From: peter.maydell@linaro.org (Peter Maydell)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/5] arm64: kernel: Add support for User Access Override
Date: Fri, 19 Feb 2016 16:54:17 +0000 [thread overview]
Message-ID: <CAFEAcA_uAG1hX2a3n8FSJpB704wzJeXzijHSETJ2B6OR0g=nJw@mail.gmail.com> (raw)
In-Reply-To: <20160219164606.GD12864@e104818-lin.cambridge.arm.com>
On 19 February 2016 at 16:46, Catalin Marinas <catalin.marinas@arm.com> wrote:
> On Fri, Feb 19, 2016 at 03:38:44PM +0000, Peter Maydell wrote:
>> This is more of a heads-up than a demand that you Do Something,
>> but perhaps somebody has a clever idea...
>
> Only if Qemu had its own MIDR/REVIDR ;) (and patch the instruction like
> other errata workarounds).
Smiley noted, but FWIW the relevant CPUs advertise themselves as
MIDR 0x411fd070 REVIDR 0 (A57) and MIDR 0x410fd034 REVIDR 0 (A53),
and it should be harmless to patch the ID_AA64MMFR2 read to always
return 0 on any A53 or A57 including h/w, because they'll read as
zero anyway...
So it comes down to how much we want to work around QEMU "errata".
thanks
-- PMM
next prev parent reply other threads:[~2016-02-19 16:54 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-05 14:58 [PATCH v2 0/5] arm64: kernel: Add support for User Access Override James Morse
2016-02-05 14:58 ` [PATCH v2 1/5] arm64: cpufeature: Change read_cpuid() to use sysreg's mrs_s macro James Morse
2016-02-05 14:58 ` [PATCH v2 2/5] arm64: add ARMv8.2 id_aa64mmfr2 boiler plate James Morse
2016-03-03 17:59 ` Christopher Covington
2016-03-03 18:27 ` Robin Murphy
2016-03-03 19:03 ` Christopher Covington
2016-03-03 19:19 ` Will Deacon
2016-03-04 10:20 ` Suzuki K. Poulose
2016-03-04 13:37 ` James Morse
2016-03-04 13:54 ` Robin Murphy
2016-03-04 14:59 ` Mark Rutland
2016-03-04 18:15 ` Christopher Covington
2016-02-05 14:58 ` [PATCH v2 3/5] arm64: kernel: Add support for User Access Override James Morse
2016-02-18 12:26 ` Catalin Marinas
2016-02-05 14:58 ` [PATCH v2 4/5] arm64: cpufeature: Test 'matches' pointer to find the end of the list James Morse
2016-02-05 14:58 ` [PATCH v2 5/5] arm64: kernel: Don't toggle PAN on systems with UAO James Morse
2016-02-18 14:36 ` Catalin Marinas
2016-02-18 14:43 ` James Morse
2016-02-05 15:40 ` [PATCH v2 0/5] arm64: kernel: Add support for User Access Override Arnd Bergmann
2016-02-09 9:47 ` Will Deacon
2016-02-18 18:03 ` Catalin Marinas
2016-02-19 15:38 ` Peter Maydell
2016-02-19 16:46 ` Catalin Marinas
2016-02-19 16:54 ` Peter Maydell [this message]
2016-02-19 16:57 ` Ard Biesheuvel
2016-02-19 17:03 ` Peter Maydell
2016-03-07 16:43 ` James Morse
2016-03-07 17:23 ` Russell King - ARM Linux
2016-03-07 17:40 ` James Morse
2016-03-07 17:51 ` Russell King - ARM Linux
2016-03-07 17:38 ` Catalin Marinas
2016-03-07 20:54 ` Kees Cook
2016-03-08 17:19 ` Catalin Marinas
2016-03-08 17:39 ` Kees Cook
2016-03-08 18:22 ` Catalin Marinas
2016-03-08 18:27 ` Kees Cook
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