Messages in this thread | | | Date | Tue, 27 Feb 2007 10:55:17 -0800 | From | Jeremy Fitzhardinge <> | Subject | Re: [patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a fixmap slot |
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Ingo Molnar wrote: > * Jeremy Fitzhardinge <jeremy@goop.org> wrote: > > >> Allocate a fixmap slot for use by a paravirt_ops implementation. Xen >> uses this to map the hypervisor's shared info page, which doesn't have >> a pseudo-physical page number, and therefore can't be mapped >> ordinarily. >> > > why not vmalloc it on the guest side? fixmaps are bad for this purpose > for a general paravirt implementation, it limits the size of the shared > info page, etc.
Yes. vmalloc would have the annoying side-effect of actually allocating some pages which would be shadowed by the remapping, but I guess get_vm_area would do the job. I'll give it a go.
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