From: Dmitry Safonov <dima@arista.com>
To: Mark Rutland <mark.rutland@arm.com>, Andrei Vagin <avagin@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/6] arm64/vdso: Zap vvar pages when switching to a time namespace
Date: Tue, 16 Jun 2020 14:47:46 +0100 [thread overview]
Message-ID: <d16b5cd1-bdb1-5667-fbda-c622cc795389@arista.com> (raw)
In-Reply-To: <20200616112418.GC11780@C02TD0UTHF1T.local>
Hi Mark,
On 6/16/20 12:24 PM, Mark Rutland wrote:
> On Tue, Jun 16, 2020 at 12:55:41AM -0700, Andrei Vagin wrote:
[..]
>> Whenever a task changes its namespace, the VVAR
>> page tables are cleared and then they will be re-faulted with a
>> corresponding layout.
>
> How does this work for multi-threaded applications? Are there any
> concerns w.r.t. atomicity of the change?
Multi-threaded applications can't setns() for time namespace,
timens_install():
: if (!current_is_single_threaded())
: return -EUSERS;
Thanks,
Dmitry
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next prev parent reply other threads:[~2020-06-16 13:48 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 7:55 [PATCH v4 0/6] arm64: add the time namespace support Andrei Vagin
2020-06-16 7:55 ` [PATCH 1/6] arm64/vdso: use the fault callback to map vvar pages Andrei Vagin
2020-06-16 10:59 ` Mark Rutland
2020-06-18 7:27 ` Andrei Vagin
2020-06-16 7:55 ` [PATCH 2/6] arm64/vdso: Zap vvar pages when switching to a time namespace Andrei Vagin
2020-06-16 11:24 ` Mark Rutland
2020-06-16 13:47 ` Dmitry Safonov [this message]
2020-06-19 15:38 ` Christian Brauner
2020-06-16 7:55 ` [PATCH 3/6] arm64/vdso: Add time namespace page Andrei Vagin
2020-06-16 7:55 ` [PATCH 4/6] arm64/vdso: Handle faults on timens page Andrei Vagin
2020-06-16 7:55 ` [PATCH 5/6] arm64/vdso: Restrict splitting VVAR VMA Andrei Vagin
2020-06-16 7:55 ` [PATCH 6/6] arm64: enable time namespace support Andrei Vagin
-- strict thread matches above, loose matches on Subject: below --
2020-06-24 8:33 [PATCH v5 0/6] arm64: add the " Andrei Vagin
2020-06-24 8:33 ` [PATCH 2/6] arm64/vdso: Zap vvar pages when switching to a time namespace Andrei Vagin
2020-06-24 15:18 ` Christian Brauner
2020-06-25 8:25 ` Andrei Vagin
2020-06-02 18:02 [PATCH RESEND v3 0/6] arm64: add the time namespace support Andrei Vagin
2020-06-02 18:02 ` [PATCH 2/6] arm64/vdso: Zap vvar pages when switching to a time namespace Andrei Vagin
2020-04-16 5:26 [PATCH v3 0/6] arm64: add the time namespace support Andrei Vagin
2020-04-16 5:26 ` [PATCH 2/6] arm64/vdso: Zap vvar pages when switching to a time namespace Andrei Vagin
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