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[Xen-devel] RE: MFN & Page Mapping

from [Tian, Kevin]

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To:	"'Kumar, Venkat'" <Venkat.Kumar@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] RE: MFN & Page Mapping
From:	"Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date:	Wed, 19 Nov 2008 10:19:12 +0800
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Thread-topic:	MFN & Page Mapping

virt_to_mfn in hvm gets you gpfn, while virt_to_mfn in pv gets the real mfn. So it's expected. HVM domain can not use a mfn inside.

Thanks,

Kevin

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Kumar, Venkat
Sent: Tuesday, November 18, 2008 9:58 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] MFN & Page Mapping

When I share a page between a HVM domain (who offers the page) and a PV domain (who maps the page), I realized that the MFN (machine frame number) of the shared page in both these domains are different.

When I do virt_to_mfn on both the domains I get a different machine frame number. Is it expected or is the page really getting shared? I could see the contents of the page identical from both the domains.

Any clues?

Thx,

Venkat

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