[RFC PATCH 4/6] i386/sev: add the SNP launch start context

[Brijesh Singh <brijesh.singh@amd.com>]

The SNP_LAUNCH_START is called first to create a cryptographic launch
context within the firmware.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 target/i386/sev.c        | 30 +++++++++++++++++++++++++++++-
 target/i386/trace-events |  1 +
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 84ae244af0..259408a8f1 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -812,6 +812,29 @@ sev_read_file_base64(const char *filename, guchar **data, gsize *len)
     return 0;
 }
 
+static int
+sev_snp_launch_start(SevGuestState *sev)
+{
+    int ret = 1;
+    int fw_error, rc;
+    struct kvm_sev_snp_launch_start *start = &sev->snp_config.start;
+
+    trace_kvm_sev_snp_launch_start(start->policy);
+
+    rc = sev_ioctl(sev->sev_fd, KVM_SEV_SNP_LAUNCH_START, start, &fw_error);
+    if (rc < 0) {
+        error_report("%s: SNP_LAUNCH_START ret=%d fw_error=%d '%s'",
+                __func__, ret, fw_error, fw_error_to_str(fw_error));
+        goto out;
+    }
+
+    sev_set_guest_state(sev, SEV_STATE_LAUNCH_UPDATE);
+    ret = 0;
+
+out:
+    return ret;
+}
+
 static int
 sev_launch_start(SevGuestState *sev)
 {
@@ -1105,7 +1128,12 @@ int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
         goto err;
     }
 
-    ret = sev_launch_start(sev);
+    if (sev_snp_enabled()) {
+        ret = sev_snp_launch_start(sev);
+    } else {
+        ret = sev_launch_start(sev);
+    }
+
     if (ret) {
         error_setg(errp, "%s: failed to create encryption context", __func__);
         goto err;
diff --git a/target/i386/trace-events b/target/i386/trace-events
index 2cd8726eeb..18cc14b956 100644
--- a/target/i386/trace-events
+++ b/target/i386/trace-events
@@ -11,3 +11,4 @@ kvm_sev_launch_measurement(const char *value) "data %s"
 kvm_sev_launch_finish(void) ""
 kvm_sev_launch_secret(uint64_t hpa, uint64_t hva, uint64_t secret, int len) "hpa 0x%" PRIx64 " hva 0x%" PRIx64 " data 0x%" PRIx64 " len %d"
 kvm_sev_attestation_report(const char *mnonce, const char *data) "mnonce %s data %s"
+kvm_sev_snp_launch_start(uint64_t policy) "policy 0x%" PRIx64
-- 
2.17.1