Andrew Cooper 97e34ad22d tools/dombuilder: Don't allocate dom->p2m_host[] for translated domains ...

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>

2020-01-07 12:46:03 +00:00

..

xc_dom.h

tools/dombuilder: Don't allocate dom->p2m_host[] for translated domains

2020-01-07 12:46:03 +00:00

xenctrl_compat.h

x86/domctl: remove XEN_DOMCTL_pin_mem_cacheattr

2018-01-25 12:26:55 +01:00

xenctrl.h

tools/libxc: Drop unused xc_compression_*()

2019-12-20 16:08:00 +00:00

xenguest.h

tools/save: Drop unused parameters from xc_domain_save()

2020-01-07 12:26:45 +00:00