Re: [Qemu-devel] [PATCH 00/17] RFC: userfault v2

[Peter Maydell]

On 29 October 2014 17:46, Andrea Arcangeli <address@hidden> wrote:
> After some chat during the KVMForum I've been already thinking it
> could be beneficial for some usage to give userland the information
> about the fault being read or write

...I wonder if that would let us replace the current nasty
mess we use in linux-user to detect read vs write faults
(which uses a bunch of architecture-specific hacks including
in some cases "look at the insn that triggered this SEGV and
decode it to see if it was a load or a store"; see the
various cpu_signal_handler() implementations in user-exec.c).

-- PMM