Re: [Xen-devel] [PATCH] x86/pv: Fill all Xen slots in init_guest_l4_table()

2017-08-29 Thread Jan Beulich
>>> On 29.08.17 at 12:24, wrote: > There is a bug when using highmem-start= where some L4 directmap slots are not > audited in alloc_l4_table(), and not overwritten by init_guest_l4_table(). > > As highmem_start is only available in debug builds of the hypervisor, this > does not constitute a sec

[Xen-devel] [PATCH] x86/pv: Fill all Xen slots in init_guest_l4_table()

2017-08-29 Thread Andrew Cooper
There is a bug when using highmem-start= where some L4 directmap slots are not audited in alloc_l4_table(), and not overwritten by init_guest_l4_table(). As highmem_start is only available in debug builds of the hypervisor, this does not constitute a security issue. Ensure that init_guest_l4_tabl