[Qemu-devel] [PATCH 00/10] linux-user: Speed up guest space initialization on 32-bit ARM target

[Luke Shumaker]

From: Luke Shumaker <address@hidden>

The goal of this patchset is to fix
https://bugs.launchpad.net/qemu/+bug/1740219

The gist is that the current linear search for an acceptable address
range is a bad strategy when the reason we didn't get a good address
on the first try is that we've having problems mapping the commpage
for the 32-bit ARM target; especially if ASLR is disabled.

I think that only the final patch in this patchset is actually
necessary to fix the issue; but I didn't feel comfortable writing it
without also makeing the preceding (small) changes.

Luke Shumaker (10):
  linux-user: Use #if to only call validate_guest_space for 32-bit ARM
    target
  linux-user: Rename validate_guest_space => init_guest_commpage
  linux-user: init_guest_space: Clean up if we can't initialize the
    commpage
  linux-user: init_guest_space: Correctly handle guest_start in commpage
    initialization
  linux-user: init_guest_space: Clarify page alignment logic
  linux-user: init_guest_commpage: Add a comment about size check
  linux-user: init_guest_space: Clean up control flow a bit
  linux-user: init_guest_space: Don't try to align if we'll reject it
  linux-user: init_guest_space: Add a comment about search strategy
  linux-user: init_guest_space: Try to make ARM space+commpage
    continuous

 linux-user/elfload.c | 145 ++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 114 insertions(+), 31 deletions(-)

-- 
2.15.1

Happy hacking,
~ Luke Shumaker