Re: [RFC PATCH 00/16] PTI support for x86-32

[Joerg Roedel]

Hi Alan,

On Thu, Jan 25, 2018 at 05:09:25PM +0000, Alan Cox wrote:
> On Mon, 22 Jan 2018 09:56:25 +0100
> Joerg Roedel <joro@xxxxxxxxxx> wrote:
> 
> > Hey Nadav,
> > 
> > On Sun, Jan 21, 2018 at 03:46:24PM -0800, Nadav Amit wrote:
> > > It does seem that segmentation provides sufficient protection from Meltdown.  
> > 
> > Thanks for testing this, if this turns out to be true for all affected
> > uarchs it would be a great and better way of protection than enabling
> > PTI.
> > 
> > But I'd like an official statement from Intel on that one, as their
> > recommended fix is still to use PTI.
> 
> It is: we don't think segmentation works on all processors as a defence.

Thanks for checking and the official statement. So the official
mitigation recommendation is still to use PTI.


Regards,

	Joerg