[PATCH v3 00/23] Introduce Xen support on ARM

Russell,
sorry for not CC'ing you on the entire patch series in the past, I'll do
it in the next iteration of the series (that TBH is nearly identical to
this one apart from being 3.6-rc5 based).

Are you happy with it? Given that the changes are entirely contained
within arch/arm/xen and arch/arm/include/asm/xen (apart from patch #21
that is a generic ARM fix), should this patch series go through you or
Arnd?

Thanks,

Stefano




On Thu, 16 Aug 2012, Stefano Stabellini wrote:

Hi all,
this patch series implements Xen support for ARMv7 with virtualization
extensions.  It allows a Linux guest to boot as dom0 and
as domU on Xen on ARM. PV console, disk and network frontends and
backends are all working correctly.

It has been tested on a Versatile Express Cortex A15 emulator, using the
latest Xen ARM developement branch
(git://xenbits.xen.org/people/ianc/xen-unstable.git arm-for-4.3) plus
the "ARM hypercall ABI: 64 bit ready" patch series
(http://marc.info/?l=xen-devel&m=134426267205408), and a simple ad-hoc
tool to build guest domains (marc.info/?l=xen-devel&m=134089788016546).

The patch marked with [HACK] shouldn't be applied and is part of the
series only because it is needed to create domUs.

I am also attaching to this email the dts'es that I am currently using
for dom0 and domU: vexpress-v2p-ca15-tc1.dts (that includes
vexpress-v2m-rs1-rtsm.dtsi) is the dts used for dom0 and it is passed to
Linux by Xen, while vexpress-virt.dts is the dts used for other domUs
and it is appended in binary form to the guest kernel image. I am not
sure where they are supposed to live yet, so I am just attaching them
here so that people can actually try out this series if they want to.

Comments are very welcome!


Changes in v3:
- move patches that have been picked up by Konrad at the end of the
  series;
- improve comments;
- add a doc to describe the Xen Device Tree format;
- do not use xen_ulong_t for multicalls and apic_physbase;
- add a patch at the end of the series to use the new __HVC macro;
- add missing pvclock-abi.h include to ia64 header files;
- do not use an anonymous union in struct xen_add_to_physmap.


Changes in v2:
- fix up many comments and commit messages;
- remove the early_printk patches: rely on the emulated serial for now;
- remove the xen_guest_init patch: without any PV early_printk, we don't
  need any early call to xen_guest_init, we can rely on core_initcall
  alone;
- define an HYPERCALL macro for 5 arguments hypercall wrappers, even if
  at the moment is unused;
- use ldm instead of pop in the hypercall wrappers;
- return -ENOSYS rather than -1 from the unimplemented grant_table
  functions;
- remove the pvclock ifdef in the Xen headers;
- remove include linux/types.h from xen/interface/xen.h;
- replace pr_info with pr_debug in xen_guest_init;
- add a new patch to introduce xen_ulong_t and use it top replace all
  the occurences of unsigned long in the public Xen interface;
- explicitely size all the pointers to 64 bit on ARM, so that the
  hypercall ABI is "64 bit ready";
- clean up xenbus_init;
- make pci.o depend on CONFIG_PCI and acpi.o depend on CONFIG_ACPI;
- mark Xen guest support on ARM as EXPERIMENTAL;
- introduce GRANT_TABLE_PHYSADDR;
- remove unneeded initialization of boot_max_nr_grant_frames;
- add a new patch to clear IRQ_NOAUTOEN and IRQ_NOREQUEST in events.c;
- return -EINVAL from xen_remap_domain_mfn_range if
  auto_translated_physmap;
- retain binary compatibility in xen_add_to_physmap: use a union to
  introduce foreign_domid.


Ian Campbell (1):
      [HACK] xen/arm: implement xen_remap_domain_mfn_range

Stefano Stabellini (24):
      arm: initial Xen support
      xen/arm: hypercalls
      xen/arm: page.h definitions
      xen/arm: sync_bitops
      xen/arm: empty implementation of grant_table arch specific functions
      docs: Xen ARM DT bindings
      xen/arm: Xen detection and shared_info page mapping
      xen/arm: Introduce xen_pfn_t for pfn and mfn types
      xen/arm: Introduce xen_ulong_t for unsigned long
      xen/arm: compile and run xenbus
      xen: do not compile manage, balloon, pci, acpi and cpu_hotplug on ARM
      xen/arm: introduce CONFIG_XEN on ARM
      xen/arm: get privilege status
      xen/arm: initialize grant_table on ARM
      xen/arm: receive Xen events on ARM
      xen: clear IRQ_NOAUTOEN and IRQ_NOREQUEST
      xen/arm: implement alloc/free_xenballooned_pages with alloc_pages/kfree
      xen: allow privcmd for HVM guests
      xen/arm: compile blkfront and blkback
      xen/arm: compile netback
      arm/v2m: initialize arch_timers even if v2m_timer is not present
      xen/arm: use the __HVC macro
      xen: missing includes
      xen: update xen_add_to_physmap interface

 Documentation/devicetree/bindings/arm/xen.txt |   22 +++
 arch/arm/Kconfig                              |   10 +
 arch/arm/Makefile                             |    1 +
 arch/arm/include/asm/hypervisor.h             |    6 +
 arch/arm/include/asm/sync_bitops.h            |   27 +++
 arch/arm/include/asm/xen/events.h             |   18 ++
 arch/arm/include/asm/xen/hypercall.h          |   69 +++++++
 arch/arm/include/asm/xen/hypervisor.h         |   19 ++
 arch/arm/include/asm/xen/interface.h          |   73 ++++++++
 arch/arm/include/asm/xen/page.h               |   82 ++++++++
 arch/arm/mach-vexpress/v2m.c                  |   11 +-
 arch/arm/xen/Makefile                         |    1 +
 arch/arm/xen/enlighten.c                      |  245 +++++++++++++++++++++++++
 arch/arm/xen/grant-table.c                    |   53 ++++++
 arch/arm/xen/hypercall.S                      |  102 ++++++++++
 arch/ia64/include/asm/xen/interface.h         |    8 +-
 arch/x86/include/asm/xen/interface.h          |    8 +
 arch/x86/xen/enlighten.c                      |    1 +
 arch/x86/xen/irq.c                            |    1 +
 arch/x86/xen/mmu.c                            |    3 +
 arch/x86/xen/xen-ops.h                        |    1 -
 drivers/block/xen-blkback/blkback.c           |    1 +
 drivers/net/xen-netback/netback.c             |    1 +
 drivers/net/xen-netfront.c                    |    1 +
 drivers/tty/hvc/hvc_xen.c                     |    2 +
 drivers/xen/Makefile                          |   11 +-
 drivers/xen/events.c                          |   18 ++-
 drivers/xen/grant-table.c                     |    1 +
 drivers/xen/privcmd.c                         |   20 +-
 drivers/xen/xenbus/xenbus_comms.c             |    2 +-
 drivers/xen/xenbus/xenbus_probe.c             |   62 +++++--
 drivers/xen/xenbus/xenbus_probe_frontend.c    |    1 +
 drivers/xen/xenbus/xenbus_xs.c                |    1 +
 drivers/xen/xenfs/super.c                     |    7 +
 include/xen/events.h                          |    2 +
 include/xen/interface/features.h              |    3 +
 include/xen/interface/grant_table.h           |    4 +-
 include/xen/interface/io/protocols.h          |    3 +
 include/xen/interface/memory.h                |   32 ++-
 include/xen/interface/physdev.h               |    2 +-
 include/xen/interface/platform.h              |    4 +-
 include/xen/interface/version.h               |    2 +-
 include/xen/interface/xen.h                   |    7 +-
 include/xen/privcmd.h                         |    3 +-
 include/xen/xen.h                             |    2 +-
 45 files changed, 885 insertions(+), 68 deletions(-)


A branch based on 3.5-rc7 is available here (the __HVC patch is missing
from this branch because it depends on "ARM: opcodes: Facilitate custom
opcode injection" http://marc.info/?l=linux-arm-kernel&m=134442896128124):

git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 3.5-rc7-arm-3

Cheers,

Stefano