[Xen-devel] [PATCH v2 0/5] x86: Remove more 16M total-size restrictions

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

The boot/directmap pagetables, high Xen pagetables, and use of BOOT_FS all
come with arbitrary limitations to Xen's total size.  Remove these limits.

Testing of the EFI build indicates that there is still an issue lurking
somewhere:

  (XEN) ----[ Xen-4.14-unstable  x86_64  debug=y   Not tainted ]----
  (XEN) CPU:    0
  (XEN) RIP:    e008:[<ffff82d0802557fa>] 
drivers/char/ns16550.c#ns16550_poll+0x1d/0x21
  ...
  (XEN) Xen call trace:
  (XEN)    [<ffff82d0802557fa>] R drivers/char/ns16550.c#ns16550_poll+0x1d/0x21
  (XEN)    [<ffff82d080247446>] F common/timer.c#execute_timer+0x49/0x64
  (XEN)    [<ffff82d080247c24>] F common/timer.c#timer_softirq_action+0xa2/0x276
  (XEN)    [<ffff82d080243b81>] F common/softirq.c#__do_softirq+0x71/0x9a
  (XEN)    [<ffff82d080243bdd>] F process_pending_softirqs+0x33/0x37
  (XEN)    [<ffff82d0812bd1be>] F __cpu_up+0x652/0x719
  (XEN)    [<ffff82d080204874>] F cpu_up+0x75/0xe3
  (XEN)    [<ffff82d08162ad43>] F __start_xen+0x251a/0x29b1
  (XEN)
  (XEN)
  (XEN) ****************************************
  (XEN) Panic on CPU 0:
  (XEN) FATAL TRAP: vector = 6 (invalid opcode)
  (XEN) ****************************************

which is run_in_exception_handler() not being recognised as BUGFRAME_run_fn.
Therefore, I've left the linker assert in place for now.

Andrew Cooper (5):
  x86/boot: Create the l2_xenmap[] mappings dynamically
  x86/boot: Size the boot/directmap mappings dynamically
  x86/boot: Drop explicit %fs uses
  x86/boot: Simplify pagetable manipulation loops
  x86/boot: Drop sym_fs()

 xen/arch/x86/boot/head.S       | 145 +++++++++++++++++++++++------------------
 xen/arch/x86/boot/trampoline.S |   1 -
 xen/arch/x86/boot/x86_64.S     |  23 +++----
 xen/arch/x86/efi/efi-boot.h    |  37 +++++++++--
 xen/arch/x86/xen.lds.S         |   3 +
 5 files changed, 126 insertions(+), 83 deletions(-)

-- 
2.11.0


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