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Thanks: Haigang Li --- v2v/virt-v2v.pod | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/v2v/virt-v2v.pod b/v2v/virt-v2v.pod index 251b4919f..09f505f91 100644 --- a/v2v/virt-v2v.pod +++ b/v2v/virt-v2v.pod @@ -977,6 +977,25 @@ A recommended procedure is, before using virt-v2v, to check that the boot kernel is the best kernel available in the guest (for example by making sure the guest is up-to-date). +=head2 "vsyscall attempted with vsysca...

Debian kernels have disabled legacy vsyscall page support meaning they cannot runs binaries that predate c.2013. To enable it again you must add vsyscall=emulate to the kernel command line when booting. It's unclear why Debian disabled this as according to the documentation: Disabling this option saves about 7K of kernel size and possibly 4K of additional runtime pagetable memory.