[Qemu-devel] [RFC PATCH v4 11/20] sev: add LAUNCH_START command

[Brijesh Singh]

The command is used to bootstrap SEV guest from unencrypted boot images.
The command creates a new VM encryption key (VEK) using guest owner's public
DH certificate, and security policy and session parameters. The encryption
key created during launch start process will be used for encryption the boot
images (such as BIOS).

Signed-off-by: Brijesh Singh <address@hidden>
---
 include/sysemu/sev.h |    1 +
 kvm-all.c            |    1 +
 sev.c                |   55 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+)

diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
index dbc3c6c..747fe87 100644
--- a/include/sysemu/sev.h
+++ b/include/sysemu/sev.h
@@ -86,6 +86,7 @@ typedef struct SEVState SEVState;
 bool sev_enabled(void);
 void *sev_guest_init(const char *keyid);
 void sev_set_debug_ops(void *handle, MemoryRegion *mr);
+int sev_create_launch_context(void *handle);
 
 #endif
 
diff --git a/kvm-all.c b/kvm-all.c
index 1fa6413..a13d62f 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1826,6 +1826,7 @@ static int kvm_init(MachineState *ms)
                 goto err;
             }
             kvm_state->memcrypt_debug_ops = sev_set_debug_ops;
+            kvm_state->create_launch_context = sev_create_launch_context;
             g_free(id);
         }
     }
diff --git a/sev.c b/sev.c
index 3e02453..4b3f39a 100644
--- a/sev.c
+++ b/sev.c
@@ -148,6 +148,55 @@ static const TypeInfo qsev_launch_info = {
 };
 
 static int
+sev_ioctl(int cmd, void *data, int *error)
+{
+    int r;
+    struct kvm_sev_cmd input;
+
+    input.id = cmd;
+    input.sev_fd = sev_fd;
+    input.data = (__u64)data;
+
+    r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &input);
+    *error = input.error;
+    return r;
+}
+
+static int
+sev_launch_start(SEVState *s)
+{
+    int ret = 1;
+    Object *obj;
+    int fw_error;
+    struct kvm_sev_launch_start *start;
+
+    if (!s) {
+        return 1;
+    }
+
+    start = g_malloc0(sizeof(*start));
+    if (!start) {
+        return 1;
+    }
+
+    obj = object_property_get_link(OBJECT(s->sev_info), "launch", 
&error_abort);
+    if (!obj) {
+        goto err;
+    }
+
+    ret = sev_ioctl(KVM_SEV_LAUNCH_START, start, &fw_error);
+    if (ret < 0) {
+        fprintf(stderr, "failed LAUNCH_START %d (%#x)\n", ret, fw_error);
+        goto err;
+    }
+
+    DPRINTF("SEV: LAUNCH_START\n");
+err:
+    g_free(start);
+    return ret;
+}
+
+static int
 sev_mem_write(uint8_t *dst, const uint8_t *src, uint32_t len, MemTxAttrs attrs)
 {
     return 0;
@@ -200,6 +249,12 @@ err:
     return NULL;
 }
 
+int
+sev_create_launch_context(void *handle)
+{
+    return sev_launch_start((SEVState *)handle);
+}
+
 void
 sev_set_debug_ops(void *handle, MemoryRegion *mr)
 {