linux-kernel - [PATCH v2 17/25] crypto: ccp: Handle non-volatile INIT

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Message-ID: <20240126041126.1927228-18-michael.roth@amd.com>
Date: Thu, 25 Jan 2024 22:11:17 -0600
From: Michael Roth <michael.roth@....com>
To: <x86@...nel.org>
CC: <kvm@...r.kernel.org>, <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <jroedel@...e.de>,
	<thomas.lendacky@....com>, <hpa@...or.com>, <ardb@...nel.org>,
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	<pankaj.gupta@....com>, <liam.merwick@...cle.com>
Subject: [PATCH v2 17/25] crypto: ccp: Handle non-volatile INIT_EX data when SNP is enabled

From: Tom Lendacky <thomas.lendacky@....com>

For SEV/SEV-ES, a buffer can be used to access non-volatile data so it
can be initialized from a file specified by the init_ex_path CCP module
parameter instead of relying on the SPI bus for NV storage, and
afterward the buffer can be read from to sync new data back to the file.

When SNP is enabled, the pages comprising this buffer need to be set to
firmware-owned in the RMP table before they can be accessed by firmware
for subsequent updates to the initial contents.

Implement that handling here.

Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
Co-developed-by: Michael Roth <michael.roth@....com>
Signed-off-by: Michael Roth <michael.roth@....com>
---
 drivers/crypto/ccp/sev-dev.c | 47 ++++++++++++++++++++++++------------
 1 file changed, 32 insertions(+), 15 deletions(-)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index fa992ce57ffe..97fdd98e958c 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -785,10 +785,38 @@ static int __sev_platform_init_locked(int *error)
 		}
 	}
 
-	if (sev_init_ex_buffer) {
+	/*
+	 * If an init_ex_path is provided allocate a buffer for the file and
+	 * read in the contents. Additionally, if SNP is initialized, convert
+	 * the buffer pages to firmware pages.
+	 */
+	if (init_ex_path && !sev_init_ex_buffer) {
+		struct page *page;
+
+		page = alloc_pages(GFP_KERNEL, get_order(NV_LENGTH));
+		if (!page) {
+			dev_err(sev->dev, "SEV: INIT_EX NV memory allocation failed\n");
+			return -ENOMEM;
+		}
+
+		sev_init_ex_buffer = page_address(page);
+
 		rc = sev_read_init_ex_file();
 		if (rc)
 			return rc;
+
+		/* If SEV-SNP is initialized, transition to firmware page. */
+		if (sev->snp_initialized) {
+			unsigned long npages;
+
+			npages = 1UL << get_order(NV_LENGTH);
+			if (rmp_mark_pages_firmware(__pa(sev_init_ex_buffer),
+						    npages, false)) {
+				dev_err(sev->dev,
+					"SEV: INIT_EX NV memory page state change failed.\n");
+				return -ENOMEM;
+			}
+		}
 	}
 
 	rc = __sev_do_init_locked(&psp_ret);
@@ -1688,8 +1716,9 @@ static void sev_firmware_shutdown(struct sev_device *sev)
 	}
 
 	if (sev_init_ex_buffer) {
-		free_pages((unsigned long)sev_init_ex_buffer,
-			   get_order(NV_LENGTH));
+		__snp_free_firmware_pages(virt_to_page(sev_init_ex_buffer),
+					  get_order(NV_LENGTH),
+					  true);
 		sev_init_ex_buffer = NULL;
 	}
 
@@ -1743,18 +1772,6 @@ void sev_pci_init(void)
 	if (sev_update_firmware(sev->dev) == 0)
 		sev_get_api_version();
 
-	/* If an init_ex_path is provided rely on INIT_EX for PSP initialization
-	 * instead of INIT.
-	 */
-	if (init_ex_path) {
-		sev_init_ex_buffer = sev_fw_alloc(NV_LENGTH);
-		if (!sev_init_ex_buffer) {
-			dev_err(sev->dev,
-				"SEV: INIT_EX NV memory allocation failed\n");
-			goto err;
-		}
-	}
-
 	/* Initialize the platform */
 	args.probe = true;
 	rc = sev_platform_init(&args);
-- 
2.25.1