From: Catalin Marinas <catalin.marinas@arm.com>
To: Shaoqin Huang <shahuang@redhat.com>
Cc: Kristina Martsenko <kristina.martsenko@arm.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Mark Rutland <mark.rutland@arm.com>,
Mark Brown <broonie@kernel.org>,
Luis Machado <luis.machado@arm.com>,
Vladimir Murzin <vladimir.murzin@arm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 07/11] arm64: mops: handle MOPS exceptions
Date: Mon, 5 Jun 2023 13:04:59 +0100 [thread overview]
Message-ID: <ZH3Pa/Ct3XX613Yj@arm.com> (raw)
In-Reply-To: <628463d5-b9df-51bd-8e1f-b0a41a928d85@redhat.com>
On Mon, Jun 05, 2023 at 07:43:27PM +0800, Shaoqin Huang wrote:
> Hi Kristina,
>
> On 5/9/23 22:22, Kristina Martsenko wrote:
> > The memory copy/set instructions added as part of FEAT_MOPS can take an
> > exception (e.g. page fault) part-way through their execution and resume
> > execution afterwards.
> >
> > If however the task is re-scheduled and execution resumes on a different
> > CPU, then the CPU may take a new type of exception to indicate this.
> > This is because the architecture allows two options (Option A and Option
> > B) to implement the instructions and a heterogeneous system can have
> > different implementations between CPUs.
> >
> > In this case the OS has to reset the registers and restart execution
> > from the prologue instruction. The algorithm for doing this is provided
> > as part of the Arm ARM.
>
> What is the Arm ARM? I'm not quite understand it.
The Arm Architecture Reference Manual:
https://developer.arm.com/documentation/ddi0487/latest
(the acronym we pretty well known among the arm/arm64 developers)
--
Catalin
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next prev parent reply other threads:[~2023-06-05 12:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230509142235.3284028-1-kristina.martsenko@arm.com>
[not found] ` <20230509142235.3284028-2-kristina.martsenko@arm.com>
2023-06-02 13:49 ` [PATCH v2 01/11] KVM: arm64: initialize HCRX_EL2 Catalin Marinas
2023-06-05 15:41 ` Oliver Upton
2023-06-03 8:39 ` Marc Zyngier
[not found] ` <20230509142235.3284028-4-kristina.martsenko@arm.com>
2023-06-02 13:51 ` [PATCH v2 03/11] KVM: arm64: switch HCRX_EL2 between host and guest Catalin Marinas
2023-06-05 15:41 ` Oliver Upton
2023-06-03 8:40 ` Marc Zyngier
[not found] ` <20230509142235.3284028-7-kristina.martsenko@arm.com>
2023-05-25 19:26 ` [PATCH v2 06/11] KVM: arm64: hide MOPS from guests Colton Lewis
2023-05-30 16:34 ` Kristina Martsenko
2023-06-03 8:42 ` Marc Zyngier
2023-06-05 15:45 ` Oliver Upton
[not found] ` <20230509142235.3284028-8-kristina.martsenko@arm.com>
2023-05-25 19:50 ` [PATCH v2 07/11] arm64: mops: handle MOPS exceptions Colton Lewis
2023-05-30 16:36 ` Kristina Martsenko
2023-06-05 11:43 ` Shaoqin Huang
2023-06-05 12:04 ` Catalin Marinas [this message]
2023-06-05 17:46 ` [PATCH v2 00/11] arm64: Support for Armv8.8 memcpy instructions in userspace Catalin Marinas
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