crypto/ccp/sev-dev.c

23 #include <linux/firmware.h>
44 /* Minimum firmware version required for the SEV-SNP support */
49  * Maximum number of firmware-writable buffers that might be specified
107  *   Array containing range of pages that firmware transitions to HV-fixed
418 	 * Try unrolling the firmware state changes by
420 	 * firmware state.
500  * parameters corresponding to buffers that may be written to by firmware.
527  * turn need to be transitioned to/from firmware-owned before/after
528  * executing the firmware command.
686 	/* Transition the buffer to firmware-owned. */
688 		pr_warn("Error moving pages to firmware-owned state for SEV legacy command.\n");
706 		pr_warn("Failed to reclaim firmware-owned pages while issuing SEV legacy command.\n");
806 	 * the firmware-owned state.
863 		 * sev_cmd_mutex, but there could be recursive firmware requests
877 				"SEV: too many firmware commands in progress, no command buffers available.\n");
885 		 * SNP firmware is in the INIT state.
938 		 * PSP firmware may report additional error information in the
1008 		 * address of the TMR (firmware should clear it anyway).
1031 		 * address of the TMR (firmware should clear it anyway).
1062 	 * Ensure the list of HV_FIXED pages that will be passed to firmware
1102 		dev_dbg(sev->dev, "SEV-SNP support requires firmware version >= %d:%d\n",
1111 	 * Starting in SNP firmware v1.52, the SNP_INIT_EX command takes a list
1124 		 * firmware page state.
1161 	 * - SEV_CMD_SNP_INIT[_EX] firmware command
1163 	 * - SEV_CMD_SNP_DF_FLUSH firmware command
1178 	dev_dbg(sev->dev, "SEV-SNP firmware initialized\n");
1193 		/* Must flush the cache before giving it to the firmware */
1204  * the buffer pages to firmware pages.
1229 	/* If SEV-SNP is initialized, transition to firmware page. */
1266 		 * status code, meaning that firmware load and validation of SEV
1290 	dev_dbg(sev->dev, "SEV firmware initialized\n");
1319 		 * continue to initialize the legacy SEV firmware.
1363 	dev_dbg(sev->dev, "SEV firmware shutdown\n");
1542 			    const struct firmware **firmware)
1568 	if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
1569 	    (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
1570 	    (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
1580 	const struct firmware *firmware;
1590 	if (sev_get_firmware(dev, &firmware) == -ENOENT) {
1591 		dev_dbg(dev, "No SEV firmware file present\n");
1598 	 * beginning followed by the firmware being passed to the SEV
1604 	order = get_order(firmware->size + data_size);
1612 	 * Copy firmware data to a kernel allocated contiguous
1616 	memcpy(page_address(p) + data_size, firmware->data, firmware->size);
1619 	data->len = firmware->size;
1625 	 * earlier firmware version than 1.50.
1631 		dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
1633 		dev_info(dev, "SEV firmware update successful\n");
1638 	release_firmware(firmware);
1680 		dev_err(sev->dev, "SEV-SNP firmware shutdown failed\n");
1693 	 * firmware now transitions these pages to Reclaim state and hypervisor
1704 	dev_dbg(sev->dev, "SEV-SNP firmware shutdown\n");
1969 	 * Firmware expects status page to be in firmware-owned state, otherwise
1970 	 * it will report firmware error code INVALID_PAGE_STATE (0x1A).
2155 	 * command to the firmware.