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| author | Olaf Hering <olaf@aepfle.de> | 2012-10-01 21:18:01 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-10-04 11:30:30 -0400 |
| commit | 34b6f01a79bd65fbd06511d2cb7b28e33a506246 (patch) | |
| tree | 68adb1dad56bf5e11971a8344e4d3cbb09052a54 /include/xen | |
| parent | 9b6934a3b449266850149b717597408354039e95 (diff) | |
| download | linux-next-34b6f01a79bd65fbd06511d2cb7b28e33a506246.tar.gz | |
xen pv-on-hvm: add pfn_is_ram helper for kdump
Register pfn_is_ram helper speed up reading /proc/vmcore in the kdump
kernel. See commit message of 997c136f518c ("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>
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/interface/hvm/hvm_op.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/xen/interface/hvm/hvm_op.h b/include/xen/interface/hvm/hvm_op.h index a4827f46ee97..956a04682865 100644 --- a/include/xen/interface/hvm/hvm_op.h +++ b/include/xen/interface/hvm/hvm_op.h @@ -43,4 +43,23 @@ struct xen_hvm_pagetable_dying { typedef struct xen_hvm_pagetable_dying xen_hvm_pagetable_dying_t; DEFINE_GUEST_HANDLE_STRUCT(xen_hvm_pagetable_dying_t); +enum hvmmem_type_t { + HVMMEM_ram_rw, /* Normal read/write guest RAM */ + HVMMEM_ram_ro, /* Read-only; writes are discarded */ + HVMMEM_mmio_dm, /* Reads and write go to the device model */ +}; + +#define HVMOP_get_mem_type 15 +/* Return hvmmem_type_t for the specified pfn. */ +struct xen_hvm_get_mem_type { + /* Domain to be queried. */ + domid_t domid; + /* OUT variable. */ + uint16_t mem_type; + uint16_t pad[2]; /* align next field on 8-byte boundary */ + /* IN variable. */ + uint64_t pfn; +}; +DEFINE_GUEST_HANDLE_STRUCT(xen_hvm_get_mem_type); + #endif /* __XEN_PUBLIC_HVM_HVM_OP_H__ */ |