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The Xen hypercall interface is allowed to trash any or all of the argument registers, so we need to be careful that the kernel state isn't damaged. On 32-bit kernels, the hypercall parameter registers same as a regparm function call, so we've got away without explicit clobbering so far. The 64-bit ABI defines lots of caller-save registers, so save them all for safety. We can trim this set later by re-distributing the responsibility for saving all these registers. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>