On Mon, Aug 08, 2016 at 01:19:43PM +0200, Roger Pau Monne wrote: > On Mon, Aug 08, 2016 at 11:42:03AM +0100, Andrew Cooper wrote: > > On 08/08/16 11:21, Marek Marczykowski-Górecki wrote: > > > Hi, > > > > > > What hypercalls are available for PVH guests? > > > > First of all, be aware that there is currently some chaos in the > > codebase which is soon to be resolved. > > > > What you are looking for is HVMLite, which will likely be renamed to PVH > > once it is complete. Original PVH will then be filed in /dev/null, > > leaving only a set of lessons in git history. > > > > > How is it different for HVM guests? > > > > HVMLite guests are just HVM guests without qemu. > > > > Roger (CC'd) is leading the effort. You select an HVMLite guest by > > choosing device-model = None in the xl configuration file, rather than > > setting pvh=1 > > > > > Is it documented somewhere? > > > > There are patches on the list. > > > > Also, docs/misc/hvmlite.markdown > > > > > For example I'd expect that do_mmu_update is available only for PV > > > guests, but looking at the code I can't find anything preventing other > > > guest types from using it (no, some obscure conditions deep in execution > > > path doesn't count). > > > > HVM guests use the hvm_hypercall_table, not the hypercall tables in entry.S > > They have access to the same set of hypercalls as HVM guests, in fact the > hypercall table is shared between HVM and HVMlite guests (to become PVH, > just using HVMlite here to avoid confusion). Classic PVH guests had their > own hypercall table, but as Andrew said you should not look at those.
Thanks for the explanation. What is the current state of HVMlite? I see "none" is valid value for "device_model_version" already, but if I try to start such guest, it fails at x86_compat call (tries to boot it as PV guest). I guess it's because of missing kernel support. Is "[PATCH v2 00/11] HVMlite domU support" sent in Feb the latest version available? When it is planned to have it in vanilla kernel? -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?
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