[stable-6.12 1/4] crypto: ccp - Add new SEV/SNP platform shutdown API

[Jack Wang <jinpu.wang@ionos.com>]

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

commit f7b86e0e75bc234751cb7a82d888083a57ef28b2 upstream.

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>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
 drivers/crypto/ccp/sev-dev.c | 9 +++++++++
 include/linux/psp-sev.h      | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index d668f9318c28..7c05cae7e577 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -2444,6 +2444,15 @@ 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 613a8209bed2..6a4435cfa977 100644
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -947,6 +947,7 @@ 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 */
 
@@ -981,6 +982,8 @@ 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__ */
-- 
2.43.0