Messages in this thread | | | Date | Fri, 14 Sep 2007 17:28:06 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [kvm-devel] [PATCH] Refactor hypercall infrastructure |
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Nakajima, Jun wrote: > Today, 3 CPUID leaves starting from 0x4000_0000 are defined in a generic > fashion (hypervisor detection, version, and hypercall page), and those > are the ones used by Xen today. We should extend those leaves (e.g. > starting from 0x4000_0003) for the vmm-independent features as well. > > If Xen needs additional Xen-specific features, we need to allocate some > leaves for those (e.g. 0x4000_1000)
But the signature is "XenVMMXenVMM", which isn't very generic. If we're presenting a generic interface, it needs to have a generic signature, otherwise guests will need to have a list of all hypervisor signatures supporting their interface. Since 0x40000000 has already been established as the base leaf of the hypervisor-specific interfaces, the generic interface will have to be elsewhere.
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