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Re: [Xen-devel] Tracking guest pages modified by qemu-dm / backend
| To: | Tim Deegan <Tim.Deegan@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Tracking guest pages modified by qemu-dm / backend |
| From: | AP <apxeng@xxxxxxxxx> |
| Date: | Thu, 23 Jun 2011 11:06:28 -0700 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 23 Jun 2011 11:07:29 -0700 |
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On Wed, Jun 22, 2011 at 1:49 AM, Tim Deegan <Tim.Deegan@xxxxxxxxxx> wrote: > 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. >From what I see for EPT/HAP, log dirty is turned on only during domain save. Is that true or am I missing something. Plus how does dirty tracking occur with EPT since those tables don't have a dirty bit? Is it using the log_dirty_bitmap? Thanks, AP _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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