From 506faaf476efe158dd3226f29460b5e02313f726 Mon Sep 17 00:00:00 2001
From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Date: Sat, 7 Sep 2013 22:32:27 -0400
Subject: enable booting the guest from a local kernel directly

the user in control of a kvm-manager guest can now choose a kernel to
boot directly by placing two files (symlinks are fine) at:

  ~/vms/$VMNAME/kernel
  ~/vms/$VMNAME/initrd

This is by analogy with ~/vms/$VMNAME/cd.iso.

If those two files are present, then the kvm guest will boot directly
to the provided kernel rather than doing BIOS emulation that hands off
control to the MBR of the first emulated disks.

In this case, the first line of the contents of
/etc/sv/kvm/env/CMDLINE will be passed as the kernel parameters, and
no bootloader will be run.
---
 kvm-manager | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/kvm-manager b/kvm-manager
index 7838c04..574737b 100755
--- a/kvm-manager
+++ b/kvm-manager
@@ -35,11 +35,19 @@ up() {
 
     CDISO="$OWNERHOME/vms/$VMNAME/cd.iso"
     NETBOOT="$OWNERHOME/vms/$VMNAME/netboot"
+    KERNEL="$OWNERHOME/vms/$VMNAME/kernel"
+    INITRD="$OWNERHOME/vms/$VMNAME/initrd"
     KVMARGS=
+    unset KERNEL_CMDLINE
     
     BOOTCHOICE=c
 
-    if [ -e "$NETBOOT" ] ; then
+    if [ -e "$KERNEL" -a -e "$INITRD" ] ; then
+	KVMARGS="-kernel $KERNEL -initrd $INITRD"
+        if [ "$CMDLINE" ]; then
+            KERNEL_CMDLINE="$CMDLINE"
+        fi
+    elif [ -e "$NETBOOT" ] ; then
 	BOOTCHOICE=n
     elif [ -e "$CDISO" ] && [ -e $(readlink -f "$CDISO") ] ; then
 	KVMARGS="-cdrom $CDISO"
@@ -88,6 +96,7 @@ EOF
     chpst -u "$OWNER:$OWNERGROUP:kvm" \
         /usr/bin/kvm $KVMARGS \
         -M "${MACHINE:-pc}" \
+	${KERNEL_CMDLINE:+-append "$KERNEL_CMDLINE"} \
         -enable-kvm \
         -nodefaults \
         -nographic \
-- 
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