tree 2d0b30158b848661cd21ed70eacb7c45c60463e7
parent 385065734cd417b9d7739b2ebb62c960aeb3ccb5
author Matt Mullins <mmullins@fb.com> 1563942058 -0700
committer Thomas Gleixner <tglx@linutronix.de> 1563963459 +0200

x86/entry/32: Pass cr2 to do_async_page_fault()

Commit a0d14b8909de ("x86/mm, tracing: Fix CR2 corruption") added the
address parameter to do_async_page_fault(), but does not pass it from the
32-bit entry point.  To plumb it through, factor-out
common_exception_read_cr2 in the same fashion as common_exception, and uses
it from both page_fault and async_page_fault.

For a 32-bit KVM guest, this fixes:

  Run /sbin/init as init process
  Starting init: /sbin/init exists but couldn't execute it (error -14)

Fixes: a0d14b8909de ("x86/mm, tracing: Fix CR2 corruption")
Signed-off-by: Matt Mullins <mmullins@fb.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190724042058.24506-1-mmullins@fb.com