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    xen/setup: update VA mapping when releasing memory during setup · 83d51ab4
    David Vrabel 提交于
    In xen_memory_setup(), if a page that is being released has a VA
    mapping this must also be updated.  Otherwise, the page will be not
    released completely -- it will still be referenced in Xen and won't be
    freed util the mapping is removed and this prevents it from being
    reallocated at a different PFN.
    
    This was already being done for the ISA memory region in
    xen_ident_map_ISA() but on many systems this was omitting a few pages
    as many systems marked a few pages below the ISA memory region as
    reserved in the e820 map.
    
    This fixes errors such as:
    
    (XEN) page_alloc.c:1148:d0 Over-allocation for domain 0: 2097153 > 2097152
    (XEN) memory.c:133:d0 Could not allocate order=0 extent: id=0 memflags=0 (0 of 17)
    Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
    Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    83d51ab4
mmu.c 57.1 KB