Today when a domain unpopulates the memory on runtime, they will always hand the memory over to the heap allocator. And it will be a problem if it is a static domain. Pages as guest RAM for static domain shall always be reserved to only this domain and not be used for any other purposes, so they shall never go back to heap allocator.
This patch serie intends to fix this issue, by adding pages on the new list resv_page_list after having taken them off the "normal" list, when unpopulating memory, and retrieving pages from resv page list(resv_page_list) when populating memory. --- v2 changes: - let "flags" live in the struct domain. So other arch can take advantage of it in the future - change name from "is_domain_on_static_allocation" to "is_domain_static()" - put reserved pages on resv_page_list after having taken them off the "normal" list - introduce acquire_reserved_page to retrieve reserved pages from resv_page_list - forbid non-zero-order requests in populate_physmap - let is_domain_static return ((void)(d), false) on x86 - fix coding style Penny Zheng (6): xen/arm: do not free reserved memory into heap xen/arm: do not merge reserved pages in free_heap_pages() xen: add field "flags" to cover all internal CDF_XXX xen/arm: introduce CDF_staticmem xen/arm: unpopulate memory when domain is static xen/arm: retrieve reserved pages on populate_physmap xen/arch/arm/domain.c | 2 -- xen/arch/arm/domain_build.c | 5 +++- xen/arch/arm/include/asm/domain.h | 5 ++-- xen/arch/arm/include/asm/mm.h | 17 +++++++++++++ xen/common/domain.c | 7 ++++++ xen/common/memory.c | 29 ++++++++++++++++++++++ xen/common/page_alloc.c | 40 +++++++++++++++++++++++++++++-- xen/include/xen/domain.h | 2 ++ xen/include/xen/mm.h | 1 + xen/include/xen/sched.h | 9 +++++++ 10 files changed, 110 insertions(+), 7 deletions(-) -- 2.25.1
