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From: Mark Brown <broonie@kernel.org>
To: Dave Martin <Dave.Martin@arm.com>
Cc: Julien Grall <julien@xen.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Zhang Lei <zhang.lei@jp.fujitsu.com>,
	Julien Grall <julien.grall@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	Daniel Kiss <Daniel.Kiss@arm.com>
Subject: Re: [PATCH v4 7/8] arm64/sve: Don't disable SVE on syscalls return
Date: Tue, 22 Sep 2020 17:04:03 +0100	[thread overview]
Message-ID: <20200922160403.GX4792@sirena.org.uk> (raw)
In-Reply-To: <20200922140321.GD6642@arm.com>


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On Tue, Sep 22, 2020 at 03:03:21PM +0100, Dave Martin wrote:
> On Mon, Sep 21, 2020 at 07:03:37PM +0100, Mark Brown wrote:

> > Having spent time looking at this the main issue and the main thing is
> > to look at allowing TIF_SVE and TIF_SVE_NEEDS_FLUSH to be simultaneously
> > set as you suggested above - the interaction with TIF_FOREIGN_FPSTATE is
> > fairly simple so I don't see a big problem there.

> Maybe just try to improve the documentation initially, and see where
> that gets us?

I'm not sure how far that's going to get us - the FP code already has
exceptionally clear documentation for arch code and even with good
documentation there's always the challenge of making sure that the code
is in sync with the claims the documentation makes.  I'll definitely
include that in what I'm looking at, I just don't think it can fully
address Will's concerns about how much there is to think about here
(which I do broadly agree with).

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  reply	other threads:[~2020-09-22 16:06 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-28 18:11 [PATCH v4 0/8] arm64/sve: First steps towards optimizing syscalls Mark Brown
2020-08-28 18:11 ` [PATCH v4 1/8] arm64/fpsimd: Update documentation of do_sve_acc Mark Brown
2020-08-28 18:11 ` [PATCH v4 2/8] arm64/signal: Update the comment in preserve_sve_context Mark Brown
2020-08-28 18:11 ` [PATCH v4 3/8] arm64/fpsimdmacros: Allow the macro "for" to be used in more cases Mark Brown
2020-09-21 12:38   ` Will Deacon
2020-09-21 16:53     ` Dave Martin
2020-09-21 18:09       ` Mark Brown
2020-09-22 13:51         ` Dave Martin
2020-09-22 13:59           ` Mark Brown
2020-09-22 14:07             ` Dave Martin
2020-08-28 18:11 ` [PATCH v4 4/8] arm64/fpsimdmacros: Introduce a macro to update ZCR_EL1.LEN Mark Brown
2020-08-28 18:11 ` [PATCH v4 5/8] arm64/sve: Implement a helper to flush SVE registers Mark Brown
2020-08-28 18:11 ` [PATCH v4 6/8] arm64/sve: Implement a helper to load SVE registers from FPSIMD state Mark Brown
2020-08-28 18:11 ` [PATCH v4 7/8] arm64/sve: Don't disable SVE on syscalls return Mark Brown
2020-09-21 12:36   ` Will Deacon
2020-09-21 18:03     ` Mark Brown
2020-09-22 14:03       ` Dave Martin
2020-09-22 16:04         ` Mark Brown [this message]
2020-08-28 18:11 ` [PATCH v4 8/8] arm64/sve: Rework SVE trap access to use TIF_SVE_NEEDS_FLUSH Mark Brown
2020-09-21 12:42 ` [PATCH v4 0/8] arm64/sve: First steps towards optimizing syscalls Will Deacon
2020-09-21 12:56   ` Mark Brown
2020-09-21 13:08     ` Will Deacon
2020-09-21 18:17 ` Will Deacon

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