Re: [Qemu-devel] [PATCH 0/2] exec: alternative fix for master abort woes

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Nov 07, 2013 at 05:29:15PM +0100, Paolo Bonzini wrote:
> Il 07/11/2013 17:21, Michael S. Tsirkin ha scritto:
> >> > This fixes the problems with the misalignment of the master abort region.
> >> > See patch 2 for details, patch 1 is just a preparatory search-and-replace
> >> > patch.
> >> > 
> >> > Paolo Bonzini (2):
> >> >   split definitions for exec.c and translate-all.c radix trees
> >> >   exec: make address spaces 64-bit wide
> > Can you please share info on testing you did?
> > 
> 
> "make check", booting a RHEL guest with both KVM and TCG, Luiz's gdb
> crash.  I also ran vmexit.flat from kvm-unit-tests and checked that
> there was no measurable slowdown.
> 
> Paolo

That's on kvm with 52 bit address.
But where I would be concerned is systems with e.g. 36 bit address
space where we are doubling the cost of the lookup.
E.g. try i386 and not x86_64.

-- 
But