[Qemu-devel] [PATCH v2 0/2] Probe the guest memory space when using -R

[Meador Inge]

Hi,

This patch series fixes an issue that was discussed here [1] where using -R
can cause QEMU to fail to setup the guest address space because the guest base
validation fails.  I fixed this issue by (1) refactoring the guest space
probing code into a single function for initializing the guest space and (2) by 
calling the guest space initialization code for both the case of reserving the
guest space upfront (-R) and the case where the initial memory space base/size
are gleaned from an ELF image.

Tested by going through various combinations of -R <size>, -B <base>,
-B <base> -R <size>, and neither -R or -B passed.  I also ran the libstdc++
testsuite through the MIPS, ARM, and Power usermode emulators with -R set.
No regressions.

NOTE: This does not fix the problem that was raised concerning mapped the
full 32-bit address space on a 64-bit system.  That will need to be another
patch.

- Changes since v1:

   * Replaced '!host_start && !host_size' error check in 'init_guest_space'
     with an assert.

   * Ensured that 'guest_validate_base' is passed the true guest base instead
     of the current host start address.

   * s/init_guest_space(..., 0)/init_guest_space(..., false);/

   * Fixed typo in 'init_guest_space' header comment.

[1] http://lists.nongnu.org/archive/html/qemu-devel/2012-06/msg04508.html

Signed-off-by: Meador Inge <address@hidden>

Meador Inge (2):
  linux-user: Factor out guest space probing into a function
  linux-user: Use init_guest_space when -R and -B are specified

 linux-user/elfload.c |  161 ++++++++++++++++++++++++++++++++++++++------------
 linux-user/main.c    |   35 ++---------
 linux-user/qemu.h    |   15 ++++-
 3 files changed, 140 insertions(+), 71 deletions(-)

-- 
1.7.7.6