Re: [PATCH 5/5] add setting gs/fsbase

[Samuel Thibault]

Sergey Bugaev, le jeu. 20 avril 2023 15:05:25 +0300, a ecrit:
> On Thu, Apr 20, 2023 at 2:56 PM Samuel Thibault <samuel.thibault@gnu.org> 
> wrote:
> >
> > Hello,
> >
> > Sergey Bugaev, le jeu. 20 avril 2023 14:51:04 +0300, a ecrit:
> > > Why was this not an issue for us on i386?
> >
> > See 56010b73e81e2cb1082e418699f98353598fe671 and its __mig_memcpy.
> 
> Interesting; but that one's dealing with the SHARED case, isn't it?

Yes but I guess it fixed the static case too?

> > > VM_MAX_USER_ADDRESS, which is defined to VM_MAX_ADDRESS, which is then
> > > defined to 0xc0000000, same as on i386. That's of course too small.
> > > Can we bump this substantially?
> >
> > Of course !
> 
> Let me actually try doing #define VM_MAX_ADDRESS KENEL_MAP_BASE...

It doesn't need to be that high :)

And actually it probably cannot: IIRC not all bits can be used in amd64
virtual addresses anyway.

Samuel