crypto: ccp - Add new SEV/SNP platform shutdown API

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

Reviewed-by: Dionna Glaze <dionnaglaze@google.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 6fdbb3bf44b5cf37e6af143ac29df27e6fa81470..671347702ae7a26cb63750c1cfc98cacfa7fb0b8 100644 (file)
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -2468,6 +2468,15 @@ static void sev_firmware_shutdown(struct sev_device *sev)
        mutex_unlock(&sev_cmd_mutex);
 }
 
+void sev_platform_shutdown(void)
+{
+       if (!psp_master || !psp_master->sev_data)
+               return;
+
+       sev_firmware_shutdown(psp_master->sev_data);
+}
+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 f3cad182d4ef6f05dbc80673376b17c5ff66d688..0b3a36bdaa90630717c29a707b9fb43d8c838b8d 100644 (file)
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -954,6 +954,7 @@ 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 */
 
@@ -988,6 +989,8 @@ 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__ */