On 04/15/2016 06:03 PM, Thomas Garnier wrote:
+void __init kernel_randomize_memory(void)
+{
+ size_t i;
+ unsigned long addr = memory_rand_start;
+ unsigned long padding, rand, mem_tb;
+ struct rnd_state rnd_st;
+ unsigned long remain_padding = memory_rand_end - memory_rand_start;
+
+ if (!kaslr_enabled())
+ return;
+
+ /* Take the additional space when Xen is not active. */
+ if (!xen_domain())
+ page_offset_base -= __XEN_SPACE;
This should be !xen_pv_domain(). Xen HVM guests are no different from
bare metal as far as address ranges are concerned. (Technically it's
probably !xen_pv_domain() && !xen_pvh_domain() but we can ignore PVH for
now since it is being replaced by an HVM-type guest)
Having said that, I am not sure I understand why page_offset_base is
shifted. I thought 0xffff800000000000 - 0xffff87ffffffffff is not
supposed to be used by anyone, whether we are running under a hypervisor
or not.
-boris
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