[Xen-devel] Problem with live migration

[Asim <linkasim@xxxxxxxxx>]

Hi,

While migrating Xen  - I get the following errors:-  I have PCI
enabled and would just like to get the migration working without any
device expectations.

(XEN) mm.c:1887:d0 Bad type (saw 28000001 != exp e0000000) for mfn 34126 (pfn 0)
(XEN) mm.c:665:d0 Error getting mfn 34126 (pfn 0) from L1 entry
0000000034126263 for dom2
(XEN) mm.c:955:d0 Failure in alloc_l1_table: entry 320
(XEN) mm.c:1908:d0 Error while validating mfn 3287b (pfn 1aab) for
type 20000000: caf=80000003 taf=20000001
(XEN) mm.c:702:d0 Attempt to create linear p.t. with write perms
(XEN) mm.c:1129:d0 Failure in alloc_l2_table: entry 260
(XEN) mm.c:1908:d0 Error while validating mfn d9d (pfn 756) for type
44000000: caf=80000002 taf=44000001
(XEN) mm.c:1203:d0 Failure in alloc_l3_table: entry 3
(XEN) mm.c:1908:d0 Error while validating mfn d9e (pfn 755) for type
60000000: caf=80000002 taf=60000001
(XEN) mm.c:2197:d0 Error while pinning mfn d9e
(XEN) mm.c:1887:d0 Bad type (saw 28000001 != exp e0000000) for mfn 34126 (pfn 0)
(XEN) mm.c:665:d0 Error getting mfn 34126 (pfn 0) from L1 entry
0000000034126263 for dom30
(XEN) mm.c:955:d0 Failure in alloc_l1_table: entry 320
(XEN) mm.c:1908:d0 Error while validating mfn 190e (pfn 1f0a5) for
type 20000000: caf=80000003 taf=20000001
(XEN) mm.c:702:d0 Attempt to create linear p.t. with write perms
(XEN) mm.c:1129:d0 Failure in alloc_l2_table: entry 260
(XEN) mm.c:1908:d0 Error while validating mfn d94 (pfn 758) for type
44000000: caf=80000002 taf=44000001
(XEN) mm.c:1203:d0 Failure in alloc_l3_table: entry 3


Upon investigating i found that 28000001 type is L2 page - pinned
memory. However, xen expects e0000000: writable page, not pinned
memory. Why is this a requirement? Is there any swiotlb function to
convert the former to the latter ?

Regards,
Asim

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