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dump: update phys_base header field based on VMCOREINFO content

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If the guest note is VMCOREINFO, try to get phys_base from it.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-09-11 18:59:26 +02:00 • committed by Michael S. Tsirkin
parent 903ef73496
commit d9feb51772
2 changed files with 62 additions and 2 deletions
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8
docs/specs/vmcoreinfo.txt
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@ -39,3 +39,11 @@ qemu dumps.
The note format/class must be of the target bitness and the size must
be less than 1Mb.
If the ELF note name is "VMCOREINFO", it is expected to be the Linux
vmcoreinfo note (see Documentation/ABI/testing/sysfs-kernel-vmcoreinfo
in Linux source). In this case, qemu dump code will read the content
as a key=value text file, looking for "NUMBER(phys_base)" key
value. The value is expected to be more accurate than architecture
guess of the value. This is useful for KASLR-enabled guest with
ancient tools not handling the VMCOREINFO note.