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From: Marc Zyngier <marc.zyngier@arm.com>
To: Mario Smarduch <m.smarduch@samsung.com>,
	"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
	"christoffer.dall@linaro.org" <christoffer.dall@linaro.org>
Cc: "linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	Catalin Marinas <Catalin.Marinas@arm.com>,
	Will Deacon <Will.Deacon@arm.com>
Subject: Re: [PATCH v2 1/2] arm64: KVM: Optimize arm64 fp/simd save/restore
Date: Thu, 18 Jun 2015 18:04:14 +0100	[thread overview]
Message-ID: <5582FA0E.6030409@arm.com> (raw)
In-Reply-To: <1434491452-19177-2-git-send-email-m.smarduch@samsung.com>

On 16/06/15 22:50, Mario Smarduch wrote:
> This patch only saves and restores FP/SIMD registers on Guest access. To do
> this cptr_el2 FP/SIMD trap is set on Guest entry and later checked on exit.
> lmbench, hackbench show significant improvements, for 30-50% exits FP/SIMD
> context is not saved/restored
> 
> Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>

Looks nice and clean.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...

WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/2] arm64: KVM: Optimize arm64 fp/simd save/restore
Date: Thu, 18 Jun 2015 18:04:14 +0100	[thread overview]
Message-ID: <5582FA0E.6030409@arm.com> (raw)
In-Reply-To: <1434491452-19177-2-git-send-email-m.smarduch@samsung.com>

On 16/06/15 22:50, Mario Smarduch wrote:
> This patch only saves and restores FP/SIMD registers on Guest access. To do
> this cptr_el2 FP/SIMD trap is set on Guest entry and later checked on exit.
> lmbench, hackbench show significant improvements, for 30-50% exits FP/SIMD
> context is not saved/restored
> 
> Signed-off-by: Mario Smarduch <m.smarduch@samsung.com>

Looks nice and clean.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...

  reply	other threads:[~2015-06-18 17:04 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-16 21:50 [PATCH v2 0/2] arm/arm64: KVM: Optimize arm64 fp/simd, saves 30-50% on exits Mario Smarduch
2015-06-16 21:50 ` Mario Smarduch
2015-06-16 21:50 ` [PATCH v2 1/2] arm64: KVM: Optimize arm64 fp/simd save/restore Mario Smarduch
2015-06-16 21:50   ` Mario Smarduch
2015-06-18 17:04   ` Marc Zyngier [this message]
2015-06-18 17:04     ` Marc Zyngier
2015-06-16 21:50 ` [PATCH v2 2/2] arm: KVM: keep arm vfp/simd exit handling consistent with arm64 Mario Smarduch
2015-06-16 21:50   ` Mario Smarduch
2015-06-18 17:27   ` Marc Zyngier
2015-06-18 17:27     ` Marc Zyngier
2015-06-18 23:49     ` Mario Smarduch
2015-06-18 23:49       ` Mario Smarduch
2015-06-19 13:50       ` Marc Zyngier
2015-06-19 13:50         ` Marc Zyngier

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