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Re: [Xen-devel] [PATCH 1/9] Add cpu idle pwr mgmt to xen
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH 1/9] Add cpu idle pwr mgmt to xen |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Wed, 30 Apr 2008 13:27:33 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, Gang Wei <gang.wei@xxxxxxxxx> |
| Delivery-date: | Thu, 01 May 2008 07:57:08 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH 1/9] Add cpu idle pwr mgmt to xen |
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Okay, it's fair to say that any changes we make need careful checking of all existing compat shims then. :-) This is all a bit orthogonal to the issues in the Cx patchset. -- Keir On 30/4/08 11:25, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: >>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 30.04.08 12:00 >>> >> Yes, I don't think we do partial copying anywhere right now. If we did, we >> could apply guest_handle_okay() checks explicitly before removing the >> addr-space limitation. > > XENMEM_set_memory_map is one example where we do (valid here > because the E820 layout is identical for 32- and 64-bits). > >> On the other hand, I don't think we have any hypercall right now where 4kB >> is likely to be too little space, and where the hypercall cannot be >> sub-divided into smaller chunks by the compat shim. > > XENMEM_exchange and GNTTABOP_setup_table are examples for this. > > Jan > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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