linux-kernel - Re: [PATCH 06/11] kvm: Change kvm_iommu_map

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Message-ID: <4B6EAF8B.9090707@redhat.com>
Date:	Sun, 07 Feb 2010 14:18:19 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Joerg Roedel <joerg.roedel@....com>,
	David Woodhouse <dwmw2@...radead.org>, kvm@...r.kernel.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/11] kvm: Change kvm_iommu_map_pages to map large pages

On 01/29/2010 12:24 AM, Marcelo Tosatti wrote:
> On Thu, Jan 28, 2010 at 12:37:57PM +0100, Joerg Roedel wrote:
>    
>> This patch changes the implementation of of
>> kvm_iommu_map_pages to map the pages with the host page size
>> into the io virtual address space.
>>
>> Signed-off-by: Joerg Roedel<joerg.roedel@....com>
>> ---
>>   virt/kvm/iommu.c |  106 ++++++++++++++++++++++++++++++++++++++++++-----------
>>   1 files changed, 84 insertions(+), 22 deletions(-)
>>
>> diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
>> index 65a5143..92a434d 100644
>> --- a/virt/kvm/iommu.c
>> +++ b/virt/kvm/iommu.c
>> @@ -32,12 +32,27 @@ static int kvm_iommu_unmap_memslots(struct kvm *kvm);
>>   static void kvm_iommu_put_pages(struct kvm *kvm,
>>   				gfn_t base_gfn, unsigned long npages);
>>
>> +static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
>> +			   gfn_t gfn, unsigned long size)
>> +{
>> +	gfn_t end_gfn;
>> +	pfn_t pfn;
>> +
>> +	pfn     = gfn_to_pfn_memslot(kvm, slot, gfn);
>>      
> If gfn_to_pfn_memslot returns pfn of bad_page, you might create a
> large iommu translation for it?
>    

How could it return a bad_page?  The whole thing is called for a valid slot.

-- 
error compiling committee.c: too many arguments to function

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