xen: Introduce the Xen mapcache
On IA32 host or IA32 PAE host, at present, generally, we can't create an HVM guest with more than 2G memory, because generally it's almost impossible for Qemu to find a large enough and consecutive virtual address space to map an HVM guest's whole physical address space. The attached patch fixes this issue using dynamic mapping based on little blocks of memory. Each call to qemu_get_ram_ptr makes a call to qemu_map_cache with the lock option, so mapcache will not unmap these ram_ptr. Blocks that do not belong to the RAM, but usually to a device ROM or to a framebuffer, are handled in a separate function. So the whole RAMBlock can be map. Signed-off-by: NJun Nakajima <jun.nakajima@intel.com> Signed-off-by: NAnthony PERARD <anthony.perard@citrix.com> Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: NAlexander Graf <agraf@suse.de>
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xen-mapcache-stub.c
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xen-mapcache.c
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xen-mapcache.h
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