lkml.org 
[lkml]   [2005]   [Dec]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [discuss] [patch] x86_64: align and pad x86_64 GDT on page boundary
On Thu, Dec 08, 2005 at 03:09:17PM -0800, Rohit Seth wrote:
> On Thu, 2005-12-08 at 13:55 -0800, Ravikiran G Thirumalai wrote:
> > On Thu, Dec 08, 2005 at 09:15:18PM +0100, Andi Kleen wrote:
> > > On Thu, Dec 08, 2005 at 11:42:32AM -0800, Ravikiran G Thirumalai
> > wrote:
> > > >
> > > > - .align L1_CACHE_BYTES
> > > > + /* zero the remaining page */
> > > > + .fill PAGE_SIZE / 8 - GDT_ENTRIES,8,0
> > > > +
> > > > ENTRY(idt_table)
> > >
> > > Why can't the IDT not be shared with the GDT page? It should be
> > mostly
> > > read only right and putting r-o data on that page should be ok,
> > right?
> >
> > Yes, you are right. This should not have been a problem.
> > Some people reported this symbol (cpu_gdt) though. Will have to go
> > back and
> > check.
>
> IIRC, Zach's patches for gdt alignment, moved the gdts from per_cpu data
> structure to each secondary CPU dynamically allocating page for its gdt.

Kiran's patch does this too. Except for the BP GDT, which could
be shared with the single IDT.

-Andi (who actually plans to attack per CPU IDTs at some point
so this could change later)

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-12-09 00:14    [from the cache]
©2003-2011 Jasper Spaans