On 11/26/2014 01:41 PM, Andrew Cooper wrote:
On 26/11/14 12:15, Juergen Gross wrote:
Hi,
I tried to enable kdump on my test-machine with actual xen-unstable
booting via EFI.
The kdump kernel is not being loaded.
I'm seeing the memory being reserved:
(XEN) EFI RAM map:
(XEN) 0000000000000000 - 00000000000a0000 (usable)
(XEN) 0000000000100000 - 000000004bc00000 (usable)
(XEN) 000000004bc00000 - 000000005bc00000 (reserved)
(XEN) 000000005bc00000 - 000000005bfec000 (usable)
(XEN) 000000005bfec000 - 000000005c000000 (ACPI NVS)
(XEN) 000000005c000000 - 000000006a429000 (usable)
(XEN) 000000006a429000 - 000000006a42c000 (reserved)
(XEN) 000000006a42c000 - 000000006a7a2000 (usable)
(XEN) 000000006a7a2000 - 000000006a7a8000 (reserved)
(XEN) 000000006a7a8000 - 000000006a987000 (usable)
(XEN) 000000006a987000 - 000000006a98d000 (reserved)
(XEN) 000000006a98d000 - 000000006aa63000 (usable)
(XEN) 000000006aa63000 - 000000006aa73000 (reserved)
(XEN) 000000006aa73000 - 000000006ac60000 (usable)
(XEN) 000000006ac60000 - 000000006ac61000 (reserved)
(XEN) 000000006ac61000 - 000000006ac9b000 (ACPI data)
(XEN) 000000006ac9b000 - 000000006acac000 (reserved)
(XEN) 000000006acac000 - 000000006acad000 (usable)
(XEN) 000000006acad000 - 000000006acae000 (reserved)
(XEN) 000000006acae000 - 000000007189c000 (usable)
(XEN) 000000007189c000 - 0000000071946000 (reserved)
(XEN) 0000000071946000 - 0000000072d76000 (ACPI NVS)
(XEN) 0000000072d76000 - 0000000072db2000 (ACPI data)
(XEN) 0000000072db2000 - 0000000072edc000 (usable)
(XEN) 0000000080000000 - 0000000090000000 (reserved)
(XEN) 0000000100000000 - 0000002080000000 (usable)
(XEN) Kdump: 256MB (262144kB) at 0x206dff4000
I'd expect this area being visible in the efi or e820 map presented to
dom0, but I can't see anything:
This is expected. The dom0 kernel now has nothing at all do with
loading crash kernel. Loading happens via hypercalls straight from the
kexec utility.
You need kexec-tools 2.0.4 (I think) or later, compiled with Xen
support, but it should JustWork.
Should. I have kexec 2.0.5 with Xen support. Doesn't work:
Excerpt form strace:
"sysctl operation failed -- need to rebuild the user-space tool set?\n"
My personal translation: kexec is tightly coupled to the Xen version
(this one was built against Xen 4.4.1 AFAIK).
Perhaps we should add kexec to the tools directory?
Juergen
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