[PATCH v2] kexec/x86: Do not map crash kernel area

[PATCH v2] kexec/x86: Do not map crash kernel area

[Daniel Kiper]

It looks that crash kernel area was mapped deliberately. However,
there is no any references to that mapping in new and even old kexec
code. Additionally, commit messages does not explain why this mapping
was made. kexec and kdump tests (new and old version) show that they are
working without this mapping. Hence, if it is not used and everything
works with out it then remove relevant code and do not crate crash
kernel area mapping anymore.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 xen/arch/x86/setup.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index f07ee2b..4833ca3 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1097,9 +1097,7 @@ void __init __start_xen(unsigned long mbi_p)
                          mod[i].mod_start,
                          PFN_UP(mod[i].mod_end), PAGE_HYPERVISOR);
     }
-    map_pages_to_xen((unsigned long)__va(kexec_crash_area.start),
-                     kexec_crash_area.start >> PAGE_SHIFT,
-                     PFN_UP(kexec_crash_area.size), PAGE_HYPERVISOR);
+
     xen_virt_end = ((unsigned long)_end + (1UL << L2_PAGETABLE_SHIFT) - 1) &
                    ~((1UL << L2_PAGETABLE_SHIFT) - 1);
     destroy_xen_mappings(xen_virt_end, XEN_VIRT_START + BOOTSTRAP_MAP_BASE);
-- 
1.7.10.4