Update mailmap

This makes get_maintainers.pl behave a little better.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>
exec: fix writing to MMIO area with non-power-of-two length

The problem is introduced by commit 2332616 (exec: Support 64-bit
operations in address_space_rw, 2013-07-08).  Before that commit,
memory_access_size would only return 1/2/4.

Since alignment is already handled above, reduce l to the largest
power of two that is smaller than l.

Cc: qemu-stable@nongnu.org
Reported-by: Oleksii Shevchuk <alxchk@gmail.com>
Tested-by: Oleksii Shevchuk <alxchk@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
exec: check offset_within_address_space for register subpage

If offset_within_address_space falls in a page, then we register a
subpage. So check offset_within_address_space rather than
offset_within_region.

Cc: qemu-stable@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: "Andreas Färber" <afaerber@suse.de>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
memory: Provide separate handling of unassigned io ports accesses

Accesses to unassigned io ports shall return -1 on read and be ignored
on write. Ensure these properties via dedicated ops, decoupling us from
the memory core's handling of unassigned accesses.

Cc: qemu-stable@nongnu.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Revert "memory: Return -1 again on reads from unsigned regions"

This reverts commit 9b8c69243585a32d14b9bb9fcd52c37b0b5a1b71.

The commit was wrong: We only return -1 on invalid accesses, not on
valid but unbacked ones. This broke various corner cases.

Cc: qemu-stable@nongnu.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
exec: do tcg_commit only when tcg_enabled

Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Merge remote-tracking branch 'bonzini/iommu-for-anthony' into staging

# By Jan Kiszka (2) and others
# Via Paolo Bonzini
* bonzini/iommu-for-anthony:
  exec: do tcg_commit only when tcg_enabled
  Revert "memory: Return -1 again on reads from unsigned regions"
  memory: Provide separate handling of unassigned io ports accesses
  exec: check offset_within_address_space for register subpage
  exec: fix writing to MMIO area with non-power-of-two length

Message-id: 1378401455-583-1-git-send-email-pbonzini@redhat.com
mips_malta: support up to 2GiB RAM

A Malta board can support up to 2GiB of RAM. Since the unmapped kseg0/1
regions are only 512MiB large & the latter 256MiB of those are taken up
by the IO region, access to RAM beyond 256MiB must be done through a
mapped region. In the case of a Linux guest this means we need to use
highmem.

The mainline Linux kernel does not support highmem for Malta at this
time, however this can be tested using the linux-mti-3.8 kernel branch
available from:

  git://git.linux-mips.org/pub/scm/linux-mti.git

You should be able to boot a Linux kernel built from the linux-mti-3.8
branch, with CONFIG_HIGHMEM enabled, using 2GiB RAM by passing "-m 2G"
to QEMU and appending the following kernel parameters:

  mem=256m@0x0 mem=256m@0x90000000 mem=1536m@0x20000000

Note that the upper half of the physical address space of a Malta
mirrors the lower half (hence the 2GiB limit) except that the IO region
(0x10000000-0x1fffffff in the lower half) is not mirrored in the upper
half. That is, physical addresses 0x90000000-0x9fffffff access RAM
rather than the IO region, resulting in a physical address space
resembling the following:

  0x00000000 -> 0x0fffffff  RAM
  0x10000000 -> 0x1fffffff  I/O
  0x20000000 -> 0x7fffffff  RAM
  0x80000000 -> 0x8fffffff  RAM (mirror of 0x00000000 -> 0x0fffffff)
  0x90000000 -> 0x9fffffff  RAM
  0xa0000000 -> 0xffffffff  RAM (mirror of 0x20000000 -> 0x7fffffff)

The second mem parameter provided to the kernel above accesses the
second 256MiB of RAM through the upper half of the physical address
space, making use of the aliasing described above in order to avoid
the IO region and use the whole 2GiB RAM.

The memory setup may be seen as 'backwards' in this commit since the
'real' memory is mapped in the upper half of the physical address space
and the lower half contains the aliases. On real hardware it would be
typical to see the upper half of the physical address space as the alias
since the bus addresses generated match the lower half of the physical
address space. However since the memory accessible in the upper half of
the physical address space is uninterrupted by the IO region it is
easiest to map the RAM as a whole there, and functionally it makes no
difference to the target code.

Due to the requirements of accessing the second 256MiB of RAM through
a mapping to the upper half of the physical address space it is usual
for the bootloader to indicate a maximum of 256MiB memory to a kernel.
This allows kernels which do not support such access to boot on systems
with more than 256MiB of RAM. It is also the behaviour assumed by Linux.
QEMUs small generated bootloader is modified to provide this behaviour.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>