From: Steven Price <steven.price@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Peter Maydell <peter.maydell@linaro.org>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Andrew Jones <drjones@redhat.com>, Haibo Xu <Haibo.Xu@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
qemu-devel@nongnu.org, Marc Zyngier <maz@kernel.org>,
Juan Quintela <quintela@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
linux-kernel@vger.kernel.org, Dave Martin <Dave.Martin@arm.com>,
James Morse <james.morse@arm.com>,
linux-arm-kernel@lists.infradead.org,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu,
Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: Re: [PATCH v14 2/8] arm64: Handle MTE tags zeroing in __alloc_zeroed_user_highpage()
Date: Wed, 9 Jun 2021 09:56:43 +0100 [thread overview]
Message-ID: <7a3f14de-211b-94f9-6886-393d233193d5@arm.com> (raw)
In-Reply-To: <20210607170714.GA17957@arm.com>
On 07/06/2021 18:07, Catalin Marinas wrote:
> On Mon, Jun 07, 2021 at 12:08:10PM +0100, Steven Price wrote:
>> From: Catalin Marinas <catalin.marinas@arm.com>
>>
>> Currently, on an anonymous page fault, the kernel allocates a zeroed
>> page and maps it in user space. If the mapping is tagged (PROT_MTE),
>> set_pte_at() additionally clears the tags under a spinlock to avoid a
>> race on the page->flags. In order to optimise the lock, clear the page
>> tags on allocation in __alloc_zeroed_user_highpage() if the vma flags
>> have VM_MTE set.
>>
>> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
>> Signed-off-by: Steven Price <steven.price@arm.com>
>
> I think you can drop this patch now that Peter's series has been queued
> via the arm64 tree:
>
> https://lore.kernel.org/r/20210602235230.3928842-4-pcc@google.com
>
Thanks for the heads up - I hadn't seen that land. I'll drop this patch
from the next posting.
Steve
next prev parent reply other threads:[~2021-06-09 8:58 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 11:08 [PATCH v14 0/8] MTE support for KVM guest Steven Price
2021-06-07 11:08 ` [PATCH v14 1/8] arm64: mte: Handle race when synchronising tags Steven Price
2021-06-09 10:30 ` Marc Zyngier
2021-06-09 10:51 ` Steven Price
2021-06-09 11:19 ` Marc Zyngier
2021-06-09 17:41 ` Catalin Marinas
2021-06-10 8:05 ` Steven Price
2021-06-10 14:07 ` Catalin Marinas
2021-06-07 11:08 ` [PATCH v14 2/8] arm64: Handle MTE tags zeroing in __alloc_zeroed_user_highpage() Steven Price
2021-06-07 17:07 ` Catalin Marinas
2021-06-09 8:56 ` Steven Price [this message]
2021-06-07 11:08 ` [PATCH v14 3/8] arm64: mte: Sync tags for pages where PTE is untagged Steven Price
2021-06-07 11:08 ` [PATCH v14 4/8] KVM: arm64: Introduce MTE VM feature Steven Price
2021-06-07 11:08 ` [PATCH v14 5/8] KVM: arm64: Save/restore MTE registers Steven Price
2021-06-07 11:08 ` [PATCH v14 6/8] KVM: arm64: Expose KVM_ARM_CAP_MTE Steven Price
2021-06-07 11:08 ` [PATCH v14 7/8] KVM: arm64: ioctl to fetch/store tags in a guest Steven Price
2021-06-07 17:21 ` Catalin Marinas
2021-06-07 11:08 ` [PATCH v14 8/8] KVM: arm64: Document MTE capability and ioctl Steven Price
2021-06-07 17:32 ` Catalin Marinas
2021-06-09 8:56 ` Steven Price
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