[RFC v1 3/6] crypto/ccp: Add DOWNLOAD_FIRMWARE_EX message struct

[Tycho Andersen <tycho@kernel.org>]

From: "Tycho Andersen (AMD)" <tycho@kernel.org>

...and appropriate sizeof() in sev_cmd_buffer_len() for use in
do_sev_cmd(). The message is documented in SEV-SNP firmware document id
56860.

Signed-off-by: Tycho Andersen (AMD) <tycho@kernel.org>
---
 drivers/crypto/ccp/sev-dev.c |  1 +
 include/linux/psp-sev.h      | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 7ca29ccda0e7..defdc1bc226e 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -252,6 +252,7 @@ static int sev_cmd_buffer_len(int cmd)
 	case SEV_CMD_SNP_PLATFORM_STATUS:	return sizeof(struct sev_data_snp_addr);
 	case SEV_CMD_SNP_GUEST_REQUEST:		return sizeof(struct sev_data_snp_guest_request);
 	case SEV_CMD_SNP_CONFIG:		return sizeof(struct sev_user_data_snp_config);
+	case SEV_CMD_SNP_DOWNLOAD_FIRMWARE_EX:	return sizeof(struct sev_data_download_firmware_ex);
 	case SEV_CMD_SNP_COMMIT:		return sizeof(struct sev_data_snp_commit);
 	case SEV_CMD_SNP_FEATURE_INFO:		return sizeof(struct sev_data_snp_feature_info);
 	case SEV_CMD_SNP_VLEK_LOAD:		return sizeof(struct sev_user_data_snp_vlek_load);
diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
index d5099a2baca5..5227e901bff2 100644
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -855,6 +855,26 @@ struct sev_platform_init_args {
 	unsigned int max_snp_asid;
 };
 
+/**
+ * struct sev_data_download_firmware_ex
+ *
+ * @len: length of the command buffer read by the PSP
+ * @rsvd0: reserved
+ * @fw_paddr: physical address of the start of the firmware blob
+ * @fw_len: length of the firmware blob
+ * @commit: whether to immediately commit the firmware update. If set, this
+ *  operation behaves like DOWNLOAD_FIRMWARE.
+ * @rsvd1: reserved
+ */
+struct sev_data_download_firmware_ex {
+	u32 len;		/* In */
+	u32 rsvd0;
+	u64 fw_paddr;		/* In */
+	u32 fw_len;		/* In */
+	u32 commit:1;		/* In */
+	u32 rsvd1:31;
+} __packed;
+
 /**
  * struct sev_data_snp_commit - SNP_COMMIT structure
  *
-- 
2.54.0