Add qemu pipe access with parameter
The following changes are crucial for GPU H/W acceleration because
some graphics applications like games perform very frequent QEMU pipe
operations to send GLES commands to the host translator.
For each read/write buffer operation, currently QEMU pipe requires five
MMIO operations.
This causes significant overhead when running with hardware virtualization
enabled (e.g. HAXM) because each MMIO causes expensive transition from
the guest kernel to the kernel driver, and to the QEMU user space in the end.
Among such five MMIO accesses, four of them are required to just set up the
parameters for the access, like the buffer address, length etc. By passing
a buffer containing such parameters, we need only one MMIO operation to
send a GLES command to the host translator.
Update the qemu_pipe save version for pipe struct changes.
Change-Id: Idf6400f3c4c9c8473311312bb1d8f3ea92d68797
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>
2 files changed
