tree fc41fde5c66eb4fa6673c13bad5776aafd1355db
parent 38b202e18b9663b0b2415629c77169f959d7361f
author Jiang, Yunhong <yunhong.jiang@intel.com> 1333287439 +0800
committer David 'Digit' Turner <digit@android.com> 1394637901 +0100

Qemu pipe access with parameter

In current implementation, each qemu_pipe read/write buffer requires severals
MMIO operations to pass down the parameters like buffer address, pipe, length
etc. This has impacts on emulator performance when running under the HAXM
environment because each MMIO access cause expensive transition from guest to
HAXM driver and QEMU process.
To reduce the overhead, we put the parameter into a buffer without causing
MMIO access, and then invoke a single MMIO operation needed for the access
command.

Change-Id: I1bce409a76ed69b2f9e91d86265a61c81493e9f8
Signed-off-by: Xin, Xiaohui <xiaohui.xin@intel.com>
Signed-off-by: Jiang, Yunhong <yunhong.jiang@intel.com>
Signed-off-by: Nakajima, Jun <jun.nakajima@intel.com>