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From: Oliver Upton <oliver.upton@linux.dev>
To: Marc Zyngier <maz@kernel.org>
Cc: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>, Will Deacon <will@kernel.org>
Subject: Re: [PATCH v2 4/5] KVM: arm64: vhe: Synchronise with page table walker on MMU update
Date: Thu, 13 Apr 2023 00:11:19 +0000	[thread overview]
Message-ID: <ZDdIp3j1r5ym4nb4@linux.dev> (raw)
In-Reply-To: <20230408160427.10672-5-maz@kernel.org>

On Sat, Apr 08, 2023 at 05:04:26PM +0100, Marc Zyngier wrote:
> Contrary to nVHE, VHE is a lot easier when it comes to dealing
> with speculative page table walks started at EL1. As we only change
> EL1&0 translation regime when context-switching, we already benefit
> from the effect of the DSB that sits in the context switch code.
> 
> We only need to take care of it in the NV case, where we can
> flip between between two EL1 contexts (one of them being the virtual
> EL2) without a context switch.
> 
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>

-- 
Thanks,
Oliver

WARNING: multiple messages have this Message-ID (diff)
From: Oliver Upton <oliver.upton@linux.dev>
To: Marc Zyngier <maz@kernel.org>
Cc: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>, Will Deacon <will@kernel.org>
Subject: Re: [PATCH v2 4/5] KVM: arm64: vhe: Synchronise with page table walker on MMU update
Date: Thu, 13 Apr 2023 00:11:19 +0000	[thread overview]
Message-ID: <ZDdIp3j1r5ym4nb4@linux.dev> (raw)
In-Reply-To: <20230408160427.10672-5-maz@kernel.org>

On Sat, Apr 08, 2023 at 05:04:26PM +0100, Marc Zyngier wrote:
> Contrary to nVHE, VHE is a lot easier when it comes to dealing
> with speculative page table walks started at EL1. As we only change
> EL1&0 translation regime when context-switching, we already benefit
> from the effect of the DSB that sits in the context switch code.
> 
> We only need to take care of it in the NV case, where we can
> flip between between two EL1 contexts (one of them being the virtual
> EL2) without a context switch.
> 
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>

-- 
Thanks,
Oliver

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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2023-04-13  0:11 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-08 16:04 [PATCH v2 0/5] KVM: arm64: Synchronise speculative page table walks on translation regime change Marc Zyngier
2023-04-08 16:04 ` Marc Zyngier
2023-04-08 16:04 ` [PATCH v2 1/5] KVM: arm64: nvhe: Synchronise with page table walker on vcpu run Marc Zyngier
2023-04-08 16:04   ` Marc Zyngier
2023-04-13  0:10   ` Oliver Upton
2023-04-13  0:10     ` Oliver Upton
2023-04-08 16:04 ` [PATCH v2 2/5] KVM: arm64: nvhe: Synchronise with page table walker on TLBI Marc Zyngier
2023-04-08 16:04   ` Marc Zyngier
2023-04-13  0:09   ` Oliver Upton
2023-04-13  0:09     ` Oliver Upton
2023-04-13  7:37     ` Marc Zyngier
2023-04-13  7:37       ` Marc Zyngier
2023-04-08 16:04 ` [PATCH v2 3/5] KVM: arm64: pkvm: Document the side effects of kvm_flush_dcache_to_poc() Marc Zyngier
2023-04-08 16:04   ` Marc Zyngier
2023-04-13  0:10   ` Oliver Upton
2023-04-13  0:10     ` Oliver Upton
2023-04-08 16:04 ` [PATCH v2 4/5] KVM: arm64: vhe: Synchronise with page table walker on MMU update Marc Zyngier
2023-04-08 16:04   ` Marc Zyngier
2023-04-13  0:11   ` Oliver Upton [this message]
2023-04-13  0:11     ` Oliver Upton
2023-04-08 16:04 ` [PATCH v2 5/5] KVM: arm64: vhe: Drop extra isb() on guest exit Marc Zyngier
2023-04-08 16:04   ` Marc Zyngier
2023-04-13  0:15   ` Oliver Upton
2023-04-13  0:15     ` Oliver Upton

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