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Re: [Xen-devel] Tracking guest pages modified by qemu-dm / backend
| To: | AP <apxeng@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Tracking guest pages modified by qemu-dm / backend |
| From: | Tim Deegan <Tim.Deegan@xxxxxxxxxx> |
| Date: | Wed, 22 Jun 2011 09:49:53 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Wed, 22 Jun 2011 01:50:52 -0700 |
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Hi, At 15:43 -0700 on 21 Jun (1308671006), AP wrote: > Consider an HVM domain with EPT. When qemu-dm, backend or any other > device model modifies DomU memory (like on a disk read or packet > received), how does Xen track the pages that have been modified? For > example, when an DomU is being migrated while IO is occurring. Backends use grant tables to map guest memory; the granted pages are marked dirty when the backend disconnects. Qemu-dm uses the HVMOP_modified memory hypercall to tell Xen that it's written to the guest's memory. Tim. -- Tim Deegan <Tim.Deegan@xxxxxxxxxx> Principal Software Engineer, Xen Platform Team Citrix Systems UK Ltd. (Company #02937203, SL9 0BG) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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