2009-02-01 17:35:53 +00:00
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Running gPXE within qemu
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========================
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2006-08-24 13:55:43 +00:00
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Michael Brown <mbrown@fensystems.co.uk>
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To get qemu running is fairly simple:
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1. Build the utilities in this directory:
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make
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2. Get the qemu source code:
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2009-02-01 17:35:53 +00:00
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svn co svn://svn.savannah.nongnu.org/qemu/trunk qemu
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2006-08-24 13:55:43 +00:00
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2006-08-28 01:58:52 +00:00
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2a. Patch the qemu code. There is currently a bug that causes qemu to
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2009-02-01 17:35:53 +00:00
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execute gPXE incredibly slowly. The bug seems to be related
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2006-08-28 01:58:52 +00:00
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to the relative prioritisation of CPU and I/O operations within
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qemu. This patch (which I found via Google) isn't a proper fix,
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but it does work around the problem:
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patch -p0 < qemu-patch
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2006-08-24 13:55:43 +00:00
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3. Configure qemu with
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pushd qemu
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2009-02-01 17:35:53 +00:00
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./configure --target-list=i386-softmmu,x86_64-softmmu
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2006-08-24 13:55:43 +00:00
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popd
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4. Build qemu:
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make -C qemu
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5. As root, set up a TAP virtual network device:
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/sbin/modprobe tun
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chmod o+rw /dev/net/tun
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./tunctl -u <username> -t tap0
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/sbin/ifconfig tap0 up 10.254.254.2 netmask 255.255.255.0
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6. As root, add the following fragment to /etc/dhcpd.conf:
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subnet 10.254.254.0 netmask 255.255.255.252 {
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range dynamic-bootp 10.254.254.1 10.254.254.1;
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}
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You will also need to add in any of your usual declarations for
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2009-02-01 17:35:53 +00:00
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gPXE, e.g. 'filename "vmlinuz.ltsp";'. Note that this setup
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2006-08-24 13:55:43 +00:00
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assumes that your DHCP server, TFTP server etc. all live on the
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machine you are using for running qemu. If not, then you're on
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your own.
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7. As root, restart dhcpd
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/etc/init.d/dhcpd restart
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2009-02-01 17:35:53 +00:00
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8. Build gPXE floppy disk images and pad to 1.44MB
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2006-08-24 13:55:43 +00:00
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pushd ../../src
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2007-07-05 22:37:17 +00:00
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make bin/rtl8139.pdsk
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2006-08-24 13:55:43 +00:00
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popd
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9. Start qemu
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./qemu/i386-softmmu/qemu -L qemu/pc-bios \
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-net nic,model=rtl8139 -net tap,ifname=tap0 \
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2007-07-05 22:37:17 +00:00
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-boot a -fda ../../src/bin/rtl8139.pdsk
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2006-08-24 13:55:43 +00:00
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2009-02-01 17:35:53 +00:00
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You should see qemu start up, load up gPXE and attempt to boot from
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the network.
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2006-08-24 13:55:43 +00:00
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Serial console
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==============
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You can use the program "serial-console" to obtain a virtual serial
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2009-02-01 17:35:53 +00:00
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console for gPXE running within qemu. Run "./serial-console" on a
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spare tty (e.g. a separate xterm window) before starting qemu, and
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2006-08-24 13:55:43 +00:00
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ensure that you have enabled CONSOLE_SERIAL in config.h.
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When serial-console starts, it will print out the message "Slave pty
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is /dev/pts/XX", where XX is a number. You need to append the option
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-serial /dev/pts/XX
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to the qemu command line.
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There is a manual page for "serial-console"; use "man
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./serial-console.1" to view it.
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