commit 6fd4c8f8785a063112c8161a3a3f5ad3cb6647ea
Author: Erik Skultety <eskultet@redhat.com>
Date:   Tue Jan 22 13:46:16 2019 +0100

    qemu: domain: Add /dev/sev into the domain mount namespace selectively
    
    Instead of exposing /dev/sev to every domain, do it selectively.
    
    Signed-off-by: Erik Skultety <eskultet@redhat.com>
    Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

Index: libvirt-5.0.0/src/qemu/qemu_domain.c
===================================================================
--- libvirt-5.0.0.orig/src/qemu/qemu_domain.c
+++ libvirt-5.0.0/src/qemu/qemu_domain.c
@@ -116,6 +116,7 @@ VIR_ENUM_IMPL(qemuDomainNamespace, QEMU_
 #define DEVPREFIX "/dev/"
 #define DEV_VFIO "/dev/vfio/vfio"
 #define DEVICE_MAPPER_CONTROL_PATH "/dev/mapper/control"
+#define DEV_SEV "/dev/sev"
 
 
 struct _qemuDomainLogContext {
@@ -12018,6 +12019,26 @@ qemuDomainSetupLoader(virQEMUDriverConfi
 }
 
 
+static int
+qemuDomainSetupLaunchSecurity(virQEMUDriverConfigPtr cfg ATTRIBUTE_UNUSED,
+                              virDomainObjPtr vm,
+                              const struct qemuDomainCreateDeviceData *data)
+{
+    virDomainSEVDefPtr sev = vm->def->sev;
+
+    if (!sev || sev->sectype != VIR_DOMAIN_LAUNCH_SECURITY_SEV)
+        return 0;
+
+    VIR_DEBUG("Setting up launch security");
+
+    if (qemuDomainCreateDevice(DEV_SEV, data, false) < 0)
+        return -1;
+
+    VIR_DEBUG("Set up launch security");
+    return 0;
+}
+
+
 int
 qemuDomainBuildNamespace(virQEMUDriverConfigPtr cfg,
                          virSecurityManagerPtr mgr,
@@ -12089,6 +12110,9 @@ qemuDomainBuildNamespace(virQEMUDriverCo
     if (qemuDomainSetupLoader(cfg, vm, &data) < 0)
         goto cleanup;
 
+    if (qemuDomainSetupLaunchSecurity(cfg, vm, &data) < 0)
+        goto cleanup;
+
     /* Save some mount points because we want to share them with the host */
     for (i = 0; i < ndevMountsPath; i++) {
         struct stat sb;