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

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Message-ID: <7a247f583553ea0b24ff772885570082a42f8c2f.1733785468.git.ashish.kalra@amd.com>
Date: Mon, 9 Dec 2024 23:26:03 +0000
From: Ashish Kalra <Ashish.Kalra@....com>
To: <seanjc@...gle.com>, <pbonzini@...hat.com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, <hpa@...or.com>, <thomas.lendacky@....com>,
	<john.allen@....com>, <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC: <michael.roth@....com>, <dionnaglaze@...gle.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
	<linux-coco@...ts.linux.dev>
Subject: [PATCH 5/7] crypto: ccp: Add new SEV/SNP platform shutdown API

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

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

Signed-off-by: Ashish Kalra <ashish.kalra@....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 21faf4c4c4ec..b8938c96915b 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -2468,6 +2468,19 @@ 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