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SubjectRe: [PATCH v13 00/16] Enable FSGSBASE instructions
On Thu, Jun 18, 2020 at 7:18 AM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> Sasha,
>
> Sasha Levin <sashal@kernel.org> writes:
> > Changes from v12:
> > - Reformat the series to be closer to the reverted codebase for easier
> > review.
> > - Drop a few of the changes introduced in v8 and v9.
>
> I've pushed the lot out to
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/fsgsbase
>
> Thanks for taking this up!
>

Is there a plan to deal with:

/*
* This function has some ABI oddities.
*
* A 32-bit ptracer probably expects that writing FS or GS will change
* FSBASE or GSBASE respectively. In the absence of FSGSBASE support,
* this code indeed has that effect. When FSGSBASE is added, this
* will require a special case.
*
* For existing 64-bit ptracers, writing FS or GS *also* currently
* changes the base if the selector is nonzero the next time the task
* is run. This behavior may? not be needed, and trying to preserve it
* when FSGSBASE is added would be complicated at best.
*/

in arch/x86/kernel/ptrace.c?

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