[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v3 00/20] xen/arm64: Add support for 64KB page


Ping? I'm missing some reviews on block and netfront code.

We'd like to see this series going in Linux 4.3. Some distributions plans to use this version for aarch64 support. If we miss it, we won't have any Xen guests support, even it's minimal, for Linux using 64KB page granularity.


On 07/08/2015 09:46, Julien Grall wrote:
Hi all,

ARM64 Linux is supporting both 4KB and 64KB page granularity. Although, Xen
hypercall interface and PV protocol are always based on 4KB page granularity.

Any attempt to boot a Linux guest with 64KB pages enabled will result to a
guest crash.

This series is a first attempt to allow those Linux running with the current
hypercall interface and PV protocol.

This solution has been chosen because we want to run Linux 64KB in released
Xen ARM version or/and platform using an old version of Linux DOM0.

There is room for improvement, such as support of 64KB grant, modification
of PV protocol to support different page size... They will be explored in a
separate patch series later.

TODO list:
     - Convert swiotlb to 64KB
     - Convert xenfb to 64KB
     - Check if backend in QEMU works with DOM0 64KB
     - It may be possible to move some common define between
     netback/netfront and blkfront/blkback in an header

All patches has been built tested for ARM32, ARM64, x86. But I haven't tested
to run it on x86 as I don't have a box with Xen x86 running. I would be
happy if someone give a try and see possible regression for x86.

A branch based on the latest linux/master can be found here:

git://xenbits.xen.org/people/julieng/linux-arm.git branch xen-64k-v3

Comments, suggestions are welcomed.

Sincerely yours,

Cc: david.vrabel@xxxxxxxxxx
Cc: konrad.wilk@xxxxxxxxxx
Cc: boris.ostrovsky@xxxxxxxxxx
Cc: wei.liu2@xxxxxxxxxx
Cc: roger.pau@xxxxxxxxxx

Julien Grall (20):
   net/xen-netback: xenvif_gop_frag_copy: move GSO check out of the loop
   arm/xen: Drop pte_mfn and mfn_pte
   xen: Add Xen specific page definition
   xen/grant: Introduce helpers to split a page into grant
   xen/grant: Add helper gnttab_page_grant_foreign_access_ref_one
   block/xen-blkfront: Split blkif_queue_request in 2
   block/xen-blkfront: Store a page rather a pfn in the grant structure
   block/xen-blkfront: split get_grant in 2
   xen/biomerge: Don't allow biovec to be merge when Linux is not using
     4KB page
   xen/xenbus: Use Xen page definition
   tty/hvc: xen: Use xen page definition
   xen/balloon: Don't rely on the page granularity is the same for Xen
     and Linux
   xen/events: fifo: Make it running on 64KB granularity
   xen/grant-table: Make it running on 64KB granularity
   block/xen-blkfront: Make it running on 64KB page granularity
   block/xen-blkback: Make it running on 64KB page granularity
   net/xen-netfront: Make it running on 64KB page granularity
   net/xen-netback: Make it running on 64KB page granularity
   xen/privcmd: Add support for Linux 64KB page granularity
   arm/xen: Add support for 64KB page granularity

  arch/arm/include/asm/xen/page.h     |  18 +-
  arch/arm/xen/enlighten.c            |   6 +-
  arch/arm/xen/p2m.c                  |   6 +-
  arch/x86/include/asm/xen/page.h     |   2 +-
  drivers/block/xen-blkback/blkback.c |   5 +-
  drivers/block/xen-blkback/common.h  |  17 +-
  drivers/block/xen-blkback/xenbus.c  |   9 +-
  drivers/block/xen-blkfront.c        | 552 +++++++++++++++++++++++-------------
  drivers/net/xen-netback/common.h    |  15 +-
  drivers/net/xen-netback/netback.c   | 163 +++++++----
  drivers/net/xen-netfront.c          | 122 +++++---
  drivers/tty/hvc/hvc_xen.c           |   4 +-
  drivers/xen/balloon.c               |  47 ++-
  drivers/xen/biomerge.c              |   8 +
  drivers/xen/events/events_base.c    |   2 +-
  drivers/xen/events/events_fifo.c    |   2 +-
  drivers/xen/grant-table.c           |  32 ++-
  drivers/xen/privcmd.c               |   8 +-
  drivers/xen/xenbus/xenbus_client.c  |   6 +-
  drivers/xen/xenbus/xenbus_probe.c   |   3 +-
  drivers/xen/xlate_mmu.c             | 124 +++++---
  include/xen/grant_table.h           |  51 ++++
  include/xen/page.h                  |  27 +-
  23 files changed, 844 insertions(+), 385 deletions(-)

Julien Grall

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.