[PATCH v4 08/31] i386/sev: Add a sev_snp_enabled() helper

[Pankaj Gupta <pankaj.gupta@xxxxxxx>]

From: Michael Roth <michael.roth@xxxxxxx>

Add a simple helper to check if the current guest type is SNP. Also have
SNP-enabled imply that SEV-ES is enabled as well, and fix up any places
where the sev_es_enabled() check is expecting a pure/non-SNP guest.

Signed-off-by: Michael Roth <michael.roth@xxxxxxx>
Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
---
 target/i386/sev.c | 13 ++++++++++++-
 target/i386/sev.h |  2 ++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 841b45f59b..f4f1971202 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -333,12 +333,21 @@ sev_enabled(void)
     return !!object_dynamic_cast(OBJECT(cgs), TYPE_SEV_COMMON);
 }
 
+bool
+sev_snp_enabled(void)
+{
+    ConfidentialGuestSupport *cgs = MACHINE(qdev_get_machine())->cgs;
+
+    return !!object_dynamic_cast(OBJECT(cgs), TYPE_SEV_SNP_GUEST);
+}
+
 bool
 sev_es_enabled(void)
 {
     ConfidentialGuestSupport *cgs = MACHINE(qdev_get_machine())->cgs;
 
-    return sev_enabled() && (SEV_GUEST(cgs)->policy & SEV_POLICY_ES);
+    return sev_snp_enabled() ||
+            (sev_enabled() && SEV_GUEST(cgs)->policy & SEV_POLICY_ES);
 }
 
 uint32_t
@@ -954,7 +963,9 @@ static int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
                        "support", __func__);
             goto err;
         }
+    }
 
+    if (sev_es_enabled() && !sev_snp_enabled()) {
         if (!(status.flags & SEV_STATUS_FLAGS_CONFIG_ES)) {
             error_setg(errp, "%s: guest policy requires SEV-ES, but "
                          "host SEV-ES support unavailable",
diff --git a/target/i386/sev.h b/target/i386/sev.h
index bedc667eeb..94295ee74f 100644
--- a/target/i386/sev.h
+++ b/target/i386/sev.h
@@ -45,9 +45,11 @@ typedef struct SevKernelLoaderContext {
 #ifdef CONFIG_SEV
 bool sev_enabled(void);
 bool sev_es_enabled(void);
+bool sev_snp_enabled(void);
 #else
 #define sev_enabled() 0
 #define sev_es_enabled() 0
+#define sev_snp_enabled() 0
 #endif
 
 uint32_t sev_get_cbit_position(void);
-- 
2.34.1