[libvirt] [PATCHv8 1/7] bhyve: Support /domain/bootloader configuration for non-FreeBSD guests.
Conrad Meyer
cse.cem at gmail.com
Sat Nov 8 16:48:30 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,
under the assumption that for a VM a CD is likely an install source).
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 both HDD and CD boot and they seem to work.
---
docs/drvbhyve.html.in | 100 +++++++++++++++++++++++++--
docs/formatdomain.html.in | 4 +-
src/bhyve/bhyve_command.c | 173 +++++++++++++++++++++++++++++++++++++++++-----
src/bhyve/bhyve_command.h | 5 +-
src/bhyve/bhyve_driver.c | 3 +-
src/bhyve/bhyve_process.c | 38 +++++++++-
6 files changed, 295 insertions(+), 28 deletions(-)
diff --git a/docs/drvbhyve.html.in b/docs/drvbhyve.html.in
index 39afdf5..bd4b35e 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>
@@ -48,10 +47,21 @@ disk device were supported per-domain. However,
up to 31 PCI devices.
</p>
+<p>
+Note: the Bhyve driver in libvirt will boot whichever device is first. If you
+want to install from CD, put the CD device first. If not, put the root HDD
+first.
+</p>
+
+<p>
+Note: Only the SATA bus is supported. Only <code>cdrom</code>- and
+<code>disk</code>-type disks are supported.
+</p>
+
<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>
@@ -76,6 +86,7 @@ up to 31 PCI devices.
<driver name='file' type='raw'/>
<source file='/path/to/cdrom.iso'/>
<target dev='hdc' bus='sata'/>
+ <readonly/>
</disk>
<interface type='bridge'>
<model type='virtio'/>
@@ -85,6 +96,53 @@ up to 31 PCI devices.
</domain>
</pre>
+<p>(The <disk> sections may be swapped in order to install from
+<em>cdrom.iso</em>.)</p>
+
+<h3>Example config (Linux guest)</h3>
+
+<p>
+Note the addition of <bootloader>.
+</p>
+
+<pre>
+<domain type='bhyve'>
+ <name>linux_guest</name>
+ <uuid>df3be7e7-a104-11e3-aeb0-50e5492bd3dc</uuid>
+ <memory>131072</memory>
+ <currentMemory>131072</currentMemory>
+ <vcpu>1</vcpu>
+ <bootloader>/usr/local/sbin/grub-bhyve</bootloader>
+ <os>
+ <type>hvm</type>
+ </os>
+ <features>
+ <apic/>
+ <acpi/>
+ </features>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <disk type='file' device='disk'>
+ <driver name='file' type='raw'/>
+ <source file='/path/to/guest_hdd.img'/>
+ <target dev='hda' bus='sata'/>
+ </disk>
+ <disk type='file' device='cdrom'>
+ <driver name='file' type='raw'/>
+ <source file='/path/to/cdrom.iso'/>
+ <target dev='hdc' bus='sata'/>
+ <readonly/>
+ </disk>
+ <interface type='bridge'>
+ <model type='virtio'/>
+ <source bridge="virbr0"/>
+ </interface>
+ </devices>
+</domain>
+</pre>
<h2><a name="usage">Guest usage / management</a></h2>
@@ -119,6 +177,20 @@ to let a guest boot or start a guest using:</p>
<pre>start --console domname</pre>
+<p><b>NB:</b> An bootloader configured to require user interaction will prevent
+the domain from starting (and thus <code>virsh console</code> or <code>start
+--console</code> from functioning) until the user interacts with it manually on
+the VM host. Because users typically do not have access to the VM host,
+interactive bootloaders are unsupported by libvirt. <em>However,</em> if you happen to
+run into this scenario and also happen to have access to the Bhyve host
+machine, you may select a boot option and allow the domain to finish starting
+by using an alternative terminal client on the VM host to connect to the
+domain-configured null modem device. One example (assuming
+<code>/dev/nmdm0B</code> is configured as the slave end of the domain serial
+device) is:</p>
+
+<pre>cu -l /dev/nmdm0B</pre>
+
<h3><a name="xmltonative">Converting from domain XML to Bhyve args</a></h3>
<p>
@@ -157,5 +229,25 @@ 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 the bootloader is <code>grub-bhyve</code> and arguments
+are omitted, libvirt will try and boot the first disk in the domain (either
+<code>cdrom</code>- or <code>disk</code>-type devices). If the disk type is
+<code>disk</code>, it will attempt to boot from the first partition in the disk
+image.</p>
+
+<pre>
+ ...
+ <bootloader>/usr/local/sbin/grub-bhyve</bootloader>
+ <bootloader_args>...</bootloader_args>
+ ...
+</pre>
+
+<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 7196e75..45af8cc 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/src/bhyve/bhyve_command.c b/src/bhyve/bhyve_command.c
index bea4a59..203495c 100644
--- a/src/bhyve/bhyve_command.c
+++ b/src/bhyve/bhyve_command.c
@@ -26,6 +26,8 @@
#include <net/if_tap.h>
#include "bhyve_command.h"
+#include "bhyve_domain.h"
+#include "datatypes.h"
#include "viralloc.h"
#include "virfile.h"
#include "virstring.h"
@@ -294,51 +296,186 @@ virBhyveProcessBuildDestroyCmd(bhyveConnPtr driver ATTRIBUTE_UNUSED,
return cmd;
}
-virCommandPtr
-virBhyveProcessBuildLoadCmd(virConnectPtr conn,
- virDomainDefPtr def)
+static void
+virAppendBootloaderArgs(virCommandPtr cmd, virDomainDefPtr def)
+{
+ char **blargs;
+
+ /* XXX: Handle quoted? */
+ blargs = virStringSplit(def->os.bootloaderArgs, " ", 0);
+ virCommandAddArgSet(cmd, (const char * const *)blargs);
+ virStringFreeList(blargs);
+}
+
+static virCommandPtr
+virBhyveProcessBuildBhyveloadCmd(virDomainDefPtr def, virDomainDiskDefPtr disk)
{
virCommandPtr cmd;
- virDomainDiskDefPtr disk;
- 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("bhyveload with default arguments");
+
+ /* 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 {
+ VIR_DEBUG("bhyveload with arguments");
+ virAppendBootloaderArgs(cmd, def);
+ }
+
+ return cmd;
+}
+
+static virCommandPtr
+virBhyveProcessBuildCustomLoaderCmd(virDomainDefPtr def)
+{
+ virCommandPtr cmd;
+
+ if (def->os.bootloaderArgs == NULL) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Custom loader requires explicit %s configuration"),
+ "bootloader_args");
return NULL;
}
- disk = def->disks[0];
+ VIR_DEBUG("custom loader '%s' with arguments", def->os.bootloader);
+
+ cmd = virCommandNew(def->os.bootloader);
+ virAppendBootloaderArgs(cmd, def);
+ 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,
+ const char *devmap_file,
+ char **devicesmap_out)
+{
+ virDomainDiskDefPtr disk, cd;
+ virBuffer devicemap;
+ virCommandPtr cmd;
+ size_t i;
+
+ if (def->os.bootloaderArgs != NULL)
+ return virBhyveProcessBuildCustomLoaderCmd(def);
+
+ devicemap = (virBuffer)VIR_BUFFER_INITIALIZER;
+
+ /* 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("Picking %s as boot CD", virDomainDiskGetSource(cd));
+ }
+
+ if (disk == NULL &&
+ def->disks[i]->device == VIR_DOMAIN_DISK_DEVICE_DISK) {
+ disk = def->disks[i];
+ VIR_INFO("Picking %s as HDD", virDomainDiskGetSource(disk));
+ }
+ }
+
+ cmd = virCommandNew(def->os.bootloader);
+
+ VIR_DEBUG("grub-bhyve with default arguments");
+
+ if (devicesmap_out != NULL) {
+ /* Grub device.map (just for boot) */
+ if (disk != NULL)
+ virBufferAsprintf(&devicemap, "(hd0) %s\n",
+ virDomainDiskGetSource(disk));
+
+ if (cd != NULL)
+ virBufferAsprintf(&devicemap, "(cd) %s\n",
+ virDomainDiskGetSource(cd));
+
+ *devicesmap_out = virBufferContentAndReset(&devicemap);
+ }
+
+ if (cd != NULL) {
+ virCommandAddArg(cmd, "--root");
+ virCommandAddArg(cmd, "cd");
+ } else {
+ virCommandAddArg(cmd, "--root");
+ virCommandAddArg(cmd, "hd0,msdos1");
+ }
+
+ virCommandAddArg(cmd, "--device-map");
+ virCommandAddArg(cmd, devmap_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;
}
+
+virCommandPtr
+virBhyveProcessBuildLoadCmd(virConnectPtr conn, virDomainDefPtr def,
+ const char *devmap_file, char **devicesmap_out)
+{
+ 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;
+
+ return virBhyveProcessBuildBhyveloadCmd(def, disk);
+ } else if (strstr(def->os.bootloader, "grub-bhyve") != NULL) {
+ return virBhyveProcessBuildGrubbhyveCmd(def, conn, devmap_file,
+ devicesmap_out);
+ } else {
+ return virBhyveProcessBuildCustomLoaderCmd(def);
+ }
+}
diff --git a/src/bhyve/bhyve_command.h b/src/bhyve/bhyve_command.h
index 5b323bf..22a959d 100644
--- a/src/bhyve/bhyve_command.h
+++ b/src/bhyve/bhyve_command.h
@@ -22,6 +22,7 @@
#ifndef __BHYVE_COMMAND_H__
# define __BHYVE_COMMAND_H__
+# include "bhyve_domain.h"
# include "bhyve_utils.h"
# include "domain_conf.h"
@@ -38,7 +39,7 @@ virBhyveProcessBuildDestroyCmd(bhyveConnPtr driver,
virDomainDefPtr def);
virCommandPtr
-virBhyveProcessBuildLoadCmd(virConnectPtr conn,
- virDomainDefPtr def);
+virBhyveProcessBuildLoadCmd(virConnectPtr conn, virDomainDefPtr def,
+ const char *devmap_file, char **devicesmap_out);
#endif /* __BHYVE_COMMAND_H__ */
diff --git a/src/bhyve/bhyve_driver.c b/src/bhyve/bhyve_driver.c
index eb0d455..4aee249 100644
--- a/src/bhyve/bhyve_driver.c
+++ b/src/bhyve/bhyve_driver.c
@@ -689,7 +689,8 @@ bhyveConnectDomainXMLToNative(virConnectPtr conn,
if (bhyveDomainAssignAddresses(def, NULL) < 0)
goto cleanup;
- if (!(loadcmd = virBhyveProcessBuildLoadCmd(conn, def)))
+ if (!(loadcmd = virBhyveProcessBuildLoadCmd(conn, def, "<device.map>",
+ NULL)))
goto cleanup;
if (!(cmd = virBhyveProcessBuildBhyveCmd(conn, def, true)))
diff --git a/src/bhyve/bhyve_process.c b/src/bhyve/bhyve_process.c
index 0bbe388..21f8331 100644
--- a/src/bhyve/bhyve_process.c
+++ b/src/bhyve/bhyve_process.c
@@ -88,6 +88,14 @@ bhyveNetCleanup(virDomainObjPtr vm)
}
}
+static int
+virBhyveFormatDevMapFile(const char *vm_name, char **fn_out)
+{
+
+ return virAsprintf(fn_out, "%s/grub_bhyve-%s-device.map", BHYVE_STATE_DIR,
+ vm_name);
+}
+
int
virBhyveProcessStart(virConnectPtr conn,
bhyveConnPtr driver,
@@ -95,6 +103,8 @@ virBhyveProcessStart(virConnectPtr conn,
virDomainRunningReason reason,
unsigned int flags)
{
+ char *devmap_file = NULL;
+ char *devicemap = NULL;
char *logfile = NULL;
int logfd = -1;
off_t pos = -1;
@@ -102,7 +112,7 @@ virBhyveProcessStart(virConnectPtr conn,
virCommandPtr cmd = NULL;
virCommandPtr load_cmd = NULL;
bhyveConnPtr privconn = conn->privateData;
- int ret = -1;
+ int ret = -1, rc;
if (virAsprintf(&logfile, "%s/%s.log",
BHYVE_LOG_DIR, vm->def->name) < 0)
@@ -151,11 +161,26 @@ virBhyveProcessStart(virConnectPtr conn,
/* Now bhyve command is constructed, meaning the
* domain is ready to be started, so we can build
* and execute bhyveload command */
- if (!(load_cmd = virBhyveProcessBuildLoadCmd(conn, vm->def)))
+ rc = virBhyveFormatDevMapFile(vm->def->name, &devmap_file);
+ if (rc < 0)
+ goto cleanup;
+
+ if (!(load_cmd = virBhyveProcessBuildLoadCmd(conn, vm->def, devmap_file,
+ &devicemap)))
goto cleanup;
virCommandSetOutputFD(load_cmd, &logfd);
virCommandSetErrorFD(load_cmd, &logfd);
+ if (devicemap != NULL) {
+ rc = virFileWriteStr(devmap_file, devicemap, 0644);
+ if (rc) {
+ virReportSystemError(errno,
+ _("Cannot write device.map '%s'"),
+ devmap_file);
+ goto cleanup;
+ }
+ }
+
/* Log generated command line */
virCommandWriteArgLog(load_cmd, logfd);
if ((pos = lseek(logfd, 0, SEEK_END)) < 0)
@@ -193,6 +218,15 @@ virBhyveProcessStart(virConnectPtr conn,
ret = 0;
cleanup:
+ if (devicemap != NULL) {
+ rc = unlink(devmap_file);
+ if (rc < 0 && errno != ENOENT)
+ virReportSystemError(errno, _("cannot unlink file '%s'"),
+ devmap_file);
+ VIR_FREE(devicemap);
+ }
+ VIR_FREE(devmap_file);
+
if (ret < 0) {
int exitstatus; /* Needed to avoid logging non-zero status */
virCommandPtr destroy_cmd;
--
1.9.3
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