vmm: add host-data as a command line argument

The host data provided at launch. Data is passed
to the hypervisor during the completion of the
isolated import.

Host Data provided by the hypervisor during guest launch.
The firmware includes this value in all attestation
reports for the guest.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

src/main.rs

@@ -468,6 +468,14 @@ fn create_app(default_vcpus: String, default_memory: String, default_rng: String
             .num_args(1)
             .group("vm-config"),
     );
+    #[cfg(feature = "sev_snp")]
+    let app = app.arg(
+        Arg::new("host-data")
+            .long("host-data")
+            .help("Host specific data to SEV SNP guest")
+            .num_args(1)
+            .group("vm-config"),
+    );
     app.arg(
         Arg::new("version")
             .short('V')
@@ -879,6 +887,8 @@ mod unit_tests {
                 initramfs: None,
                 #[cfg(feature = "igvm")]
                 igvm: None,
+                #[cfg(feature = "sev_snp")]
+                host_data: None,
             }),
             rate_limit_groups: None,
             disks: None,

vmm/src/config.rs

@@ -435,6 +435,8 @@ pub struct VmParams<'a> {
     pub tpm: Option<&'a str>,
     #[cfg(feature = "igvm")]
     pub igvm: Option<&'a str>,
+    #[cfg(feature = "sev_snp")]
+    pub host_data: Option<&'a str>,
 }
 
 impl<'a> VmParams<'a> {
@@ -495,6 +497,8 @@ impl<'a> VmParams<'a> {
         let tpm: Option<&str> = args.get_one::<String>("tpm").map(|x| x as &str);
         #[cfg(feature = "igvm")]
         let igvm = args.get_one::<String>("igvm").map(|x| x as &str);
+        #[cfg(feature = "sev_snp")]
+        let host_data = args.get_one::<String>("host-data").map(|x| x as &str);
         VmParams {
             cpus,
             memory,
@@ -529,6 +533,8 @@ impl<'a> VmParams<'a> {
             tpm,
             #[cfg(feature = "igvm")]
             igvm,
+            #[cfg(feature = "sev_snp")]
+            host_data,
         }
     }
 }
@@ -2558,6 +2564,8 @@ impl VmConfig {
                 firmware: vm_params.firmware.map(PathBuf::from),
                 #[cfg(feature = "igvm")]
                 igvm: vm_params.igvm.map(PathBuf::from),
+                #[cfg(feature = "sev_snp")]
+                host_data: vm_params.host_data.map(|s| s.to_string()),
             })
         } else {
             None
@@ -3452,6 +3460,8 @@ mod tests {
                 initramfs: None,
                 #[cfg(feature = "igvm")]
                 igvm: None,
+                #[cfg(feature = "sev_snp")]
+                host_data: None,
             }),
             rate_limit_groups: None,
             disks: None,

vmm/src/lib.rs

@@ -2084,6 +2084,8 @@ mod unit_tests {
                 initramfs: None,
                 #[cfg(feature = "igvm")]
                 igvm: None,
+                #[cfg(feature = "sev_snp")]
+                host_data: None,
             }),
             rate_limit_groups: None,
             disks: None,

vmm/src/vm_config.rs

@@ -522,6 +522,9 @@ pub struct PayloadConfig {
     #[cfg(feature = "igvm")]
     #[serde(default)]
     pub igvm: Option<PathBuf>,
+    #[cfg(feature = "sev_snp")]
+    #[serde(default)]
+    pub host_data: Option<String>,
 }
 
 pub fn default_serial() -> ConsoleConfig {