crypto: ccp: Implement CSV_PLATFORM_SHUTDOWN ioctl command

hygon inclusion
category: feature
CVE: NA

---------------------------

The CSV_PLATFORM_SHUTDOWN command can be used by the platform owner to
switch platform to PSTATE.UNINIT.

The DOWNLOAD_FIRMWARE API can only performed when platform is in the
PSTATE.UNINIT. In order to support DOWNLOAD_FIRMWARE at userspace, we
need invoke PLATFORM_SHUTDOWN before that.

Signed-off-by: hanliyang <hanliyang@hygon.cn>

Author: hanliyang

drivers/crypto/ccp/hygon/csv-dev.c

@@ -121,6 +121,9 @@ static long csv_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
 	case CSV_PLATFORM_INIT:
 		ret = hygon_psp_hooks.__sev_platform_init_locked(&input.error);
 		break;
+	case CSV_PLATFORM_SHUTDOWN:
+		ret = hygon_psp_hooks.__sev_platform_shutdown_locked(&input.error);
+		break;
 	default:
 		/*
 		 * If the command is compatible between CSV and SEV, the

drivers/crypto/ccp/hygon/psp-dev.h

@@ -26,6 +26,7 @@ extern struct hygon_psp_hooks_table {
 	struct mutex *sev_cmd_mutex;
 	int (*__sev_do_cmd_locked)(int cmd, void *data, int *psp_ret);
 	int (*__sev_platform_init_locked)(int *error);
+	int (*__sev_platform_shutdown_locked)(int *error);
 	long (*sev_ioctl)(struct file *file, unsigned int ioctl, unsigned long arg);
 } hygon_psp_hooks;
 

drivers/crypto/ccp/sev-dev.c

@@ -1264,6 +1264,7 @@ static void sev_dev_install_hooks(void)
 	hygon_psp_hooks.sev_cmd_mutex = &sev_cmd_mutex;
 	hygon_psp_hooks.__sev_do_cmd_locked = __sev_do_cmd_locked;
 	hygon_psp_hooks.__sev_platform_init_locked = __sev_platform_init_locked;
+	hygon_psp_hooks.__sev_platform_shutdown_locked = __sev_platform_shutdown_locked;
 	hygon_psp_hooks.sev_ioctl = sev_ioctl;
 
 	hygon_psp_hooks.sev_dev_hooks_installed = true;

include/uapi/linux/psp-hygon.h

@@ -22,6 +22,7 @@
  */
 enum {
 	CSV_PLATFORM_INIT = 101,
+	CSV_PLATFORM_SHUTDOWN = 102,
 	CSV_HGSC_CERT_IMPORT = 201,
 
 	CSV_MAX,