[libvirt] [PATCHv3 1/2] bhyve: Support /domain/bootloader configuration for non-FreeBSD guests.
Conrad Meyer
cse.cem at gmail.com
Fri Oct 24 20:28:14 UTC 2014
We still default to bhyveloader(1) if no explicit bootloader
configuration is supplied in the domain.
If the /domain/bootloader looks like grub-bhyve and the user doesn't
supply /domain/bootloader_args, we make an intelligent guess and try
chainloading the first partition on the disk (or a CD if one exists).
Caveat: Assumes the HDD boots from the msdos1 partition. I think this is
a pretty reasonable assumption for a VM. (DrvBhyve with Bhyveload
already assumes that the first disk should be booted.)
I've tested the HDD boot and it seems to work.
Sponsored by: EMC / Isilon storage division
Signed-off-by: Conrad Meyer <conrad.meyer at isilon.com>
---
docs/drvbhyve.html.in | 28 ++++++-
docs/formatdomain.html.in | 4 +-
po/libvirt.pot | 4 +
src/bhyve/bhyve_command.c | 204 ++++++++++++++++++++++++++++++++++++++++++----
src/bhyve/bhyve_driver.c | 5 ++
src/bhyve/bhyve_process.c | 5 ++
src/bhyve/bhyve_utils.h | 1 +
7 files changed, 228 insertions(+), 23 deletions(-)
diff --git a/docs/drvbhyve.html.in b/docs/drvbhyve.html.in
index 39afdf5..6e85800 100644
--- a/docs/drvbhyve.html.in
+++ b/docs/drvbhyve.html.in
@@ -37,8 +37,7 @@ bhyve+ssh://root@example.com/system (remote access, SSH tunnelled)
<h3>Example config</h3>
<p>
The bhyve driver in libvirt is in its early stage and under active development. So it supports
-only limited number of features bhyve provides. All the supported features could be found
-in this sample domain XML.
+only limited number of features bhyve provides.
</p>
<p>
@@ -50,8 +49,8 @@ up to 31 PCI devices.
<pre>
<domain type='bhyve'>
- <name>bhyve</name>
- <uuid>df3be7e7-a104-11e3-aeb0-50e5492bd3dc</uuid>
+ <name>bhyve</name>
+ <uuid>df3be7e7-a104-11e3-aeb0-50e5492bd3dc</uuid>
<memory>219136</memory>
<currentMemory>219136</currentMemory>
<vcpu>1</vcpu>
@@ -157,5 +156,26 @@ An example of domain XML device entry for that will look like:</p>
<p>Please refer to the <a href="storage.html">Storage documentation</a> for more details on storage
management.</p>
+<h3><a name="grubbhyve">Using grub2-bhyve or Alternative Bootloaders</a></h3>
+
+<p>It's possible to boot non-FreeBSD guests by specifying an explicit
+bootloader, e.g. <code>grub-bhyve(1)</code>. Arguments to the bootloader may be
+specified as well. If no arguments are given and bootloader is
+<code>grub-bhyve</code>, libvirt will try and boot from the first partition of
+the disk image.</p>
+
+<pre>
+ ...
+ <bootloader>/usr/local/sbin/grub-bhyve</bootloader>
+ <bootloader_args>...</bootloader_args>
+ ...
+</pre>
+
+<p>(Of course, to install from a CD a user will have to supply explicit
+arguments to <code>grub-bhyve</code>.)</p>
+
+<p>Caveat: <code>bootloader_args</code> does not support any quoting.
+Filenames, etc, must not have spaces or they will be tokenized incorrectly.</p>
+
</body>
</html>
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 0099ce7..b7b6c46 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -217,7 +217,9 @@
a BIOS, and instead the host is responsible to kicking off the
operating system boot. This may use a pseudo-bootloader in the
host to provide an interface to choose a kernel for the guest.
- An example is <code>pygrub</code> with Xen.
+ An example is <code>pygrub</code> with Xen. The Bhyve hypervisor
+ also uses a host bootloader, either <code>bhyveload</code> or
+ <code>grub-bhyve</code>.
</p>
<pre>
diff --git a/po/libvirt.pot b/po/libvirt.pot
index 0b44ad7..d8c9a4d 100644
--- a/po/libvirt.pot
+++ b/po/libvirt.pot
@@ -851,6 +851,10 @@ msgstr ""
msgid "domain should have at least one disk defined"
msgstr ""
+#: src/bhyve/bhyve_command.c:407
+msgid "Custom loader requires explicit %s configuration"
+msgstr ""
+
#: src/bhyve/bhyve_device.c:50
msgid "PCI bus 0 slot 1 is reserved for the implicit LPC PCI-ISA bridge"
msgstr ""
diff --git a/src/bhyve/bhyve_command.c b/src/bhyve/bhyve_command.c
index bea4a59..fcaf077 100644
--- a/src/bhyve/bhyve_command.c
+++ b/src/bhyve/bhyve_command.c
@@ -26,6 +26,7 @@
#include <net/if_tap.h>
#include "bhyve_command.h"
+#include "datatypes.h"
#include "viralloc.h"
#include "virfile.h"
#include "virstring.h"
@@ -294,51 +295,218 @@ virBhyveProcessBuildDestroyCmd(bhyveConnPtr driver ATTRIBUTE_UNUSED,
return cmd;
}
-virCommandPtr
-virBhyveProcessBuildLoadCmd(virConnectPtr conn,
- virDomainDefPtr def)
+static virCommandPtr
+virBhyveProcessBuildBhyveloadCmd(virDomainDefPtr def, virDomainDiskDefPtr disk)
{
virCommandPtr cmd;
- virDomainDiskDefPtr disk;
+ char **blargs;
- if (def->ndisks < 1) {
- virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
- _("domain should have at least one disk defined"));
+ cmd = virCommandNew(BHYVELOAD);
+
+ if (def->os.bootloaderArgs == NULL) {
+ VIR_DEBUG("%s: bhyveload with default arguments", __func__);
+
+ /* Memory (MB) */
+ virCommandAddArg(cmd, "-m");
+ virCommandAddArgFormat(cmd, "%llu",
+ VIR_DIV_UP(def->mem.max_balloon, 1024));
+
+ /* Image path */
+ virCommandAddArg(cmd, "-d");
+ virCommandAddArg(cmd, virDomainDiskGetSource(disk));
+
+ /* VM name */
+ virCommandAddArg(cmd, def->name);
+ } else {
+ /* XXX: Handle quoted? */
+ blargs = virStringSplit(def->os.bootloaderArgs, " ", 0);
+ virCommandAddArgSet(cmd, (const char * const *)blargs);
+ virStringFreeList(blargs);
+ }
+
+ return cmd;
+}
+
+static virCommandPtr
+virBhyveProcessBuildCustomLoaderCmd(virDomainDefPtr def)
+{
+ virCommandPtr cmd;
+ char **blargs;
+
+ if (def->os.bootloaderArgs == NULL) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Custom loader requires explicit %s configuration"),
+ "bootloader_args");
return NULL;
}
- disk = def->disks[0];
+ cmd = virCommandNew(def->os.bootloader);
+
+ VIR_DEBUG("%s: custom loader '%s' with arguments", __func__,
+ def->os.bootloader);
+
+ /* XXX: Handle quoted? */
+ blargs = virStringSplit(def->os.bootloaderArgs, " ", 0);
+ virCommandAddArgSet(cmd, (const char * const *)blargs);
+ virStringFreeList(blargs);
+
+ return cmd;
+}
+
+static bool
+virBhyveUsableDisk(virConnectPtr conn, virDomainDiskDefPtr disk)
+{
if (virStorageTranslateDiskSourcePool(conn, disk) < 0)
- return NULL;
+ return false;
if ((disk->device != VIR_DOMAIN_DISK_DEVICE_DISK) &&
(disk->device != VIR_DOMAIN_DISK_DEVICE_CDROM)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("unsupported disk device"));
- return NULL;
+ return false;
}
if ((virDomainDiskGetType(disk) != VIR_STORAGE_TYPE_FILE) &&
(virDomainDiskGetType(disk) != VIR_STORAGE_TYPE_VOLUME)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("unsupported disk type"));
- return NULL;
+ return false;
}
- cmd = virCommandNew(BHYVELOAD);
+ return true;
+}
- /* Memory */
- virCommandAddArg(cmd, "-m");
+static virCommandPtr
+virBhyveProcessBuildGrubbhyveCmd(virDomainDefPtr def, virConnectPtr conn)
+{
+ bhyveConnPtr privconn = conn->privateData;
+ virDomainDiskDefPtr disk, cd;
+ virCommandPtr cmd;
+ size_t i;
+ FILE *f;
+ int rc;
+
+ if (def->os.bootloaderArgs != NULL)
+ return virBhyveProcessBuildCustomLoaderCmd(def);
+
+ /* Search disk list for CD or HDD device. */
+ cd = disk = NULL;
+ for (i = 0; i < def->ndisks; i++) {
+ if (!virBhyveUsableDisk(conn, def->disks[i]))
+ continue;
+
+ if (cd == NULL &&
+ def->disks[i]->device == VIR_DOMAIN_DISK_DEVICE_CDROM) {
+ cd = def->disks[i];
+ VIR_INFO("%s: Picking %s as boot CD", __func__,
+ virDomainDiskGetSource(cd));
+ }
+
+ if (disk == NULL &&
+ def->disks[i]->device == VIR_DOMAIN_DISK_DEVICE_DISK) {
+ disk = def->disks[i];
+ VIR_INFO("%s: Picking %s as HDD", __func__,
+ virDomainDiskGetSource(disk));
+ }
+ }
+
+ cmd = virCommandNew(def->os.bootloader);
+
+ VIR_DEBUG("%s: grub-bhyve with default arguments", __func__);
+
+ /*
+ * XXX Default grub-bhyve has some minor caveats, but MAY work for some
+ * typical configurations. In particular:
+ *
+ * - For HDD boot, assumes a GRUB install on hd0,msdos1
+ */
+
+ VIR_FREE(privconn->grub_devicesmap_file);
+ rc = virAsprintf(&privconn->grub_devicesmap_file,
+ "%s/grub-bhyve-device.map_%ju", BHYVE_STATE_DIR,
+ (uintmax_t)getpid());
+ if (rc < 0)
+ goto error;
+
+ f = fopen(privconn->grub_devicesmap_file, "wb");
+ if (f == NULL) {
+ virReportSystemError(errno, _("Failed to open '%s'"),
+ privconn->grub_devicesmap_file);
+ goto error;
+ }
+
+ /* Grub device.map (just for boot) */
+ if (disk)
+ fprintf(f, "(hd0) %s\n", virDomainDiskGetSource(disk));
+
+ if (cd != NULL) {
+ fprintf(f, "(cd) %s\n", virDomainDiskGetSource(cd));
+
+ VIR_WARN("Trying to boot cd with grub-bhyve. If this is "
+ "not what you wanted, specify <bootloader_args>.");
+
+ virCommandAddArg(cmd, "--root");
+ virCommandAddArg(cmd, "cd");
+ } else {
+ VIR_WARN("Trying to boot hd0,msdos1 with grub-bhyve. If this is "
+ "not what you wanted, specify <bootloader_args>.");
+
+ virCommandAddArg(cmd, "--root");
+ virCommandAddArg(cmd, "hd0,msdos1");
+ }
+
+ if (VIR_FCLOSE(f) < 0) {
+ virReportSystemError(errno, "%s", _("failed to close file"));
+ goto error;
+ }
+
+ virCommandAddArg(cmd, "--device-map");
+ virCommandAddArg(cmd, privconn->grub_devicesmap_file);
+
+ /* Memory in MB */
+ virCommandAddArg(cmd, "--memory");
virCommandAddArgFormat(cmd, "%llu",
VIR_DIV_UP(def->mem.max_balloon, 1024));
- /* Image path */
- virCommandAddArg(cmd, "-d");
- virCommandAddArg(cmd, virDomainDiskGetSource(disk));
-
/* VM name */
virCommandAddArg(cmd, def->name);
return cmd;
+
+ error:
+ virCommandFree(cmd);
+ return NULL;
+}
+
+virCommandPtr
+virBhyveProcessBuildLoadCmd(virConnectPtr conn,
+ virDomainDefPtr def)
+{
+ virDomainDiskDefPtr disk;
+
+ if (def->ndisks < 1) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("domain should have at least one disk defined"));
+ return NULL;
+ }
+
+ if (def->os.bootloader == NULL) {
+ disk = def->disks[0];
+
+ if (!virBhyveUsableDisk(conn, disk))
+ return NULL;
+
+ if (def->ndisks > 1) {
+ VIR_WARN("%s: drvbhyve attempting to boot from device %s of multiple-"
+ "device configuration", __func__,
+ virDomainDiskGetSource(disk));
+ }
+
+ return virBhyveProcessBuildBhyveloadCmd(def, disk);
+ } else if (strstr(def->os.bootloader, "grub-bhyve") != NULL) {
+ return virBhyveProcessBuildGrubbhyveCmd(def, conn);
+ } else {
+ return virBhyveProcessBuildCustomLoaderCmd(def);
+ }
}
diff --git a/src/bhyve/bhyve_driver.c b/src/bhyve/bhyve_driver.c
index eb0d455..5642f85 100644
--- a/src/bhyve/bhyve_driver.c
+++ b/src/bhyve/bhyve_driver.c
@@ -1128,6 +1128,11 @@ bhyveStateCleanup(void)
if (bhyve_driver == NULL)
return -1;
+ if (bhyve_driver->grub_devicesmap_file != NULL) {
+ ignore_value(unlink(bhyve_driver->grub_devicesmap_file));
+ VIR_FREE(bhyve_driver->grub_devicesmap_file);
+ }
+
virObjectUnref(bhyve_driver->domains);
virObjectUnref(bhyve_driver->caps);
virObjectUnref(bhyve_driver->xmlopt);
diff --git a/src/bhyve/bhyve_process.c b/src/bhyve/bhyve_process.c
index 0bbe388..3689a6a 100644
--- a/src/bhyve/bhyve_process.c
+++ b/src/bhyve/bhyve_process.c
@@ -266,6 +266,11 @@ virBhyveProcessStop(bhyveConnPtr driver,
virPidFileDelete(BHYVE_STATE_DIR, vm->def->name);
virDomainDeleteConfig(BHYVE_STATE_DIR, NULL, vm);
+ if (driver->grub_devicesmap_file != NULL) {
+ ignore_value(unlink(driver->grub_devicesmap_file));
+ VIR_FREE(driver->grub_devicesmap_file);
+ }
+
return ret;
}
diff --git a/src/bhyve/bhyve_utils.h b/src/bhyve/bhyve_utils.h
index 848f9a1..c9c4a2c 100644
--- a/src/bhyve/bhyve_utils.h
+++ b/src/bhyve/bhyve_utils.h
@@ -40,6 +40,7 @@ struct _bhyveConn {
virCapsPtr caps;
virDomainXMLOptionPtr xmlopt;
char *pidfile;
+ char *grub_devicesmap_file;
virSysinfoDefPtr hostsysinfo;
virObjectEventStatePtr domainEventState;
--
1.9.3
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