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

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Message-ID: <20100129093233.GU17809@8bytes.org>
Date:	Fri, 29 Jan 2010 10:32:33 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Joerg Roedel <joerg.roedel@....com>, Avi Kivity <avi@...hat.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 Thu, Jan 28, 2010 at 08:24:55PM -0200, Marcelo Tosatti wrote:
> On Thu, Jan 28, 2010 at 12:37:57PM +0100, Joerg Roedel wrote:
> > +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?

Right. But that was broken even before this patch. Anyway, I will fix
it.

> > +		/* Map into IO address space */
> > +		r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
> > +			      get_order(page_size), flags);
> > +
> > +		gfn += page_size >> PAGE_SHIFT;
> 
> Should increase gfn after checking for failure, otherwise wrong
> npages is passed to kvm_iommu_put_pages.

True. Will fix that too.

Thanks,

	Joerg
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