From: "Waseem, Amna" <a.waseem@campus.tu-berlin.de>
To: Julien Grall <julien.grall@arm.com>
Cc: xen-devel <xen-devel@lists.xenproject.org>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Confused about mapped pages "struct page" updates
Date: Mon, 6 Nov 2017 09:57:41 +0000 [thread overview]
Message-ID: <1509962327509.94629@campus.tu-berlin.de> (raw)
In-Reply-To: <1502372917034.35589@campus.tu-berlin.de>
Hello All,
I am a little confused about mapping mechanism in Xen for page from DomU to Dom0.
When Dom0 maps DomU page to its applied host_addr, Page table entries are created by Xen hypervisor for mapping applied host_addr vritual address of Dom0 to DomU physical page. The result is host_addr maps to DomU phsyical page.
Now in network backend driver, virt_to_page macro is called on this mapped host_addr. How does Dom0 gets struct page for the mapped DomU page in its domain? Is Xen also updates mem_map array of Dom0 to create struct page for the mapped page? Or Dom0 creates struct page for all the physical memory including provided to DomU during its creation ?
Can anybody tell me how struct page for mapped pages from another domain gets updated or created in DOm0?
Any help will be appreciated
Thanks
Amna
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next prev parent reply other threads:[~2017-11-06 9:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-10 13:47 Xen Grant table frames for granting access permissions Waseem, Amna
2017-11-06 9:57 ` Waseem, Amna [this message]
2017-11-06 10:24 ` Confused about mapped pages "struct page" updates Juergen Gross
2017-11-06 10:29 ` Waseem, Amna
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