linux-kernel - Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues

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Message-ID: <CALCETrWQUEKKvVcHV+KtuBD=MadaRbvqJGoRipFWmKLCS3T08A@mail.gmail.com>
Date:	Fri, 29 Apr 2016 13:25:04 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc:	Dave Hansen <dave.hansen@...ux.intel.com>, X86 ML <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...e.de>,
	Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
	"Ravi V. Shankar" <ravi.v.shankar@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues

On Fri, Apr 29, 2016 at 1:07 PM, Yu-cheng Yu <yu-cheng.yu@...el.com> wrote:
> On Fri, Apr 29, 2016 at 01:03:43PM -0700, Dave Hansen wrote:
>> That's not feasible.  Think of dynamic libraries or just-in-time
>> compilers.  What instruction set does /usr/bin/java use, for instance? :)
>
> The java argument is true. In that case or when the bitmask is missing, we can allocate for all supported features.
>

I actually want to see us moving in the direction of unconditionally
allocating everything on process startup.  If we can stop using CR0.TS
entirely, I think everything will be better.

--Andy