libvirt/0011-qemu-Implement-extended-loader-and-nvram.patch

From b1a7618b73c8463dba00e6afe252b6c05fa3d89c Mon Sep 17 00:00:00 2001
From: Michal Privoznik <mprivozn@redhat.com>
Date: Thu, 7 Aug 2014 13:50:00 +0200
Subject: [PATCH] qemu: Implement extended loader and nvram

QEMU now supports UEFI with the following command line:

  -drive file=/usr/share/OVMF/OVMF_CODE.fd,if=pflash,format=raw,unit=0,readonly=on \
  -drive file=/usr/share/OVMF/OVMF_VARS.fd,if=pflash,format=raw,unit=1 \

where the first line reflects <loader> and the second one <nvram>.
Moreover, these two lines obsolete the -bios argument.

Note that UEFI is unusable without ACPI. This is handled properly now.
Among with this extension, the variable file is expected to be
writable and hence we need security drivers to label it.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit 542899168c382610dbad9a597d27ef3d7c699f68)
---
 src/qemu/qemu_command.c                            | 94 +++++++++++++++++++++-
 src/security/security_dac.c                        |  8 ++
 src/security/security_selinux.c                    |  8 ++
 .../qemuxml2argvdata/qemuxml2argv-bios-nvram.args  | 10 +++
 tests/qemuxml2argvtest.c                           |  2 +
 5 files changed, 118 insertions(+), 4 deletions(-)
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-bios-nvram.args

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 3cb2e0b..718533b 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7370,6 +7370,94 @@ qemuBuildChrDeviceCommandLine(virCommandPtr cmd,
     return 0;
 }
 
+static int
+qemuBuildDomainLoaderCommandLine(virCommandPtr cmd,
+                                 virDomainDefPtr def,
+                                 virQEMUCapsPtr qemuCaps)
+{
+    int ret = -1;
+    virDomainLoaderDefPtr loader = def->os.loader;
+    virBuffer buf = VIR_BUFFER_INITIALIZER;
+    int unit = 0;
+
+    if (!loader)
+        return 0;
+
+    switch ((virDomainLoader) loader->type) {
+    case VIR_DOMAIN_LOADER_TYPE_ROM:
+        virCommandAddArg(cmd, "-bios");
+        virCommandAddArg(cmd, loader->path);
+        break;
+
+    case VIR_DOMAIN_LOADER_TYPE_PFLASH:
+        /* UEFI is supported only for x86_64 currently */
+        if (def->os.arch != VIR_ARCH_X86_64) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("pflash is not supported for %s guest architecture"),
+                           virArchToString(def->os.arch));
+            goto cleanup;
+        }
+
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DRIVE)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("this QEMU binary doesn't support -drive"));
+            goto cleanup;
+        }
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DRIVE_FORMAT)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("this QEMU binary doesn't support passing "
+                             "drive format"));
+            goto cleanup;
+        }
+        if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NO_ACPI) &&
+            def->features[VIR_DOMAIN_FEATURE_ACPI] != VIR_TRISTATE_SWITCH_ON) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("ACPI must be enabled in order to use UEFI"));
+            goto cleanup;
+        }
+
+        virBufferAsprintf(&buf,
+                          "file=%s,if=pflash,format=raw,unit=%d",
+                          loader->path, unit);
+        unit++;
+
+        if (loader->readonly) {
+            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DRIVE_READONLY)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("this qemu doesn't support passing "
+                                 "readonly attribute"));
+                goto cleanup;
+            }
+
+            virBufferAsprintf(&buf, ",readonly=%s",
+                              virTristateSwitchTypeToString(loader->readonly));
+        }
+
+        virCommandAddArg(cmd, "-drive");
+        virCommandAddArgBuffer(cmd, &buf);
+
+        if (loader->nvram) {
+            virBufferFreeAndReset(&buf);
+            virBufferAsprintf(&buf,
+                              "file=%s,if=pflash,format=raw,unit=%d",
+                              loader->nvram, unit);
+
+            virCommandAddArg(cmd, "-drive");
+            virCommandAddArgBuffer(cmd, &buf);
+        }
+        break;
+
+    case VIR_DOMAIN_LOADER_TYPE_LAST:
+        /* nada */
+        break;
+    }
+
+    ret = 0;
+ cleanup:
+    virBufferFreeAndReset(&buf);
+    return ret;
+}
+
 qemuBuildCommandLineCallbacks buildCommandLineCallbacks = {
     .qemuGetSCSIDeviceSgName = virSCSIDeviceGetSgName,
 };
@@ -7525,10 +7613,8 @@ qemuBuildCommandLine(virConnectPtr conn,
             virCommandAddArg(cmd, "-enable-nesting");
     }
 
-    if (def->os.loader) {
-        virCommandAddArg(cmd, "-bios");
-        virCommandAddArg(cmd, def->os.loader->path);
-    }
+    if (qemuBuildDomainLoaderCommandLine(cmd, def, qemuCaps) < 0)
+        goto error;
 
     /* Set '-m MB' based on maxmem, because the lower 'memory' limit
      * is set post-startup using the balloon driver. If balloon driver
diff --git a/src/security/security_dac.c b/src/security/security_dac.c
index e62828e..e398d2c 100644
--- a/src/security/security_dac.c
+++ b/src/security/security_dac.c
@@ -960,6 +960,10 @@ virSecurityDACRestoreSecurityAllLabel(virSecurityManagerPtr mgr,
             rc = -1;
     }
 
+    if (def->os.loader && def->os.loader->nvram &&
+        virSecurityDACRestoreSecurityFileLabel(def->os.loader->nvram) < 0)
+        rc = -1;
+
     if (def->os.kernel &&
         virSecurityDACRestoreSecurityFileLabel(def->os.kernel) < 0)
         rc = -1;
@@ -1036,6 +1040,10 @@ virSecurityDACSetSecurityAllLabel(virSecurityManagerPtr mgr,
     if (virSecurityDACGetImageIds(secdef, priv, &user, &group))
         return -1;
 
+    if (def->os.loader && def->os.loader->nvram &&
+        virSecurityDACSetOwnership(def->os.loader->nvram, user, group) < 0)
+        return -1;
+
     if (def->os.kernel &&
         virSecurityDACSetOwnership(def->os.kernel, user, group) < 0)
         return -1;
diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
index c078cab..a409c19 100644
--- a/src/security/security_selinux.c
+++ b/src/security/security_selinux.c
@@ -1911,6 +1911,10 @@ virSecuritySELinuxRestoreSecurityAllLabel(virSecurityManagerPtr mgr,
                                      mgr) < 0)
         rc = -1;
 
+    if (def->os.loader && def->os.loader->nvram &&
+        virSecuritySELinuxRestoreSecurityFileLabel(mgr, def->os.loader->nvram) < 0)
+        rc = -1;
+
     if (def->os.kernel &&
         virSecuritySELinuxRestoreSecurityFileLabel(mgr, def->os.kernel) < 0)
         rc = -1;
@@ -2294,6 +2298,10 @@ virSecuritySELinuxSetSecurityAllLabel(virSecurityManagerPtr mgr,
                                      mgr) < 0)
         return -1;
 
+    if (def->os.loader && def->os.loader->nvram &&
+        virSecuritySELinuxSetFilecon(def->os.loader->nvram, data->content_context) < 0)
+        return -1;
+
     if (def->os.kernel &&
         virSecuritySELinuxSetFilecon(def->os.kernel, data->content_context) < 0)
         return -1;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-bios-nvram.args b/tests/qemuxml2argvdata/qemuxml2argv-bios-nvram.args
new file mode 100644
index 0000000..b51e8f3
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-bios-nvram.args
@@ -0,0 +1,10 @@
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/usr/bin/qemu -S -M pc \
+-drive file=/usr/share/OVMF/OVMF_CODE.fd,if=pflash,format=raw,unit=0,readonly=on \
+-drive file=/usr/share/OVMF/OVMF_VARS.fd,if=pflash,format=raw,unit=1 \
+-m 1024 -smp 1 -nographic -nodefaults \
+-monitor unix:/tmp/test-monitor,server,nowait -boot c -usb \
+-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-ide0-0-0,format=raw \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
+-serial pty -device usb-tablet,id=input0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 3feb2fe..5c28253 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -642,6 +642,8 @@ mymain(void)
     DO_TEST_FAILURE("reboot-timeout-enabled", NONE);
 
     DO_TEST("bios", QEMU_CAPS_DEVICE, QEMU_CAPS_SGA);
+    DO_TEST("bios-nvram", QEMU_CAPS_DEVICE, QEMU_CAPS_DRIVE,
+            QEMU_CAPS_DRIVE_FORMAT, QEMU_CAPS_DRIVE_READONLY);
     DO_TEST("clock-utc", QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_DEVICE);
     DO_TEST("clock-localtime", NONE);
     DO_TEST("clock-localtime-basis-localtime", QEMU_CAPS_RTC);