Commit 582fab52 authored by hanliyang's avatar hanliyang
Browse files

crypto: ccp: Implement CSV_DOWNLOAD_FIRMWARE ioctl command 

hygon inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I98VXP


CVE: NA

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

The CSV_DOWNLOAD_FIRMWARE command can be used by the platform owner to
updating CSV firmware.

Signed-off-by: default avatarhanliyang <hanliyang@hygon.cn>
parent bdea62e9

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

+72 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <uapi/linux/psp-hygon.h>



#include "psp-dev.h"

#include "csv-dev.h"



/*

 * Hygon CSV build info:
@@ -90,6 +91,74 @@ static int csv_ioctl_do_hgsc_import(struct sev_issue_cmd *argp) 
	return ret;

}



static int csv_ioctl_do_download_firmware(struct sev_issue_cmd *argp)

{

	struct sev_data_download_firmware *data = NULL;

	struct csv_user_data_download_firmware input;

	int ret, order;

	struct page *p;

	u64 data_size;



	/* Only support DOWNLOAD_FIRMWARE if build greater or equal 1667 */

	if (!csv_version_greater_or_equal(1667)) {

		pr_err("DOWNLOAD_FIRMWARE not supported\n");

		return -EIO;

	}



	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))

		return -EFAULT;



	if (!input.address) {

		argp->error = SEV_RET_INVALID_ADDRESS;

		return -EINVAL;

	}



	if (!input.length || input.length > CSV_FW_MAX_SIZE) {

		argp->error = SEV_RET_INVALID_LEN;

		return -EINVAL;

	}



	/*

	 * CSV FW expects the physical address given to it to be 32

	 * byte aligned. Memory allocated has structure placed at the

	 * beginning followed by the firmware being passed to the CSV

	 * FW. Allocate enough memory for data structure + alignment

	 * padding + CSV FW.

	 */

	data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);



	order = get_order(input.length + data_size);

	p = alloc_pages(GFP_KERNEL, order);

	if (!p)

		return -ENOMEM;



	/*

	 * Copy firmware data to a kernel allocated contiguous

	 * memory region.

	 */

	data = page_address(p);

	if (copy_from_user((void *)(page_address(p) + data_size),

			   (void *)input.address, input.length)) {

		ret = -EFAULT;

		goto err_free_page;

	}



	data->address = __psp_pa(page_address(p) + data_size);

	data->len = input.length;



	ret = hygon_psp_hooks.__sev_do_cmd_locked(SEV_CMD_DOWNLOAD_FIRMWARE,

						  data, &argp->error);

	if (ret)

		pr_err("Failed to update CSV firmware: %#x\n", argp->error);

	else

		pr_info("CSV firmware update successful\n");



err_free_page:

	__free_pages(p, order);



	return ret;

}



static long csv_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)

{

	void __user *argp = (void __user *)arg;
@@ -123,6 +192,9 @@ static long csv_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) 
	case CSV_PLATFORM_SHUTDOWN:

		ret = hygon_psp_hooks.__sev_platform_shutdown_locked(&input.error);

		break;

	case CSV_DOWNLOAD_FIRMWARE:

		ret = csv_ioctl_do_download_firmware(&input);

		break;

	default:

		/*

		 * If the command is compatible between CSV and SEV, the

include/linux/psp-hygon.h

+2 −0
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 
/***************************** CSV interface *********************************/

/*****************************************************************************/



#define CSV_FW_MAX_SIZE		0x80000	/* 512KB */



/**

 * Guest/platform management commands for CSV

 */

include/uapi/linux/psp-hygon.h

+12 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
enum {

	CSV_PLATFORM_INIT = 101,

	CSV_PLATFORM_SHUTDOWN = 102,

	CSV_DOWNLOAD_FIRMWARE = 128,

	CSV_HGSC_CERT_IMPORT = 201,



	CSV_MAX,
@@ -43,4 +44,15 @@ struct csv_user_data_hgsc_cert_import { 
	__u32 hgsc_cert_len;                    /* In */

} __packed;



/**

 * struct csv_user_data_download_firmware - DOWNLOAD_FIRMWARE command parameters

 *

 * @address: physical address of CSV firmware image

 * @length: length of the CSV firmware image

 */

struct csv_user_data_download_firmware {

	__u64 address;				/* In */

	__u32 length;				/* In */

} __packed;



#endif	/* __PSP_HYGON_USER_H__ */