On Mon, 8 Apr 2019, Thomas Garnier wrote:
> > It didn't work originally but I will revisit to see if I missed something.
>
> I revisited and couldn't find a way to prevent relocations to the
> percpu section. Without PIE, you can reference absolute address which
> was convenient for percpu.
Can y
On Thu, 31 Jan 2019, Thomas Garnier wrote:
> The per-cpu symbols are in a section that is zero based to create
> offsets. The compiler doesn't see them as offsets but as relative
> symbol and try to relocate them. Given the distance between zero and
> the mapped kernel is much larger than the inst
On Thu, 31 Jan 2019, Thomas Garnier wrote:
> Perpcu uses a clever design where the .percu ELF section has a virtual
> address of zero and the custom linux relocation code avoid relocating
> specific symbols. It makes the code simple and easily adaptable with or
> without SMP support.
We usually t
On Tue, 29 May 2018, Thomas Garnier wrote:
> Perpcu uses a clever design where the .percu ELF section has a virtual
> address of zero and the relocation code avoid relocating specific
> symbols. It makes the code simple and easily adaptable with or without
> SMP support.
>
> This design is incompa
On Wed, 14 Mar 2018, Peter Zijlstra wrote:
> On Tue, Mar 13, 2018 at 01:59:24PM -0700, Thomas Garnier wrote:
> > @@ -1576,7 +1578,9 @@ first_nmi:
> > addq$8, (%rsp) /* Fix up RSP */
> > pushfq /* RFLAGS */
> > pushq $__KERNEL_CS/* CS */
> > - pushq
