From: Julien Grall <julien.grall@arm.com>
To: Stefano Stabellini <sstabellini@kernel.org>
Cc: andre.przywara@arm.com, 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 11:18:40 +0100 [thread overview]
Message-ID: <576A6600.6000504@arm.com> (raw)
In-Reply-To: <alpine.DEB.2.10.1606221107000.2575@sstabellini-ThinkPad-X260>
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.
Regards,
--
Julien Grall
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next prev parent reply other threads:[~2016-06-22 10:18 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 [this message]
2016-06-22 10:37 ` Stefano Stabellini
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