• Juergen Gross's avatar
    xen: switch to post-init routines in xen mmu.c earlier · cdfa0bad
    Juergen Gross authored
    With the virtual mapped linear p2m list the post-init mmu operations
    must be used for setting up the p2m mappings, as in case of
    CONFIG_FLATMEM the init routines may trigger BUGs.
    
    paging_init() sets up all infrastructure needed to switch to the
    post-init mmu ops done by xen_post_allocator_init(). With the virtual
    mapped linear p2m list we need some mmu ops during setup of this list,
    so we have to switch to the correct mmu ops as soon as possible.
    
    The p2m list is usable from the beginning, just expansion requires to
    have established the new linear mapping. So the call of
    xen_remap_memory() had to be introduced, but this is not due to the
    mmu ops requiring this.
    
    Summing it up: calling xen_post_allocator_init() not directly after
    paging_init() was conceptually wrong in the beginning, it just didn't
    matter up to now as no functions used between the two calls needed
    some critical mmu ops (e.g. alloc_pte). This has changed now, so I
    corrected it.
    Reported-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
    Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
    Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
    cdfa0bad
mmu.c 67.4 KB