IIRC Xen 32 bit PV domU support was origianally added to mainline in the 2.6.22 or 23 release and 64 bit support was added in 2.6.27.The "native guest support as of 2.6.36" referred to in the parent was the addition of PV driver support (e.g. for disk and network devices) when running in a fully virtualised (AKA HVM) guest. Fully virtualised guests worked fine before then but with emulated devices.
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IIRC Xen 32 bit PV domU support was origianally added to mainline in the 2.6.22 or 23 release and 64 bit support was added in 2.6.27.The "native guest support as of 2.6.36" referred to in the parent was the addition of PV driver support (e.g. for disk and network devices) when running in a fully virtualised (AKA HVM) guest. Fully virtualised guests worked fine before then but with emulated devices.