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Re: [Xen-devel] [PATCH: IOEMU & XEN] Change ioreq layout and reduce its
| To: | "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH: IOEMU & XEN] Change ioreq layout and reduce its size |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Thu, 29 Oct 2009 13:58:38 +0000 |
| Cc: | Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> |
| Delivery-date: | Thu, 29 Oct 2009 06:59:18 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH: IOEMU & XEN] Change ioreq layout and reduce its size |
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On 29/10/2009 13:21, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> wrote: >> Reduce size of Xen-qemu shared ioreq structure to 32 bytes. This has >> two advantages: > > Hi, Keir, > Reduce the ioreq structure has these advantages indeed, but do we need to > consider the following compatibility issues? Thanks! > 1) HVM guest could migrate/save/restore between the new and old hypervisor if > vcpu number is less than 32. It still can, as the ioreq struct is private to the hypervisor and qemu, neither of which is migrated/saved with the guest. > 2) Old qemu could work with new hypervisor if guest vcpu number is less than > 32. Qemu, like the toolstack, is expected to be upgraded with the hypervisor. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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