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crypto: ccp: Provide an API to issue SEV and SNP commands

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Export sev_do_cmd() as a generic API for the hypervisor to issue
commands to manage an SEV or an SNP guest. The commands for SEV and SNP
are defined in the SEV and SEV-SNP firmware specifications.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240126041126.1927228-15-michael.roth@amd.com
This commit is contained in:
Brijesh Singh
2024-01-25 22:11:14 -06:00
committed by Borislav Petkov (AMD)
parent 1ca5614b84
commit 18085ac2f2
2 changed files with 21 additions and 1 deletions
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drivers/crypto/ccp/sev-dev.c
+2 -1
View File
@@ -431,7 +431,7 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
return ret;
}
static int sev_do_cmd(int cmd, void *data, int *psp_ret)
int sev_do_cmd(int cmd, void *data, int *psp_ret)
{
int rc;
@@ -441,6 +441,7 @@ static int sev_do_cmd(int cmd, void *data, int *psp_ret)
return rc;
}
EXPORT_SYMBOL_GPL(sev_do_cmd);
static int __sev_init_locked(int *error)
{
include/linux/psp-sev.h
+19
View File
@@ -915,6 +915,22 @@ int sev_guest_df_flush(int *error);
*/
int sev_guest_decommission(struct sev_data_decommission *data, int *error);
/**
* sev_do_cmd - issue an SEV or an SEV-SNP command
*
* @cmd: SEV or SEV-SNP firmware command to issue
* @data: arguments for firmware command
* @psp_ret: SEV command return code
*
* Returns:
* 0 if the SEV device successfully processed the command
* -%ENODEV if the PSP device is not available
* -%ENOTSUPP if PSP device does not support SEV
* -%ETIMEDOUT if the SEV command timed out
* -%EIO if PSP device returned a non-zero return code
*/
int sev_do_cmd(int cmd, void *data, int *psp_ret);
void *psp_copy_user_blob(u64 uaddr, u32 len);
#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
@@ -930,6 +946,9 @@ sev_guest_deactivate(struct sev_data_deactivate *data, int *error) { return -ENO
static inline int
sev_guest_decommission(struct sev_data_decommission *data, int *error) { return -ENODEV; }
static inline int
sev_do_cmd(int cmd, void *data, int *psp_ret) { return -ENODEV; }
static inline int
sev_guest_activate(struct sev_data_activate *data, int *error) { return -ENODEV; }