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Message-ID: <20161017234556.GA18947@test-lenovo>
Date: Mon, 17 Oct 2016 16:45:56 -0700
From: Yu-cheng Yu <yu-cheng.yu@...el.com>
To: Andy Lutomirski <luto@...capital.net>
Cc: Rik van Riel <riel@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Lutomirski <luto@...nel.org>,
dave.hansen@...el.linux.com, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH RFC 1/3] fpu/x86: add make_fpregs_active(_newstate)
helper functions
On Mon, Oct 17, 2016 at 04:30:47PM -0700, Andy Lutomirski wrote:
> Rik wants to add a different form of FPU laziness, and it would be
> simpler if we could just always copy from a kernel buffer. Does code
> to do that exist in the tree?
If we know fpregs are not active at the time of the copy and compacted format
is the concern, can we use copyout_from_xsaves() in xstate.c?
Yu-cheng
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