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Andrew Cooper
97e34ad22d
xc_dom_p2m() and dom->p2m_host[] implement a linear transform for translated domains, but waste a substantial chunk of RAM doing so. ARM literally never reads dom->p2m_host[] (because of the xc_dom_translated() short circuit in xc_dom_p2m()). Drop it all. x86 HVM does use dom->p2m_host[] for xc_domain_populate_physmap_exact() calls when populating 4k pages. Reuse the same tactic from 2M/1G ranges and use an on-stack array instead. Drop the memory allocation. x86 PV guests do use dom->p2m_host[] as a non-identity transform. Rename the field to pv_p2m to make it clear it is PV-only. No change in the constructed guests. Reported-by: Varad Gautam <vrd@amazon.de> Reported-by: Julien Grall <julien.grall@arm.com> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Wei Liu <wl@xen.org>