Re: [Qemu-devel] Improve QEMU performance with LLVM codegen and other techniques

[陳韋任]

> > 3. Then a trace composed of TCG blocks is sent to a LLVM translator. The 
> > translator
> >   generates the host binary for the trace into a LLVM code cache, and patch 
> > the
> 
> I don't fully understand this part. Do you disassemble the x86 blob that TCG 
> emitted?

  We ask TCG to disassemble the guest binary where the trace beginning with
_again_ to get a set of TCG blocks, then sent them to the LLVM translator.
 
> > the moment (make the situation simpler), I think we still don't have to 
> > check
> > the blocks' hflags and segment descriptors in the trace to see if they 
> > match.
> 
> Yeah. You only need to be sync'ed with the invalidation then. And make sure 
> you patch the TB atomically, so you don't have a separate thread accidentally 
> run half your code and half the old code.

  Sync'ed with the invalidation means tb_flush, cpu_unlink and 
tb_phys_invalidate?
 
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