_null(&desc->service_guid)) {
> +		call_id = SVSM_ATTEST_CALL(SVSM_ATTEST_SERVICES);
> +	} else {
> +		export_guid(attest_call.service_guid, &desc->service_guid);
> +		attest_call.service_manifest_version = desc->service_manifest_version;
> +
> +		call_id = SVSM_ATTEST_CALL(SVSM_ATTEST_SINGLE_SERVICE);
> +	}

Above initialization will not change during retry, right? Why not move it above
retry?

> +
> +	ret = snp_issue_svsm_attestation_request(call_id, &attest_call);
> +	switch (ret) {
> +	case SVSM_SUCCESS:
> +		break;
> +	case SVSM_ERR_INVALID_PARAMETER:
> +		ret = -EINVAL;
> +
> +		if (retry_count >= SVSM_MAX_RETRIES)
> +			goto error;
> +
> +		try_again = false;
> +
> +		if (attest_call.report_buffer.len > report_len) {
> +			report_len = PAGE_ALIGN(attest_call.report_buffer.len);
> +			try_again = true;
> +		}
> +
> +		if (attest_call.manifest_buffer.len > manifest_len) {
> +			manifest_len = PAGE_ALIGN(attest_call.manifest_buffer.len);
> +			try_again = true;
> +		}
> +
> +		if (attest_call.certificates_buffer.len > certificates_len) {
> +			certificates_len = PAGE_ALIGN(attest_call.certificates_buffer.len);
> +			try_again = true;
> +		}
> +
> +		/* If one of the buffers wasn't large enough, retry the request */
> +		if (try_again) {
> +			free_pages_exact(buffer, size);
> +			retry_count++;
> +			goto retry;
> +		}
> +
> +		goto error;
> +	case SVSM_ERR_BUSY:
> +		ret = -EAGAIN;
> +		goto error;
> +	default:
> +		pr_err_ratelimited("SVSM attestation request failed (%#x)\n", ret);
> +		ret = -EINVAL;
> +		goto error;
> +	}
> +
> +	ret = -ENOMEM;
> +
> +	report_len = attest_call.report_buffer.len;
> +	void *rbuf __free(kvfree) = kvzalloc(report_len, GFP_KERNEL);
> +	if (!rbuf)
> +		goto error;
> +
> +	memcpy(rbuf, report_blob, report_len);
> +	report->outblob = no_free_ptr(rbuf);
> +	report->outblob_len = report_len;
> +
> +	manifest_len = attest_call.manifest_buffer.len;
> +	void *mbuf __free(kvfree) = kvzalloc(manifest_len, GFP_KERNEL);
> +	if (!mbuf)
> +		goto error;
> +
> +	memcpy(mbuf, manifest_blob, manifest_len);
> +	report->manifestblob = no_free_ptr(mbuf);
> +	report->manifestblob_len = manifest_len;
> +
> +	certificates_len = attest_call.certificates_buffer.len;
> +	if (!certificates_len)
> +		goto success;
> +
> +	void *cbuf __free(kvfree) = kvzalloc(certificates_len, GFP_KERNEL);
> +	if (!cbuf)
> +		goto error;
> +
> +	memcpy(cbuf, certificates_blob, certificates_len);
> +	report->auxblob = no_free_ptr(cbuf);
> +	report->auxblob_len = certificates_len;
> +
> +success:
> +	ret = 0;
> +
> +error:
> +	free_pages_exact(buffer, size);
> +
> +	return ret;
> +}
> +
>  static int sev_report_new(struct tsm_report *report, void *data)
>  {
>  	struct snp_msg_cert_entry *cert_table;
> @@ -797,6 +941,9 @@ static int sev_report_new(struct tsm_report *report, void *data)
>  	if (desc->inblob_len != SNP_REPORT_USER_DATA_SIZE)
>  		return -EINVAL;
>  
> +	if (desc->svsm)
> +		return sev_svsm_report_new(report, data);
> +
>  	void *buf __free(kvfree) = kvzalloc(size, GFP_KERNEL);
>  	if (!buf)
>  		return -ENOMEM;
> diff --git a/drivers/virt/coco/tsm.c b/drivers/virt/coco/tsm.c
> index d1c2db83a8ca..07b4c95ce704 100644
> --- a/drivers/virt/coco/tsm.c
> +++ b/drivers/virt/coco/tsm.c
> @@ -35,7 +35,7 @@ static DECLARE_RWSEM(tsm_rwsem);
>   * The attestation report format is TSM provider specific, when / if a standard
>   * materializes that can be published instead of the vendor layout. Until then
>   * the 'provider' attribute indicates the format of 'outblob', and optionally
> - * 'auxblob'.
> + * 'auxblob' and 'manifestblob'.
>   */
>  
>  struct tsm_report_state {
> @@ -48,6 +48,7 @@ struct tsm_report_state {
>  enum tsm_data_select {
>  	TSM_REPORT,
>  	TSM_CERTS,
> +	TSM_MANIFEST,
>  };
>  
>  static struct tsm_report *to_tsm_report(struct config_item *cfg)
> @@ -119,6 +120,77 @@ static ssize_t tsm_report_privlevel_floor_show(struct config_item *cfg,
>  }
>  CONFIGFS_ATTR_RO(tsm_report_, privlevel_floor);
>  
> +static ssize_t tsm_report_svsm_store(struct config_item *cfg,
> +				     const char *buf, size_t len)
> +{
> +	struct tsm_report *report = to_tsm_report(cfg);
> +	bool val;
> +	int rc;
> +
> +	rc = kstrtobool(buf, &val);
> +	if (rc)
> +		return rc;
> +
> +	guard(rwsem_write)(&tsm_rwsem);
> +	rc = try_advance_write_generation(report);
> +	if (rc)
> +		return rc;
> +	report->desc.svsm = val;
> +
> +	return len;
> +}
> +CONFIGFS_ATTR_WO(tsm_report_, svsm);
> +
> +static ssize_t tsm_report_service_guid_store(struct config_item *cfg,
> +					     const char *buf, size_t len)
> +{
> +	struct tsm_report *report = to_tsm_report(cfg);
> +	size_t guid_len;
> +	int rc;
> +
> +	guard(rwsem_write)(&tsm_rwsem);
> +	rc = try_advance_write_generation(report);
> +	if (rc)
> +		return rc;
> +
> +	/* Obtain the GUID string length */
> +	guid_len = (len && buf[len - 1] == '\n') ? len - 1 : len;
> +	if (guid_len && guid_len != UUID_STRING_LEN)
> +		return -EINVAL;
> +

I don't think you need above checks. I think guid_parse will fail, if it is not
a valid GUID.

> +	if (guid_len == UUID_STRING_LEN) {
> +		rc = guid_parse(buf, &report->desc.service_guid);
> +		if (rc)
> +			return rc;
> +	} else {
> +		report->desc.service_guid = guid_null;

I think the default value will be guid_null right, why reset it to NULL for every failed attempt?

> +	}
> +
> +	return len;
> +}
> +CONFIGFS_ATTR_WO(tsm_report_, service_guid);
> +
> +static ssize_t tsm_report_service_manifest_version_store(struct config_item *cfg,
> +							 const char *buf, size_t len)
> +{
> +	struct tsm_report *report = to_tsm_report(cfg);
> +	unsigned int val;
> +	int rc;
> +
> +	rc = kstrtouint(buf, 0, &val);
> +	if (rc)
> +		return rc;
> +
> +	guard(rwsem_write)(&tsm_rwsem);
> +	rc = try_advance_write_generation(report);
> +	if (rc)
> +		return rc;
> +	report->desc.service_manifest_version = val;
> +
> +	return len;
> +}
> +CONFIGFS_ATTR_WO(tsm_report_, service_manifest_version);
> +
>  static ssize_t tsm_report_inblob_write(struct config_item *cfg,
>  				       const void *buf, size_t count)
>  {
> @@ -163,6 +235,9 @@ static ssize_t __read_report(struct tsm_report *report, void *buf, size_t count,
>  	if (select == TSM_REPORT) {
>  		out = report->outblob;
>  		len = report->outblob_len;
> +	} else if (select == TSM_MANIFEST) {
> +		out = report->manifestblob;
> +		len = report->manifestblob_len;
>  	} else {
>  		out = report->auxblob;
>  		len = report->auxblob_len;
> @@ -188,7 +263,7 @@ static ssize_t read_cached_report(struct tsm_report *report, void *buf,
>  
>  	/*
>  	 * A given TSM backend always fills in ->outblob regardless of
> -	 * whether the report includes an auxblob or not.
> +	 * whether the report includes an auxblob/manifestblob or not.
>  	 */
>  	if (!report->outblob ||
>  	    state->read_generation != state->write_generation)
> @@ -224,8 +299,10 @@ static ssize_t tsm_report_read(struct tsm_report *report, void *buf,
>  
>  	kvfree(report->outblob);
>  	kvfree(report->auxblob);
> +	kvfree(report->manifestblob);
>  	report->outblob = NULL;
>  	report->auxblob = NULL;
> +	report->manifestblob = NULL;
>  	rc = ops->report_new(report, provider.data);
>  	if (rc < 0)
>  		return rc;
> @@ -252,6 +329,15 @@ static ssize_t tsm_report_auxblob_read(struct config_item *cfg, void *buf,
>  }
>  CONFIGFS_BIN_ATTR_RO(tsm_report_, auxblob, NULL, TSM_OUTBLOB_MAX);
>  
> +static ssize_t tsm_report_manifestblob_read(struct config_item *cfg, void *buf,
> +					    size_t count)
> +{
> +	struct tsm_report *report = to_tsm_report(cfg);
> +
> +	return tsm_report_read(report, buf, count, TSM_MANIFEST);
> +}
> +CONFIGFS_BIN_ATTR_RO(tsm_report_, manifestblob, NULL, TSM_OUTBLOB_MAX);
> +
>  #define TSM_DEFAULT_ATTRS() \
>  	&tsm_report_attr_generation, \
>  	&tsm_report_attr_provider
> @@ -265,6 +351,9 @@ static struct configfs_attribute *tsm_report_extra_attrs[] = {
>  	TSM_DEFAULT_ATTRS(),
>  	&tsm_report_attr_privlevel,
>  	&tsm_report_attr_privlevel_floor,
> +	&tsm_report_attr_svsm,
> +	&tsm_report_attr_service_guid,
> +	&tsm_report_attr_service_manifest_version,
>  	NULL,
>  };
>  
> @@ -280,6 +369,7 @@ static struct configfs_bin_attribute *tsm_report_bin_attrs[] = {
>  static struct configfs_bin_attribute *tsm_report_bin_extra_attrs[] = {
>  	TSM_DEFAULT_BIN_ATTRS(),
>  	&tsm_report_attr_auxblob,
> +	&tsm_report_attr_manifestblob,
>  	NULL,
>  };
>  
> @@ -288,6 +378,7 @@ static void tsm_report_item_release(struct config_item *cfg)
>  	struct tsm_report *report = to_tsm_report(cfg);
>  	struct tsm_report_state *state = to_state(report);
>  
> +	kvfree(report->manifestblob);
>  	kvfree(report->auxblob);
>  	kvfree(report->outblob);
>  	kfree(state);
> diff --git a/include/linux/tsm.h b/include/linux/tsm.h
> index 50c5769657d8..c4aed3059500 100644
> --- a/include/linux/tsm.h
> +++ b/include/linux/tsm.h
> @@ -4,6 +4,7 @@
>  
>  #include <linux/sizes.h>
>  #include <linux/types.h>
> +#include <linux/uuid.h>
>  
>  #define TSM_INBLOB_MAX 64
>  #define TSM_OUTBLOB_MAX SZ_32K
> @@ -19,11 +20,17 @@
>   * @privlevel: optional privilege level to associate with @outblob
>   * @inblob_len: sizeof @inblob
>   * @inblob: arbitrary input data
> + * @svsm: optional indicator of where to obtain the tsm report blob
> + * @service_guid: optional SVSM service guid to attest
> + * @service_manifest_version: optional SVSM service manifest version requested
>   */
>  struct tsm_desc {
>  	unsigned int privlevel;
>  	size_t inblob_len;
>  	u8 inblob[TSM_INBLOB_MAX];
> +	bool svsm;
> +	guid_t service_guid;
> +	unsigned int service_manifest_version;
>  };
>  
>  /**
> @@ -33,6 +40,8 @@ struct tsm_desc {
>   * @outblob: generated evidence to provider to the attestation agent
>   * @auxblob_len: sizeof(@auxblob)
>   * @auxblob: (optional) auxiliary data to the report (e.g. certificate data)
> + * @manifestblob_len: sizeof(@manifestblob)
> + * @manifestblob: (optional) manifest data associated with the report
>   */
>  struct tsm_report {
>  	struct tsm_desc desc;
> @@ -40,6 +49,8 @@ struct tsm_report {
>  	u8 *outblob;
>  	size_t auxblob_len;
>  	u8 *auxblob;
> +	size_t manifestblob_len;
> +	u8 *manifestblob;
>  };
>  
>  /**

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer