34b6f01a79
Register pfn_is_ram helper speed up reading /proc/vmcore in the kdump
kernel. See commit message of 997c136f51 ("fs/proc/vmcore.c: add hook
to read_from_oldmem() to check for non-ram pages") for details.
It makes use of a new hvmop HVMOP_get_mem_type which was introduced in
xen 4.2 (23298:26413986e6e0) and backported to 4.1.1.
The new function is currently only enabled for reading /proc/vmcore.
Later it will be used also for the kexec kernel. Since that requires
more changes in the generic kernel make it static for the time being.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __XEN_PUBLIC_HVM_HVM_OP_H__
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#define __XEN_PUBLIC_HVM_HVM_OP_H__
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/* Get/set subcommands: the second argument of the hypercall is a
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* pointer to a xen_hvm_param struct. */
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#define HVMOP_set_param 0
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#define HVMOP_get_param 1
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struct xen_hvm_param {
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domid_t domid; /* IN */
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uint32_t index; /* IN */
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uint64_t value; /* IN/OUT */
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_hvm_param);
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/* Hint from PV drivers for pagetable destruction. */
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#define HVMOP_pagetable_dying 9
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struct xen_hvm_pagetable_dying {
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/* Domain with a pagetable about to be destroyed. */
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domid_t domid;
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/* guest physical address of the toplevel pagetable dying */
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aligned_u64 gpa;
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};
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typedef struct xen_hvm_pagetable_dying xen_hvm_pagetable_dying_t;
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DEFINE_GUEST_HANDLE_STRUCT(xen_hvm_pagetable_dying_t);
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enum hvmmem_type_t {
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HVMMEM_ram_rw, /* Normal read/write guest RAM */
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HVMMEM_ram_ro, /* Read-only; writes are discarded */
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HVMMEM_mmio_dm, /* Reads and write go to the device model */
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};
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#define HVMOP_get_mem_type 15
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/* Return hvmmem_type_t for the specified pfn. */
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struct xen_hvm_get_mem_type {
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/* Domain to be queried. */
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domid_t domid;
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/* OUT variable. */
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uint16_t mem_type;
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uint16_t pad[2]; /* align next field on 8-byte boundary */
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/* IN variable. */
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uint64_t pfn;
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};
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DEFINE_GUEST_HANDLE_STRUCT(xen_hvm_get_mem_type);
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#endif /* __XEN_PUBLIC_HVM_HVM_OP_H__ */
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