[libvirt PATCH 3/5] qemu: filter firmware selection based on loader type

[Daniel P. Berrangé]

If the '<loader>' type attribute is set, then use this to filter
the available firmware files. This allows forcing use of a firmware
with or without NVRAM, where both options are available. This will
be used for AMD SEV when doing a measured boot, where NVRAM must
be forbidden.

Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
 src/qemu/qemu_firmware.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/qemu/qemu_firmware.c b/src/qemu/qemu_firmware.c
index 84c80eaacb..2c3b28ae13 100644
--- a/src/qemu/qemu_firmware.c
+++ b/src/qemu/qemu_firmware.c
@@ -1070,6 +1070,31 @@ qemuFirmwareMatchDomain(const virDomainDef *def,
         return false;
     }
 
+    if (def->os.loader) {
+        VIR_DEBUG("Check loader type '%s' match for device '%s'",
+                  virDomainLoaderTypeToString(def->os.loader->type),
+                  qemuFirmwareDeviceTypeToString(fw->mapping.device));
+        switch (def->os.loader->type) {
+        case VIR_DOMAIN_LOADER_TYPE_NONE:
+            break;
+
+        case VIR_DOMAIN_LOADER_TYPE_ROM:
+            if (fw->mapping.device != QEMU_FIRMWARE_DEVICE_MEMORY)
+                return false;
+            break;
+
+        case VIR_DOMAIN_LOADER_TYPE_PFLASH:
+            if (fw->mapping.device != QEMU_FIRMWARE_DEVICE_FLASH)
+                return false;
+            break;
+
+        case VIR_DOMAIN_LOADER_TYPE_LAST:
+            break;
+        }
+    } else {
+        VIR_DEBUG("Skip loader type match");
+    }
+
     if (def->sec) {
         switch ((virDomainLaunchSecurity) def->sec->sectype) {
         case VIR_DOMAIN_LAUNCH_SECURITY_SEV:
-- 
2.33.1