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xen: implement XENMEM_machphys_mapping

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This hypercall allows Xen to specify a non-default location for the
machine to physical mapping. This capability is used when running a 32
bit domain 0 on a 64 bit hypervisor to shrink the hypervisor hole to
exactly the size required.

[ Impact: add Xen hypercall definitions ]

Signed-off-by: Ian Campbell <[email protected]>
Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Signed-off-by: Stefano Stabellini <[email protected]>
This commit is contained in:
Ian Campbell 2010-09-30 12:37:26 +01:00 • committed by Jeremy Fitzhardinge
commit 7e77506a59
7 changed files with 47 additions and 18 deletions
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13
include/xen/interface/memory.h
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@ -140,6 +140,19 @@ struct xen_machphys_mfn_list {
};
DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
/*
* Returns the location in virtual address space of the machine_to_phys
* mapping table. Architectures which do not have a m2p table, or which do not
* map it by default into guest address space, do not implement this command.
* arg == addr of xen_machphys_mapping_t.
*/
#define XENMEM_machphys_mapping 12
struct xen_machphys_mapping {
unsigned long v_start, v_end; /* Start and end virtual addresses. */
unsigned long max_mfn; /* Maximum MFN that can be looked up. */
};
DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t);
/*
* Sets the GPFN at which a particular page appears in the specified guest's
* pseudophysical address space.