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https://github.com/torvalds/linux
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0930bba674
If we want to use granted pages for AIO, changing the mappings of a user vma and the corresponding p2m is not enough, we also need to update the kernel mappings accordingly. Currently this is only needed for pages that are created for user usages through /dev/xen/gntdev. As in, pages that have been in use by the kernel and use the P2M will not need this special mapping. However there are no guarantees that in the future the kernel won't start accessing pages through the 1:1 even for internal usage. In order to avoid the complexity of dealing with highmem, we allocated the pages lowmem. We issue a HYPERVISOR_grant_table_op right away in m2p_add_override and we remove the mappings using another HYPERVISOR_grant_table_op in m2p_remove_override. Considering that m2p_add_override and m2p_remove_override are called once per page we use multicalls and hypercall batching. Use the kmap_op pointer directly as argument to do the mapping as it is guaranteed to be present up until the unmapping is done. Before issuing any unmapping multicalls, we need to make sure that the mapping has already being done, because we need the kmap->handle to be set correctly. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> [v1: Removed GRANT_FRAME_BIT usage] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> |
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| .. | ||
| interface | ||
| balloon.h | ||
| events.h | ||
| evtchn.h | ||
| features.h | ||
| gntalloc.h | ||
| gntdev.h | ||
| grant_table.h | ||
| hvc-console.h | ||
| hvm.h | ||
| Kbuild | ||
| page.h | ||
| platform_pci.h | ||
| privcmd.h | ||
| swiotlb-xen.h | ||
| tmem.h | ||
| xen-ops.h | ||
| xen.h | ||
| xenbus.h | ||
| xencomm.h | ||