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[Xen-devel] Why call iommu_unmap_page() in set_p2m_entry()?

To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
From: "Han, Weidong" <weidong.han@xxxxxxxxx>
Date: Thu, 13 Mar 2008 21:28:54 +0800
Cc: wei.wang2@xxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Delivery-date: Thu, 13 Mar 2008 06:33:16 -0700
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
Thread-index: AciFDi7GK2Xt4JCVQxynB6N3zSTv1w==
Thread-topic: [Xen-devel] Why call iommu_unmap_page() in set_p2m_entry()?

As my understanding, AMD IOMMU doesn't share its page tables with p2m
table. So it needs call iommu_unmap_page() to free pages when shut down
or destroy domain. Now iommu_unmap_page() is only called in
set_p2m_entry(), I think it won't be executed when shut down or destroy
domain. I'm not familiar with AMD IOMMU code, maybe I missed something.
Can you explain why do that? Thanks!

Randy (Weidong) 

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