Re: [Qemu-devel] [PATCH 09/10] qemu-tech: rewrite some parts

[Emilio G. Cota]

On Thu, Oct 06, 2016 at 17:24:22 +0200, Paolo Bonzini wrote:
> Drop most the device emulation part and merge the rest into the description
> of the MMU.  Make some bits more up-to-date.
> 
> Signed-off-by: Paolo Bonzini <address@hidden>
(snip)
>  The host SIGSEGV and SIGBUS signal handlers are used to get invalid
> -memory accesses. The simulated program counter is found by
> -retranslating the corresponding basic block and by looking where the
> -host program counter was at the exception point.
> -
> -The virtual CPU cannot retrieve the exact @code{EFLAGS} register because
> -in some cases it is not computed because of condition code
> -optimisations. It is not a big concern because the emulated code can
> -still be restarted in any cases.
> -
> address@hidden MMU emulation
> address@hidden MMU emulation
> -
> -For system emulation QEMU supports a soft MMU. In that mode, the MMU
> +memory accesses. QEMU keeps a map that host program counter to
> +target program counter, and looks up where the exception happened
> +based on the host program counter at the exception point.

I had to read "keeps a map that host program to target program counter"
several times; that "that" confused me.
Perhaps "keeps a map of host-to-target program counters" would
be clearer?

> +On some targets, some bits of the virtual CPU's state are not flushed to the
> +memory until the end of the translation block.  This is done for internal

"flushed to memory" sounds better to me than "flushed to the memory".

                Emilio