crypto: ccp: Add external API interface for PSP module initialization

KVM is dependent on the PSP SEV driver and PSP SEV driver needs to be
loaded before KVM module. In case of module loading any dependent
modules are automatically loaded but in case of built-in modules there
is no inherent mechanism available to specify dependencies between
modules and ensure that any dependent modules are loaded implicitly.

Add a new external API interface for PSP module initialization which
allows PSP SEV driver to be loaded explicitly if KVM is built-in.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Co-developed-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-ID: <15279ca0cad56a07cf12834ec544310f85ff5edc.1739226950.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/drivers/crypto/ccp/sp-dev.c b/drivers/crypto/ccp/sp-dev.c
index 7eb3e46682860c975f74e392beb87995f78d2913..3467f6db4f505a2fbca05e36878b1d20f6ec556c 100644 (file)
--- a/drivers/crypto/ccp/sp-dev.c
+++ b/drivers/crypto/ccp/sp-dev.c
@@ -19,6 +19,7 @@
 #include <linux/types.h>
 #include <linux/ccp.h>
 
+#include "sev-dev.h"
 #include "ccp-dev.h"
 #include "sp-dev.h"
 
@@ -253,8 +254,12 @@ unlock:
 static int __init sp_mod_init(void)
 {
 #ifdef CONFIG_X86
+       static bool initialized;
        int ret;
 
+       if (initialized)
+               return 0;
+
        ret = sp_pci_init();
        if (ret)
                return ret;
@@ -263,6 +268,8 @@ static int __init sp_mod_init(void)
        psp_pci_init();
 #endif
 
+       initialized = true;
+
        return 0;
 #endif
 
@@ -279,6 +286,13 @@ static int __init sp_mod_init(void)
        return -ENODEV;
 }
 
+#if IS_BUILTIN(CONFIG_KVM_AMD) && IS_ENABLED(CONFIG_KVM_AMD_SEV)
+int __init sev_module_init(void)
+{
+       return sp_mod_init();
+}
+#endif
+
 static void __exit sp_mod_exit(void)
 {
 #ifdef CONFIG_X86

diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
index 903ddfea858505472e0d8cd8a4874755dabb6607..f3cad182d4ef6f05dbc80673376b17c5ff66d688 100644 (file)
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -814,6 +814,15 @@ struct sev_data_snp_commit {
 
 #ifdef CONFIG_CRYPTO_DEV_SP_PSP
 
+/**
+ * sev_module_init - perform PSP SEV module initialization
+ *
+ * Returns:
+ * 0 if the PSP module is successfully initialized
+ * negative value if the PSP module initialization fails
+ */
+int sev_module_init(void);
+
 /**
  * sev_platform_init - perform SEV INIT command
  *