linux-kernel - Re: [PATCH 7/7] KVM: arm: implement kvm_set

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Message-ID: <5595706C.9010108@arm.com>
Date:	Thu, 2 Jul 2015 18:10:04 +0100
From:	Andre Przywara <andre.przywara@....com>
To:	Eric Auger <eric.auger@...aro.org>,
	"eric.auger@...com" <eric.auger@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"p.fedin@...sung.com" <p.fedin@...sung.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH 7/7] KVM: arm: implement kvm_set_msi by gsi direct mapping

Hi Eric,

On 29/06/15 16:37, Eric Auger wrote:
> If the ITS modality is not available, let's simply support MSI
> injection by transforming the MSI.data into an SPI ID.
> 
> This becomes possible to use KVM_SIGNAL_MSI ioctl for arm too.
> 
> Signed-off-by: Eric Auger <eric.auger@...aro.org>
> ---
>  arch/arm/kvm/Kconfig | 1 +
>  virt/kvm/arm/vgic.c  | 5 +++++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
> index 151e710..0f58baf 100644
> --- a/arch/arm/kvm/Kconfig
> +++ b/arch/arm/kvm/Kconfig
> @@ -31,6 +31,7 @@ config KVM
>  	select KVM_VFIO
>  	select HAVE_KVM_EVENTFD
>  	select HAVE_KVM_IRQFD
> +	select HAVE_KVM_MSI
>  	select HAVE_KVM_IRQCHIP
>  	select HAVE_KVM_IRQ_ROUTING
>  	depends on ARM_VIRT_EXT && ARM_LPAE && ARM_ARCH_TIMER
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index 0b4c48c..b3c10dc 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -2314,6 +2314,11 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
>  			return kvm->arch.vgic.vm_ops.inject_msi(kvm, &msi);
>  		else
>  			return -ENODEV;
> +	case KVM_IRQ_ROUTING_MSI:
> +		if (kvm->arch.vgic.vm_ops.inject_msi)
> +			return -EINVAL;
> +		else
> +			return kvm_vgic_inject_irq(kvm, 0, e->msi.data, level);

If you add:

static int vgic_v2m_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
{
	return kvm_vgic_inject_irq(kvm, 0, msi->data, 1);
}

to vgic-v2-emul.c and wire it up accordingly, you can simplify the above
kvm_set_msi, getting rid of all those extra case handling.
This also helps merging KVM_IRQ_ROUTING_MSI and the extended case.

I have hacked this up and it seems to work for me.

Cheers,
Andre.
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