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Using Upstream QEMU with Xen
============================
Note
----
All these steps will become unnecessary after the patches to integrate
SeaBIOS/QEMU into the Xen build system have been applied.
How to build it
---------------
### SeaBIOS
The new device-model needs a different BIOS, SeaBIOS. Clone the repository from:
- [git://git.qemu.org/seabios.git]()
- [http://git.qemu.org/git/seabios.git]()
Put the `.config` file in the appendix at the root of `seabios.git`
and build SeaBIOS by typing `make`.
In the xen-unstable source tree, add the file `.config` with
`SEABIOS_DIR = /path/to/seabios.git`.
To build hvmloader with SeaBIOS, you probably need to `make -C tools/firmware
clean` first and then `make tools`, to use the new SEABIOS_DIR parameter.
### QEMU
Get QEMU upstream source from:
- [git://xenbits.xensource.com/qemu-upstream-unstable.git]()
- [http://xenbits.xensource.com/git-http/qemu-upstream-unstable.git]()
To configure QEMU upstream with support for Xen:
./configure --enable-xen --target-list=i386-softmmu --extra-cflags="-I$path_to_xen_source/tools/include -I$path_to_xen_source/tools/libxc -I$path_to_xen_source/tools/xenstore" --extra-ldflags="-L$path_to_xen_source/tools/libxc -L$path_to_xen_source/tools/xenstore"
You can also use other several options such as `--disable-kvm`.
How to use QEMU upstream
------------------------
Only `xl` supports QEMU upstream.
To actually use it, add or change this in your VM configuration file:
device_model_version = 'qemu-xen'
device_model_override = '/path/to/qemu/i386-softmmu/qemu'
NB: In the `qemu-upstream` repository, the default binary name has been
renamed to `qemu-system-i386`.
Appendix
------
### `.config` file for SeaBIOS
#
# General Features
#
# CONFIG_COREBOOT is not set
CONFIG_XEN=y
CONFIG_THREADS=y
CONFIG_THREAD_OPTIONROMS=y
CONFIG_RELOCATE_INIT=y
CONFIG_BOOTMENU=y
CONFIG_BOOTMENU_WAIT=1000
# CONFIG_BOOTSPLASH is not set
CONFIG_BOOTORDER=y
#
# Hardware support
#
CONFIG_ATA=y
CONFIG_ATA_DMA=y
CONFIG_ATA_PIO32=y
CONFIG_AHCI=y
CONFIG_VIRTIO_BLK=y
CONFIG_FLOPPY=y
CONFIG_PS2PORT=y
CONFIG_USB=y
CONFIG_USB_UHCI=y
CONFIG_USB_OHCI=y
CONFIG_USB_EHCI=y
CONFIG_USB_MSC=y
CONFIG_USB_HUB=y
CONFIG_USB_KEYBOARD=y
CONFIG_USB_MOUSE=y
CONFIG_SERIAL=y
CONFIG_LPT=y
# CONFIG_EXTRA_PCI_ROOTS is not set
# CONFIG_USE_SMM is not set
CONFIG_MTRR_INIT=y
#
# BIOS interfaces
#
CONFIG_DRIVES=y
# CONFIG_CDROM_BOOT is not set
CONFIG_PCIBIOS=y
CONFIG_APMBIOS=y
CONFIG_PNPBIOS=y
CONFIG_OPTIONROMS=y
# CONFIG_OPTIONROMS_DEPLOYED is not set
CONFIG_OPTIONROMS_CHECKSUM=y
CONFIG_PMM=y
CONFIG_BOOT=y
CONFIG_KEYBOARD=y
CONFIG_KBD_CALL_INT15_4F=y
CONFIG_MOUSE=y
CONFIG_S3_RESUME=y
# CONFIG_S3_RESUME_VGA_INIT is not set
# CONFIG_DISABLE_A20 is not set
#
# BIOS Tables
#
CONFIG_PIRTABLE=y
CONFIG_MPTABLE=y
CONFIG_SMBIOS=y
CONFIG_ACPI=y
#
# Debugging
#
CONFIG_DEBUG_LEVEL=3
CONFIG_DEBUG_SERIAL=y
CONFIG_DEBUG_SERIAL_PORT=0x3f8
# CONFIG_SCREEN_AND_DEBUG is not set
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