Re: [Qemu-devel] Optimization for amd CPUs without amd-v using sse2, 3, 4 instructions

[Blue Swirl]

On Sun, Apr 22, 2012 at 04:07, 陳韋任 <address@hidden> wrote:
>> I am using qemu to run VMs on my computer with amd chip on board.
>> However, my computer doesn't support amd-v, so the performance of the VM is 
>> low.
>> I do have experiences in optimization of program using sse technique.
>> Is it possible to speed up the qemu for those x86 chips that do not support 
>> hardware virtualization using sse instructions  ?
>> If so, I would like to contribute the the qemu community.
>
>  Without hardware virtualization (amd-v, for example), QEMU uses binary
> translation to run your VM. That says each guest instruction executed by
> the VM is translated into TCG ops (QEMU IR), then translated into host
> instructions and executed. Perhaps you have to look at tcg/i386/*, which
> is the TCG ops -> host binary part. Or, you can look at target-i386/*,
> which is the guest binary -> TCG ops part. Currently, guest SIMD instruction
> is emulated by helper functions in scalar manner. Maybe you can try to map
> guest SIMD into host SIMD.

Maybe kqemu could be revived, preferably using the same interface as KVM.

>
>  Good Luck!
>
> Regards,
> chenwj
>
> --
> Wei-Ren Chen (陳韋任)
> Computer Systems Lab, Institute of Information Science,
> Academia Sinica, Taiwan (R.O.C.)
> Tel:886-2-2788-3799 #1667
> Homepage: http://people.cs.nctu.edu.tw/~chenwj
>