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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

WARNING: multiple messages have this Message-ID (diff)
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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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2023-06-05 12:05 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-09 14:22 [PATCH v2 00/11] arm64: Support for Armv8.8 memcpy instructions in userspace Kristina Martsenko
2023-05-09 14:22 ` [PATCH v2 01/11] KVM: arm64: initialize HCRX_EL2 Kristina Martsenko
2023-06-02 13:49   ` Catalin Marinas
2023-06-02 13:49     ` Catalin Marinas
2023-06-05 15:41     ` Oliver Upton
2023-06-05 15:41       ` Oliver Upton
2023-06-03  8:39   ` Marc Zyngier
2023-06-03  8:39     ` Marc Zyngier
2023-05-09 14:22 ` [PATCH v2 02/11] arm64: cpufeature: detect FEAT_HCX Kristina Martsenko
2023-05-09 14:22 ` [PATCH v2 03/11] KVM: arm64: switch HCRX_EL2 between host and guest Kristina Martsenko
2023-06-02 13:51   ` Catalin Marinas
2023-06-02 13:51     ` Catalin Marinas
2023-06-05 15:41     ` Oliver Upton
2023-06-05 15:41       ` Oliver Upton
2023-06-03  8:40   ` Marc Zyngier
2023-06-03  8:40     ` Marc Zyngier
2023-05-09 14:22 ` [PATCH v2 04/11] arm64: mops: document boot requirements for MOPS Kristina Martsenko
2023-05-09 14:22 ` [PATCH v2 05/11] arm64: mops: don't disable host MOPS instructions from EL2 Kristina Martsenko
2023-05-09 14:22 ` [PATCH v2 06/11] KVM: arm64: hide MOPS from guests Kristina Martsenko
2023-05-25 19:26   ` Colton Lewis
2023-05-25 19:26     ` Colton Lewis
2023-05-30 16:34     ` Kristina Martsenko
2023-05-30 16:34       ` Kristina Martsenko
2023-06-03  8:42   ` Marc Zyngier
2023-06-03  8:42     ` Marc Zyngier
2023-06-05 15:45     ` Oliver Upton
2023-06-05 15:45       ` Oliver Upton
2023-05-09 14:22 ` [PATCH v2 07/11] arm64: mops: handle MOPS exceptions Kristina Martsenko
2023-05-25 19:50   ` Colton Lewis
2023-05-25 19:50     ` Colton Lewis
2023-05-30 16:36     ` Kristina Martsenko
2023-05-30 16:36       ` Kristina Martsenko
2023-06-05 11:43   ` Shaoqin Huang
2023-06-05 11:43     ` Shaoqin Huang
2023-06-05 12:04     ` Catalin Marinas [this message]
2023-06-05 12:04       ` Catalin Marinas
2023-05-09 14:22 ` [PATCH v2 08/11] arm64: mops: handle single stepping after MOPS exception Kristina Martsenko
2023-05-09 14:22 ` [PATCH v2 09/11] arm64: mops: detect and enable FEAT_MOPS Kristina Martsenko
2023-05-09 14:22 ` [PATCH v2 10/11] arm64: mops: allow disabling MOPS from the kernel command line Kristina Martsenko
2023-05-09 14:22 ` [PATCH v2 11/11] kselftest/arm64: add MOPS to hwcap test Kristina Martsenko
2023-05-12  4:02   ` Mark Brown
2023-06-05 17:46 ` [PATCH v2 00/11] arm64: Support for Armv8.8 memcpy instructions in userspace Catalin Marinas
2023-06-05 17:46   ` Catalin Marinas

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