From: Steve Capper <Steve.Capper@arm.com>
To: Suzuki Poulose <Suzuki.Poulose@arm.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Catalin Marinas <Catalin.Marinas@arm.com>,
Will Deacon <Will.Deacon@arm.com>,
"jcm@redhat.com" <jcm@redhat.com>,
"ard.biesheuvel@linaro.org" <ard.biesheuvel@linaro.org>,
nd <nd@arm.com>
Subject: Re: [PATCH V4 5/6] arm64: mm: introduce 52-bit userspace support
Date: Thu, 6 Dec 2018 12:26:12 +0000 [thread overview]
Message-ID: <20181206122603.GB17473@capper-debian.cambridge.arm.com> (raw)
In-Reply-To: <e1a9b147-d635-9f32-2f33-ccd689dba858@arm.com>
On Wed, Dec 05, 2018 at 06:22:27PM +0000, Suzuki K Poulose wrote:
> Hi Steve,
>
[...]
> I think we may need a check for the secondary CPUs to make sure that they have
> the 52bit support once the boot CPU has decided to use the feature and fail the
> CPU bring up (just like we do for the granule support).
>
> Suzuki
Hi Suzuki,
I have just written a patch to detect a mismatch between 52-bit VA that
is being tested now.
As 52-bit kernel VA support is coming in future, the patch checks for a
mismatch during the secondary boot path and, if one is found, prevents
the secondary from booting (and displays an error message to the user).
Cheers,
--
Steve
next prev parent reply other threads:[~2018-12-06 12:26 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 16:41 [PATCH V4 0/6] 52-bit userspace VAs Steve Capper
2018-12-05 16:41 ` [PATCH V4 1/6] mm: mmap: Allow for "high" userspace addresses Steve Capper
2018-12-05 16:41 ` [PATCH V4 2/6] arm64: mm: Introduce DEFAULT_MAP_WINDOW Steve Capper
2018-12-05 17:36 ` Catalin Marinas
2018-12-06 12:24 ` Steve Capper
2018-12-05 16:41 ` [PATCH V4 3/6] arm64: mm: Define arch_get_mmap_end, arch_get_mmap_base Steve Capper
2018-12-05 16:41 ` [PATCH V4 4/6] arm64: mm: Offset TTBR1 to allow 52-bit PTRS_PER_PGD Steve Capper
2018-12-06 11:50 ` Catalin Marinas
2018-12-06 12:27 ` Steve Capper
2018-12-05 16:41 ` [PATCH V4 5/6] arm64: mm: introduce 52-bit userspace support Steve Capper
2018-12-05 18:22 ` Suzuki K Poulose
2018-12-06 12:26 ` Steve Capper [this message]
2018-12-06 14:35 ` Suzuki K Poulose
2018-12-06 14:52 ` Steve Capper
2018-12-05 16:41 ` [PATCH V4 6/6] arm64: mm: Allow forcing all userspace addresses to 52-bit Steve Capper
2018-12-06 11:51 ` Catalin Marinas
2018-12-06 12:28 ` Steve Capper
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