[PATCH v3 5/7] crypto: ccp: Add new SEV/SNP platform shutdown API

Ashish Kalra
2025-01-03T20:01:49Z

From: Ashish Kalra <ashish.kalra@amd.com>

Add new API interface to do SEV/SNP platform shutdown when KVM module
is unloaded.

Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
---
drivers/crypto/ccp/sev-dev.c | 13 +++++++++++++
include/linux/psp-sev.h | 3 +++
2 files changed, 16 insertions(+)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 7c15dec55f58..1ad66c3451fb 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -2469,6 +2469,19 @@ static void sev_firmware_shutdown(struct sev_device *sev)
mutex_unlock(&sev_cmd_mutex);
}

+void sev_platform_shutdown(void)
+{
+ struct sev_device *sev;
+
+ if (!psp_master || !psp_master->sev_data)
+ return;
+
+ sev = psp_master->sev_data;
+
+ sev_firmware_shutdown(sev);
+}
+EXPORT_SYMBOL_GPL(sev_platform_shutdown);
+
void sev_dev_destroy(struct psp_device *psp)
{
struct sev_device *sev = psp->sev_data;
diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
index 903ddfea8585..fea20fbe2a8a 100644
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -945,6 +945,7 @@ int sev_do_cmd(int cmd, void *data, int *psp_ret);
void *psp_copy_user_blob(u64 uaddr, u32 len);
void *snp_alloc_firmware_page(gfp_t mask);
void snp_free_firmware_page(void *addr);
+void sev_platform_shutdown(void);

#else /* !CONFIG_CRYPTO_DEV_SP_PSP */

@@ -979,6 +980,8 @@ static inline void *snp_alloc_firmware_page(gfp_t mask)

static inline void snp_free_firmware_page(void *addr) { }

+static inline void sev_platform_shutdown(void) { }
+
#endif /* CONFIG_CRYPTO_DEV_SP_PSP */

#endif /* __PSP_SEV_H__ */
--
2.34.1