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From: marc.zyngier@arm•com (Marc Zyngier)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v3 05/14] ARM: KVM: vgic mmio should hold data as LE bytes array in BE case
Date: Tue, 27 May 2014 16:07:50 +0100	[thread overview]
Message-ID: <5384AA46.7050304@arm.com> (raw)
In-Reply-To: <1399997646-4716-6-git-send-email-victor.kamensky@linaro.org>

On 13/05/14 17:13, Victor Kamensky wrote:
> According to recent clarifications of mmio.data array meaning -
> the mmio.data array should hold bytes as they would appear in
> memory. Vgic is little endian device. And in case of BE image
> kernel side that emulates vgic, holds data in BE form. So we
> need to byteswap cpu<->le32 vgic registers when we read/write them
> from mmio.data[].
> 
> Change has no effect in LE case because cpu already runs in le32.
> 
> Signed-off-by: Victor Kamensky <victor.kamensky@linaro•org>
> Reviewed-by: Christoffer Dall <christoffer.dall@linaro•org>
> ---
>  virt/kvm/arm/vgic.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index 56ff9be..529c336 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -241,12 +241,12 @@ static void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
>  
>  static u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
>  {
> -	return *((u32 *)mmio->data) & mask;
> +	return le32_to_cpu(*((u32 *)mmio->data)) & mask;
>  }
>  
>  static void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value)
>  {
> -	*((u32 *)mmio->data) = value & mask;
> +	*((u32 *)mmio->data) = cpu_to_le32(value) & mask;
>  }
>  
>  /**
> 

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

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

  reply	other threads:[~2014-05-27 15:07 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-13 16:13 [PATCH v3 00/14] ARM/ARM64: KVM: big endian host support Victor Kamensky
2014-05-13 16:13 ` [PATCH v3 01/14] ARM: KVM: switch hypervisor into BE mode in case of BE host Victor Kamensky
2014-05-27 14:23   ` Marc Zyngier
2014-05-13 16:13 ` [PATCH v3 02/14] ARM: KVM: fix vgic V7 assembler code to work in BE image Victor Kamensky
2014-05-27 14:24   ` Marc Zyngier
2014-05-13 16:13 ` [PATCH v3 03/14] ARM: KVM: handle 64bit values passed to mrcc or from mcrr instructions in BE case Victor Kamensky
2014-05-26 15:28   ` Christoffer Dall
2014-05-28  6:09     ` Victor Kamensky
2014-05-27 14:30   ` Marc Zyngier
2014-05-13 16:13 ` [PATCH v3 04/14] ARM: KVM: __kvm_vcpu_run function return result fix " Victor Kamensky
2014-05-27 15:02   ` Marc Zyngier
2014-05-28  6:10     ` Victor Kamensky
2014-05-13 16:13 ` [PATCH v3 05/14] ARM: KVM: vgic mmio should hold data as LE bytes array " Victor Kamensky
2014-05-27 15:07   ` Marc Zyngier [this message]
2014-05-13 16:13 ` [PATCH v3 06/14] ARM: KVM: MMIO support BE host running LE code Victor Kamensky
2014-05-27 15:49   ` Marc Zyngier
2014-05-13 16:13 ` [PATCH v3 07/14] ARM: KVM: one_reg coproc set and get BE fixes Victor Kamensky
2014-05-25 19:14   ` Christoffer Dall
2014-05-28  6:19     ` Victor Kamensky
2014-05-28  8:03       ` Christoffer Dall
2014-05-27 18:22   ` Marc Zyngier
2014-05-28  6:23     ` Victor Kamensky
2014-05-13 16:14 ` [PATCH v3 08/14] ARM: KVM: enable KVM in Kconfig on big-endian systems Victor Kamensky
2014-05-13 16:14 ` [PATCH v3 09/14] ARM64: KVM: MMIO support BE host running LE code Victor Kamensky
2014-05-27 18:25   ` Marc Zyngier
2014-05-13 16:14 ` [PATCH v3 10/14] ARM64: KVM: store kvm_vcpu_fault_info est_el2 as word Victor Kamensky
2014-05-27 18:34   ` Marc Zyngier
2014-05-13 16:14 ` [PATCH v3 11/14] ARM64: KVM: fix vgic_bitmap_get_reg function for BE 64bit case Victor Kamensky
2014-05-26 15:49   ` Christoffer Dall
2014-05-13 16:14 ` [PATCH v3 12/14] ARM64: KVM: vgic_elrsr and vgic_eisr need to be byteswapped in BE case Victor Kamensky
2014-05-26 17:35   ` Christoffer Dall
2014-05-27 19:11     ` Marc Zyngier
2014-05-13 16:14 ` [PATCH v3 13/14] ARM64: KVM: set and get of sys registers " Victor Kamensky
2014-05-14  8:45   ` Marc Zyngier
2014-05-14 14:18     ` Victor Kamensky
2014-05-25 18:26       ` Christoffer Dall
2014-05-13 16:14 ` [PATCH v3 14/14] ARM64: KVM: fix big endian issue in access_vm_reg for 32bit guest Victor Kamensky
2014-05-26 17:52   ` Christoffer Dall
2014-05-28  6:11     ` Victor Kamensky
2014-05-28  9:14       ` Christoffer Dall
2014-05-28 13:56         ` Victor Kamensky
2014-05-28 14:09           ` Christoffer Dall
2014-05-28 14:20             ` Marc Zyngier
2014-05-26 15:49 ` [PATCH v3 00/14] ARM/ARM64: KVM: big endian host support Christoffer Dall
2014-05-28  6:31   ` Victor Kamensky
2014-05-28  8:12     ` Christoffer Dall

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