linux-kernel - Re: [v1 1/2] xen/p2m: Create identity mappings for PFNs beyound E820 and PCI BARs

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Date:	Mon, 28 Oct 2013 09:51:23 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Bjorn Helgaas" <bhelgaas@...gle.com>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	"David Vrabel" <david.vrabel@...rix.com>,
	<Santosh.Jodh@...rix.com>, <xhejtman@....muni.cz>,
	"xen-devel" <xen-devel@...ts.xensource.com>,
	<boris.ostrovsky@...cle.com>, <mukesh.rathor@...cle.com>,
	<yuval.shaia@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [v1 1/2] xen/p2m: Create identity mappings for PFNs
 beyound E820 and PCI BARs

>>> On 26.10.13 at 00:08, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Fri, Oct 25, 2013 at 9:03 AM, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
>> +               unsigned long pfn, start, end, ok_pfns;
>> +               char bus_addr[64];
>> +               char *fmt;
>> +
>> +               if (!pci_resource_len(pci_dev, i))
>> +                       continue;
>> +
>> +               if (pci_resource_flags(pci_dev, i) == IORESOURCE_IO)
> 
> You probably want:
> 
>     if (pci_resource_flags(pci_dev, i) & IORESOURCE_IO)
> 
> here.  And I don't understand what you're doing below, but my
> impression is you only care about MEM regions, not IO regions, so it
> seems like you might want to skip IO completely.

Yes indeed.

Jan

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