[Xen-devel] [PATCH v2 0/8] Map Xen code/data/bss with superpages

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

And make use of NX and RO attributes wherever possible.

After this series, the pagetable layout looks like:

(XEN) *** Dumping Xen text/data/bss mappings from ffff82d080000000
(XEN) cr3 0000000826484000, idle_pg_table ffff82d080818000, pa 00000000ac018000
(XEN) l2_xenmap: ffff82d080814000, pa 00000000ac014000
(XEN)  L4[261] = 00000000ac017163 X Gl S RW P
(XEN)   L3[322] = 00000000ac014163 X Gl S RW P
(XEN)    L2[000] = 00000000ab8001e1 X Gl + S RO P    <- .text
(XEN)    L2[001] = 00000000aba001a1 X Gl + S RO P    <- .text
(XEN)    L2[002] = 80000000abc001a1 NX Gl + S RO P   <- .rodata
                                                     <- discarded .init
(XEN)    L2[004] = 80000000ac0001e3 NX Gl + S RW P   <- .data and .bss
(XEN)    L2[511] = 000000084dcc7063 X S RW P         <- stubs


Andrew Cooper (8):
  xen/lockprof: Move .lockprofile.data into .rodata
  xen/x86: Improvements to build-time pagetable generation
  xen/x86: Construct the {l2,l3}_bootmap at compile time
  xen/memguard: Drop memguard_init() entirely
  xen/x86: Disable CR0.WP while applying alternatives
  xen/x86: Reorder .data and .init when linking
  xen/x86: Use 2M superpages for text/data/bss mappings
  xen/x86: Unilaterally remove .init mappings

 xen/arch/arm/xen.lds.S     |  14 +++----
 xen/arch/x86/alternative.c |   7 ++++
 xen/arch/x86/boot/head.S   |  18 +++-----
 xen/arch/x86/boot/x86_64.S |  64 ++++++++++++++++++++--------
 xen/arch/x86/mm.c          |  16 -------
 xen/arch/x86/setup.c       |  64 ++++++++++++++++++++--------
 xen/arch/x86/x86_64/mm.c   |   4 --
 xen/arch/x86/xen.lds.S     | 102 +++++++++++++++++++++++++++++----------------
 xen/include/asm-arm/mm.h   |   1 -
 xen/include/asm-x86/mm.h   |   2 -
 xen/include/xen/kernel.h   |   7 ++++
 xen/include/xen/spinlock.h |   2 +-
 12 files changed, 186 insertions(+), 115 deletions(-)

-- 
2.1.4


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