xen: Xen paravirt_ops implementation

Hi,

This is the Xen implementation for the paravirt_ops interface. The series is based on 2.6.22-rc1-mm1, and I think its ready to be cooked in -mm with a view to being merged in 2.6.23.

The first part of the series is some small changes to the core kernel. Apart from the new code added in "Allocate and free vmalloc areas" (posted many times before), they are simply a few one-liners around the place.

paravirt: add an "mm" argument to alloc_pt
paravirt: add a hook for once the allocator is ready
paravirt: increase IRQ limit
paravirt: unstatic leave_mm
paravirt: unstatic smp_store_cpu_info
paravirt: make siblingmap functions visible
paravirt: export __supported_pte_mask
xen: Allocate and free vmalloc areas

 arch/i386/kernel/setup.c                           |    2 
 arch/i386/kernel/smp.c                             |    5 -
 arch/i386/kernel/smpboot.c                         |    8 -
 arch/i386/kernel/vsyscall-note.S                   |   28 +++++
 arch/i386/mm/init.c                                |    1 
 include/asm-i386/mach-default/irq_vectors_limits.h |    2 
 include/asm-i386/mmu_context.h                     |    2 
 include/asm-i386/paravirt.h                        |    8 +
 include/asm-i386/setup.h                           |    4 
 include/asm-i386/smp.h                             |    5 +
 include/linux/vmalloc.h                            |    4 
 mm/vmalloc.c                                       |   53 +++++++++++
 12 files changed, 114 insertions(+), 8 deletions(-)

The rest of the series is the Xen implementation itself. This includes the core of Xen itself, plus the Xenbus virtual bus, and virtual console, disk and net drivers. The vast majority of it is new code, with a few changes to non-Xen files to:

1. Makefile/Kconfig build stuff
2. add a new ELF note to the VDSO to select a Xen-optimised libc
3. a chunk of new code in entry.S, to handle upcalls from Xen, which in turn need to jump into other entry.S labels
4. Define a proper label for PG_owner_priv_1
5. Define a major for the Xen virtual block device
6. Increate NR_IRQ to 224 when CONFIG_PARAVIRT is enabled, even if there's no IO APIC.

xen: Add nosegneg capability to the vsyscall page notes
xen: Add Xen interface header files
xen: Core Xen implementation
xen: Xen virtual mmu
xen: xen event channels
xen: xen time implementation
xen: xen configuration
xen: add pinned page flag
xen: Complete pagetable pinning for Xen
xen: ignore RW mapping of RO pages in pagetable_init
xen: Account for time stolen by Xen
xen: Implement xen_sched_clock
xen: Xen SMP guest support
xen: Add support for preemption
xen: lazy-mmu operations
xen: hack to prevent bad segment register reload
xen: Use the hvc console infrastructure for Xen console
xen: Add Xen grant table support
xen: Add the Xenbus sysfs and virtual device hotplug driver.
xen: Add Xen virtual block device driver.
xen: Add the Xen virtual network device driver.
xen: Xen machine operations
xen: handle external requests for shutdown, reboot and sysrq
xen: Place vcpu_info structure into per-cpu memory, if possible
xen: Attempt to patch inline versions of common operations

 arch/i386/Kconfig                     |    2 
 arch/i386/Makefile                    |    3 

 arch/i386/kernel/asm-offsets.c        |    7 
 arch/i386/kernel/entry.S              |   71 
 arch/i386/kernel/head.S               |    5 
 arch/i386/kernel/vmlinux.lds.S        |    1 

 arch/i386/xen/Kconfig                 |   11 
 arch/i386/xen/Makefile                |    4 
 arch/i386/xen/enlighten.c             | 1134 +++++++++++++
 arch/i386/xen/events.c                |  588 +++++++
 arch/i386/xen/features.c              |   29 
 arch/i386/xen/manage.c                |  143 +
 arch/i386/xen/mmu.c                   |  599 +++++++
 arch/i386/xen/mmu.h                   |   60 
 arch/i386/xen/multicalls.c            |  115 +
 arch/i386/xen/multicalls.h            |   45 
 arch/i386/xen/setup.c                 |   93 +
 arch/i386/xen/smp.c                   |  405 ++++
 arch/i386/xen/time.c                  |  585 +++++++
 arch/i386/xen/xen-asm.S               |  114 +
 arch/i386/xen/xen-head.S              |   36 
 arch/i386/xen/xen-ops.h               |   70 

 arch/x86_64/kernel/early_printk.c     |    5 

 drivers/Makefile                      |    2 
 drivers/block/Kconfig                 |    8 
 drivers/block/Makefile                |    1 
 drivers/block/xen-blkfront.c          |  988 +++++++++++

 drivers/char/Kconfig                  |    8 
 drivers/char/Makefile                 |    1 
 drivers/char/hvc_xen.c                |  159 +

 drivers/net/Kconfig                   |   12 
 drivers/net/Makefile                  |    1 
 drivers/net/xen-netfront.c            | 1995 ++++++++++++++++++++++++

 drivers/xen/Makefile                  |    2 
 drivers/xen/grant-table.c             |  582 +++++++
 drivers/xen/xenbus/Makefile           |    7 
 drivers/xen/xenbus/xenbus_client.c    |  569 ++++++
 drivers/xen/xenbus/xenbus_comms.c     |  233 ++
 drivers/xen/xenbus/xenbus_comms.h     |   46 
 drivers/xen/xenbus/xenbus_probe.c     |  935 +++++++++++
 drivers/xen/xenbus/xenbus_probe.h     |   74 
 drivers/xen/xenbus/xenbus_xs.c        |  861 ++++++++++

 include/asm-i386/irq.h                |    1 
 include/asm-i386/xen/hypercall.h      |  431 +++++
 include/asm-i386/xen/hypervisor.h     |   73 
 include/asm-i386/xen/interface.h      |  187 ++
 include/linux/major.h                 |    2 
 include/linux/page-flags.h            |    5 

 include/xen/events.h                  |   48 
 include/xen/features.h                |   23 
 include/xen/grant_table.h             |  107 +
 include/xen/hvc-console.h             |    6 
 include/xen/interface/elfnote.h       |  133 +
 include/xen/interface/event_channel.h |  195 ++
 include/xen/interface/features.h      |   43 
 include/xen/interface/grant_table.h   |  375 ++++
 include/xen/interface/io/blkif.h      |   94 +
 include/xen/interface/io/console.h    |   23 
 include/xen/interface/io/netif.h      |  156 +
 include/xen/interface/io/ring.h       |  260 +++
 include/xen/interface/io/xenbus.h     |   42 
 include/xen/interface/io/xs_wire.h    |   87 +
 include/xen/interface/memory.h        |  145 +
 include/xen/interface/physdev.h       |  145 +
 include/xen/interface/sched.h         |   77 
 include/xen/interface/vcpu.h          |  177 ++
 include/xen/interface/version.h       |   60 
 include/xen/interface/xen.h           |  446 +++++
 include/xen/page.h                    |  178 ++
 include/xen/xenbus.h                  |  234 ++
 70 files changed, 14361 insertions(+), 1 deletion(-)