From: Marc Zyngier <marc.zyngier@arm.com>
To: Vladimir Murzin <vladimir.murzin@arm.com>, kvmarm@lists.cs.columbia.edu
Cc: andre.przywara@arm.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 06/10] KVM: arm: vgic: Support 64-bit data manipulation on 32-bit host systems
Date: Thu, 22 Sep 2016 11:00:07 +0100 [thread overview]
Message-ID: <57E3ABA7.2060003@arm.com> (raw)
In-Reply-To: <1473691764-29424-7-git-send-email-vladimir.murzin@arm.com>
On 12/09/16 15:49, Vladimir Murzin wrote:
> We have couple of 64-bit registers defined in GICv3 architecture, so
> unsigned long accesses to these registers will only access a single
> 32-bit part of that regitser. On the other hand these registers can't
> be accessed as 64-bit with a single instruction like ldrd/strd or
> ldmia/stmia if we run a 32-bit host because KVM does not support
> access to MMIO space done by these instructions.
>
> It means that a 32-bit guest accesses these registers in 32-bit
> chunks, so the only thing we need to do is to ensure that
> extract_bytes() always takes 64-bit data.
>
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---
> virt/kvm/arm/vgic/vgic-mmio-v3.c | 2 +-
> virt/kvm/arm/vgic/vgic-mmio.h | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
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 v4 06/10] KVM: arm: vgic: Support 64-bit data manipulation on 32-bit host systems
Date: Thu, 22 Sep 2016 11:00:07 +0100 [thread overview]
Message-ID: <57E3ABA7.2060003@arm.com> (raw)
In-Reply-To: <1473691764-29424-7-git-send-email-vladimir.murzin@arm.com>
On 12/09/16 15:49, Vladimir Murzin wrote:
> We have couple of 64-bit registers defined in GICv3 architecture, so
> unsigned long accesses to these registers will only access a single
> 32-bit part of that regitser. On the other hand these registers can't
> be accessed as 64-bit with a single instruction like ldrd/strd or
> ldmia/stmia if we run a 32-bit host because KVM does not support
> access to MMIO space done by these instructions.
>
> It means that a 32-bit guest accesses these registers in 32-bit
> chunks, so the only thing we need to do is to ensure that
> extract_bytes() always takes 64-bit data.
>
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---
> virt/kvm/arm/vgic/vgic-mmio-v3.c | 2 +-
> virt/kvm/arm/vgic/vgic-mmio.h | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2016-09-22 9:51 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-12 14:49 [PATCH v4 00/10] ARM: KVM: Support for vgic-v3 Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-12 14:49 ` [PATCH v4 01/10] arm64: KVM: Use static keys for selecting the GIC backend Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:20 ` Christoffer Dall
2016-09-13 8:20 ` Christoffer Dall
2016-09-13 9:11 ` Marc Zyngier
2016-09-13 9:11 ` Marc Zyngier
2016-09-13 9:22 ` Christoffer Dall
2016-09-13 9:22 ` Christoffer Dall
2016-09-14 15:20 ` Vladimir Murzin
2016-09-14 15:20 ` Vladimir Murzin
2016-09-14 15:47 ` Marc Zyngier
2016-09-14 15:47 ` Marc Zyngier
2016-09-15 9:03 ` Christoffer Dall
2016-09-15 9:03 ` Christoffer Dall
2016-09-22 10:01 ` Marc Zyngier
2016-09-22 10:01 ` Marc Zyngier
2016-09-12 14:49 ` [PATCH v4 02/10] arm64: KVM: Move GIC accessors to arch_gicv3.h Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-12 14:49 ` [PATCH v4 03/10] arm64: KVM: Move vgic-v3 save/restore to virt/kvm/arm/hyp Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:51 ` Christoffer Dall
2016-09-13 8:51 ` Christoffer Dall
2016-09-12 14:49 ` [PATCH v4 04/10] KVM: arm64: vgic-its: Introduce config option to guard ITS specific code Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:51 ` Christoffer Dall
2016-09-13 8:51 ` Christoffer Dall
2016-09-12 14:49 ` [PATCH v4 05/10] KVM: arm: vgic: Fix compiler warnings when built for 32-bit Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:51 ` Christoffer Dall
2016-09-13 8:51 ` Christoffer Dall
2016-09-22 10:01 ` Marc Zyngier
2016-09-22 10:01 ` Marc Zyngier
2016-09-12 14:49 ` [PATCH v4 06/10] KVM: arm: vgic: Support 64-bit data manipulation on 32-bit host systems Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:51 ` Christoffer Dall
2016-09-13 8:51 ` Christoffer Dall
2016-09-22 10:00 ` Marc Zyngier [this message]
2016-09-22 10:00 ` Marc Zyngier
2016-09-12 14:49 ` [PATCH v4 07/10] ARM: Introduce MPIDR_LEVEL_SHIFT macro Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:38 ` Christoffer Dall
2016-09-13 8:38 ` Christoffer Dall
2016-09-13 9:04 ` Vladimir Murzin
2016-09-13 9:04 ` Vladimir Murzin
2016-09-13 10:12 ` Marc Zyngier
2016-09-13 10:12 ` Marc Zyngier
2016-09-13 10:32 ` Vladimir Murzin
2016-09-13 10:32 ` Vladimir Murzin
2016-09-13 10:44 ` Marc Zyngier
2016-09-13 10:44 ` Marc Zyngier
2016-09-14 15:21 ` Vladimir Murzin
2016-09-14 15:21 ` Vladimir Murzin
2016-09-14 15:50 ` Marc Zyngier
2016-09-14 15:50 ` Marc Zyngier
2016-09-22 9:59 ` Marc Zyngier
2016-09-22 9:59 ` Marc Zyngier
2016-09-12 14:49 ` [PATCH v4 08/10] ARM: Move system register accessors to asm/cp15.h Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:52 ` Christoffer Dall
2016-09-13 8:52 ` Christoffer Dall
2016-09-22 9:59 ` Marc Zyngier
2016-09-22 9:59 ` Marc Zyngier
2016-09-12 14:49 ` [PATCH v4 09/10] ARM: gic-v3: Introduce 32-to-64-bit mappings for GICv3 cpu registers Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:52 ` Christoffer Dall
2016-09-13 8:52 ` Christoffer Dall
2016-09-22 9:57 ` Marc Zyngier
2016-09-22 9:57 ` Marc Zyngier
2016-09-12 14:49 ` [PATCH v4 10/10] ARM: KVM: Support vgic-v3 Vladimir Murzin
2016-09-12 14:49 ` Vladimir Murzin
2016-09-13 8:52 ` Christoffer Dall
2016-09-13 8:52 ` Christoffer Dall
2016-09-22 9:58 ` Marc Zyngier
2016-09-22 9:58 ` Marc Zyngier
2016-09-15 9:13 ` [PATCH v4 00/10] ARM: KVM: Support for vgic-v3 Christoffer Dall
2016-09-15 9:13 ` Christoffer Dall
2016-09-15 10:33 ` Vladimir Murzin
2016-09-15 10:33 ` Vladimir Murzin
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