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

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Date:	Tue, 07 May 2013 13:28:51 +1000
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Alex Williamson <alex.williamson@...hat.com>
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 05/07/2013 11:42 AM, Alex Williamson wrote:
> On Tue, 2013-05-07 at 10:49 +1000, Alexey Kardashevskiy wrote:
>> On 05/07/2013 07:07 AM, Alex Williamson wrote:
>>> 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,
>>
>> Cannot find it, could you point me please where it is on github or
>> git.kernel.org? Thanks.
> 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a5bab1004729f3302c776e53ee7c895b98bb1ce


Yes, I confirm, this is patch is not need any more. Thanks!



-- 
Alexey
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