Commit 7364a6fb authored by Tom Lendacky's avatar Tom Lendacky Committed by Borislav Petkov (AMD)

crypto: ccp: Handle non-volatile INIT_EX data when SNP is enabled

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.

  [ bp: Carve out allocation into a helper. ]
Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Co-developed-by: default avatarMichael Roth <michael.roth@amd.com>
Signed-off-by: default avatarMichael Roth <michael.roth@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240126041126.1927228-18-michael.roth@amd.com
parent 24512afa
...@@ -775,6 +775,48 @@ static void __sev_platform_init_handle_tmr(struct sev_device *sev) ...@@ -775,6 +775,48 @@ static void __sev_platform_init_handle_tmr(struct sev_device *sev)
} }
} }
/*
* 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.
*/
static int __sev_platform_init_handle_init_ex_path(struct sev_device *sev)
{
struct page *page;
int rc;
if (!init_ex_path)
return 0;
if (sev_init_ex_buffer)
return 0;
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;
}
}
return 0;
}
static int __sev_platform_init_locked(int *error) static int __sev_platform_init_locked(int *error)
{ {
int rc, psp_ret = SEV_RET_NO_FW_CALL; int rc, psp_ret = SEV_RET_NO_FW_CALL;
...@@ -790,11 +832,9 @@ static int __sev_platform_init_locked(int *error) ...@@ -790,11 +832,9 @@ static int __sev_platform_init_locked(int *error)
__sev_platform_init_handle_tmr(sev); __sev_platform_init_handle_tmr(sev);
if (sev_init_ex_buffer) { rc = __sev_platform_init_handle_init_ex_path(sev);
rc = sev_read_init_ex_file(); if (rc)
if (rc) return rc;
return rc;
}
rc = __sev_do_init_locked(&psp_ret); rc = __sev_do_init_locked(&psp_ret);
if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) { if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) {
...@@ -1693,8 +1733,9 @@ static void sev_firmware_shutdown(struct sev_device *sev) ...@@ -1693,8 +1733,9 @@ static void sev_firmware_shutdown(struct sev_device *sev)
} }
if (sev_init_ex_buffer) { if (sev_init_ex_buffer) {
free_pages((unsigned long)sev_init_ex_buffer, __snp_free_firmware_pages(virt_to_page(sev_init_ex_buffer),
get_order(NV_LENGTH)); get_order(NV_LENGTH),
true);
sev_init_ex_buffer = NULL; sev_init_ex_buffer = NULL;
} }
...@@ -1748,18 +1789,6 @@ void sev_pci_init(void) ...@@ -1748,18 +1789,6 @@ void sev_pci_init(void)
if (sev_update_firmware(sev->dev) == 0) if (sev_update_firmware(sev->dev) == 0)
sev_get_api_version(); 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 */ /* Initialize the platform */
args.probe = true; args.probe = true;
rc = sev_platform_init(&args); rc = sev_platform_init(&args);
......
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