linux-kernel - Re: Updated version of RD/WR FS/GS BASE patchkit

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Message-ID: <20160321230249.GJ5083@two.firstfloor.org>
Date:	Tue, 22 Mar 2016 00:02:49 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andi Kleen <andi@...stfloor.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Updated version of RD/WR FS/GS BASE patchkit

> Maybe.  Are there better options?  Could we, for example, actually try
> to preserve the state if this happens? 

We probably could, at the cost of making the context switch a bit 
more expensive.

> Would it be worth it?

I doubt it.

I expect once WR*BASE is widely used noone will bother with selectors
for 64bit programs anymore.

-Andi