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

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Message-ID: <20100201193017.GA27065@amt.cnet>
Date:	Mon, 1 Feb 2010 17:30:17 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Joerg Roedel <joro@...tes.org>, 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 Mon, Feb 01, 2010 at 03:18:04PM +0100, Joerg Roedel wrote:
> On Fri, Jan 29, 2010 at 10:32:33AM +0100, Joerg Roedel wrote:
> > 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.
> 
> Here is the updated patch (also updated in the iommu/largepage branch of
> my tree). Does it look ok?

Yes, addresses the concern.

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