[Xen-devel] [PATCH 0/4] x86: Remove 16M total-size restriction

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

It turns out that the note in c/s a8d27a54cc9cc

  Finally, leave a linker assert covering the fact that plenty of code blindly
  assumes that Xen is less that 16M.  This wants fixing in due course.

was easier to address than I had originally anticipated.  This series does so.

The end result can be tested by trying to boot with:

  diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
  index 759827a19a..fa83a9a28f 100644
  --- a/xen/arch/x86/setup.c
  +++ b/xen/arch/x86/setup.c
  @@ -52,6 +52,8 @@
   #include <asm/spec_ctrl.h>
   #include <asm/guest.h>

  +static uint8_t __used big_data[MB(16)] = { 42, };
  +
   /* opt_nosmp: If true, secondary processors are ignored. */
   static bool __initdata opt_nosmp;
   boolean_param("nosmp", opt_nosmp);

Before this series, Xen will triple fault in one of several places (first and
most obviously, __high_start on the first stack access, as cpu0_stack[] is
very near the end of Xen's linked image).

Andrew Cooper (4):
  x86/boot: Rename l?_identmap to l?_directmap
  x86/page: Remove bifurcated PAGE_HYPERVISOR constant
  x86/boot: Create the l2_xenmap[] mappings dynamically
  x86/boot: Size the boot/directmap mappings dynamically

 xen/arch/x86/boot/head.S          | 35 +++++++++++++++++++++-------
 xen/arch/x86/boot/x86_64.S        | 49 +++++++++++++++++----------------------
 xen/arch/x86/efi/efi-boot.h       | 43 +++++++++++++++++++++++++++-------
 xen/arch/x86/setup.c              |  6 ++---
 xen/arch/x86/xen.lds.S            |  6 ++---
 xen/include/asm-x86/page.h        |  2 +-
 xen/include/asm-x86/x86_64/page.h |  7 ------
 7 files changed, 90 insertions(+), 58 deletions(-)

-- 
2.11.0


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