linux-kernel - Re: [PATCH 2/5] KVM: PPC: iommu: Add missing kvm_iommu_map_pages/kvm_iommu_unmap

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Date:	Mon, 06 May 2013 15:07:16 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	aik@...abs.ru
Cc:	linuxppc-dev@...ts.ozlabs.org,
	David Gibson <david@...son.dropbear.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH 2/5] KVM: PPC: iommu: Add missing
 kvm_iommu_map_pages/kvm_iommu_unmap_pages

On Mon, 2013-05-06 at 17:21 +1000, aik@...abs.ru wrote:
> From: Alexey Kardashevskiy <aik@...abs.ru>
> 
> The IOMMU API implements groups creating/deletion, device binding
> and IOMMU map/unmap operations.
> 
> The PowerPC implementation uses most of the API except map/unmap
> operations, which are implemented on POWER using hypercalls.
> 
> However, in order to link a kernel with the CONFIG_IOMMU_API enabled,
> the empty kvm_iommu_map_pages/kvm_iommu_unmap_pages have to be
> defined, so this defines them.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> Cc: David Gibson <david@...son.dropbear.id.au>
> Signed-off-by: Paul Mackerras <paulus@...ba.org>
> ---
>  arch/powerpc/include/asm/kvm_host.h |   14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index b6a047e..c025d91 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -603,4 +603,18 @@ struct kvm_vcpu_arch {
>  
>  #define __KVM_HAVE_ARCH_WQP
>  
> +#ifdef CONFIG_IOMMU_API
> +/* POWERPC does not use IOMMU API for mapping/unmapping */
> +static inline int kvm_iommu_map_pages(struct kvm *kvm,
> +		struct kvm_memory_slot *slot)
> +{
> +	return 0;
> +}
> +
> +static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
> +		struct kvm_memory_slot *slot)
> +{
> +}
> +#endif /* CONFIG_IOMMU_API */
> +
>  #endif /* __POWERPC_KVM_HOST_H__ */

This is no longer needed, Gleb applied my patch for 3.10 that make all
of KVM device assignment dependent on a build config option and the top
level kvm_host.h now includes this when that is not set.  Thanks,

Alex

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