From 8745c3d7c9610dca2874df6ae924e680bb88d17c Mon Sep 17 00:00:00 2001
From: Guido Trotter <ultrotter@google.com>
Date: Mon, 9 Feb 2009 15:16:59 +0000
Subject: [PATCH] KVM: allow netboot
With this patch we allow KVM instances to be booted off the network.
The only issue is that this is not compatible with virtio nics, so
we disallow them, when booting from the net.
Reviewed-by: iustinp
---
lib/hypervisor/hv_kvm.py | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/lib/hypervisor/hv_kvm.py b/lib/hypervisor/hv_kvm.py
index 24c271d56..df83538e2 100644
--- a/lib/hypervisor/hv_kvm.py
+++ b/lib/hypervisor/hv_kvm.py
@@ -236,6 +236,10 @@ class KVMHypervisor(hv_base.BaseHypervisor):
boot_disk = (instance.hvparams[constants.HV_BOOT_ORDER] == "disk")
boot_cdrom = (instance.hvparams[constants.HV_BOOT_ORDER] == "cdrom")
+ boot_network = (instance.hvparams[constants.HV_BOOT_ORDER] == "network")
+
+ if boot_network:
+ kvm_cmd.extend(['-boot', 'n'])
disk_type = instance.hvparams[constants.HV_DISK_TYPE]
if disk_type == constants.HT_DISK_PARAVIRTUAL:
@@ -250,6 +254,7 @@ class KVMHypervisor(hv_base.BaseHypervisor):
if boot_disk:
kvm_cmd.extend(['-boot', 'c'])
boot_val = ',boot=on'
+ # We only boot from the first disk
boot_disk = False
else:
boot_val = ''
@@ -755,8 +760,9 @@ class KVMHypervisor(hv_base.BaseHypervisor):
" an absolute path, if defined")
boot_order = hvparams[constants.HV_BOOT_ORDER]
- if boot_order not in ('cdrom', 'disk'):
- raise errors.HypervisorError("The boot order must be 'cdrom' or 'disk'")
+ if boot_order not in ('cdrom', 'disk', 'network'):
+ raise errors.HypervisorError("The boot order must be 'cdrom', 'disk' or"
+ " 'network'")
if boot_order == 'cdrom' and not iso_path:
raise errors.HypervisorError("Cannot boot from cdrom without an ISO path")
@@ -767,6 +773,9 @@ class KVMHypervisor(hv_base.BaseHypervisor):
" hypervisor. Please choose one of: %s" %
(nic_type,
constants.HT_KVM_VALID_NIC_TYPES))
+ elif boot_order == 'network' and nic_type == constants.HT_NIC_PARAVIRTUAL:
+ raise errors.HypervisorError("Cannot boot from a paravirtual NIC. Please"
+ " change the nic type.")
disk_type = hvparams[constants.HV_DISK_TYPE]
if disk_type not in constants.HT_KVM_VALID_DISK_TYPES:
--
GitLab