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From: Stefano Stabellini <sstabellini@kernel.org>
To: Julien Grall <julien.grall@arm.com>
Cc: andre.przywara@arm.com,
	Stefano Stabellini <sstabellini@kernel.org>,
	steve.capper@arm.com, wei.chen@arm.com, xen-devel@lists.xen.org
Subject: Re: [PATCH v3 16/16] xen/arm: arm64: Document Cortex-A57 erratum 834220
Date: Wed, 22 Jun 2016 11:37:30 +0100 (BST)	[thread overview]
Message-ID: <alpine.DEB.2.10.1606221137191.2575@sstabellini-ThinkPad-X260> (raw)
In-Reply-To: <576A6600.6000504@arm.com>

On Wed, 22 Jun 2016, Julien Grall wrote:
> Hi Stefano,
> 
> On 22/06/16 11:08, Stefano Stabellini wrote:
> > On Tue, 7 Jun 2016, Julien Grall wrote:
> > > The ARM erratum applies to certain revisions of Cortex-A57. The
> > > processor may report a Stage 2 translation fault as the result of
> > > Stage 1 fault for load crossing a page boundary when there is a
> > > permission fault or device memory fault at stage 1 and a translation
> > > fault at Stage 2.
> > > 
> > > So Xen needs to check that Stage 1 translation does not generate a fault
> > > before handling the Stage 2 fault. If it is a Stage 1 translation fault,
> > > return to the guest to let the processor injecting the correct fault.
> >                            ^let the process inject (let somebody do
> > something)
> > 
> > 
> > > Only document it as this is already the behavior of the fault handlers.
> > > Note that some optimization could be done to avoid unnecessary translation
> > > fault. This is because HPFAR_EL2 is valid for more use case. For the
> > > moment,
> > > the code is left unmodified.
> > > 
> > > Signed-off-by: Julien Grall <julien.grall@arm.com>
> > 
> > Acked-by: Stefano Stabellini <sstabellini@kernel.org>
> 
> I have another series coming up which require to implement a workaround for
> the erratum.
> 
> Given this is only documentation, I am planning to drop this patch from the
> series.

All right

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      reply	other threads:[~2016-06-22 10:37 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-07 16:06 [PATCH v3 00/16] xen/arm: Introduce alternative runtime patching for ARM64 Julien Grall
2016-06-07 16:06 ` [PATCH v3 01/16] xen/arm: Makefile: Sort the entries alphabetically Julien Grall
2016-06-07 16:06 ` [PATCH v3 02/16] xen/arm: Include the header asm-arm/system.h in asm-arm/page.h Julien Grall
2016-06-07 16:06 ` [PATCH v3 03/16] xen/arm: Add macros to handle the MIDR Julien Grall
2016-06-07 16:06 ` [PATCH v3 04/16] xen/arm: Add cpu_hwcap bitmap Julien Grall
2016-06-07 16:06 ` [PATCH v3 05/16] xen/arm64: Add an helper to invalidate all instruction caches Julien Grall
2016-06-07 16:06 ` [PATCH v3 06/16] xen/arm: arm64: Move the define BRK_BUG_FRAME into a separate header Julien Grall
2016-06-07 16:06 ` [PATCH v3 07/16] xen/arm: arm64: Reserve a brk immediate to fault on purpose Julien Grall
2016-06-07 16:06 ` [PATCH v3 08/16] xen/arm: arm64: Add helpers to decode and encode branch instructions Julien Grall
2016-06-07 16:06 ` [PATCH v3 09/16] xen/arm: Introduce alternative runtime patching Julien Grall
2016-06-07 17:24   ` Konrad Rzeszutek Wilk
2016-06-08  9:39     ` Julien Grall
2016-06-08 18:17       ` Konrad Rzeszutek Wilk
2016-06-08 18:22         ` Julien Grall
2016-06-08 18:35           ` Konrad Rzeszutek Wilk
2016-06-09 13:33   ` Julien Grall
2016-06-07 16:06 ` [PATCH v3 10/16] xen/arm: cpufeature: Provide an helper to check if a capability is supported Julien Grall
2016-06-22  9:59   ` Stefano Stabellini
2016-06-22 10:09     ` Julien Grall
2016-06-22 10:14       ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 11/16] xen/arm: Detect silicon revision and set cap bits accordingly Julien Grall
2016-06-22 10:00   ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 12/16] xen/arm: Document the errata implemented in Xen Julien Grall
2016-06-22 10:03   ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 13/16] xen/arm: arm64: Add Cortex-A53 cache errata workaround Julien Grall
2016-06-22 10:04   ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 14/16] xen/arm: arm64: Add cortex-A57 erratum 832075 workaround Julien Grall
2016-06-22 10:10   ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 15/16] xen/arm: traps: Don't inject a fault if the translation VA -> IPA fails Julien Grall
2016-06-07 16:06 ` [PATCH v3 16/16] xen/arm: arm64: Document Cortex-A57 erratum 834220 Julien Grall
2016-06-14 12:15   ` Julien Grall
2016-06-22 10:08   ` Stefano Stabellini
2016-06-22 10:18     ` Julien Grall
2016-06-22 10:37       ` Stefano Stabellini [this message]

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