1 files changed, 33 insertions, 6 deletions

diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index 8864230d55af..9fe478d98406 100644
--- a/arch/x86/kernel/machine_kexec_32.c
+++ b/arch/x86/kernel/machine_kexec_32.c
@@ -22,6 +22,7 @@
 #include <asm/cpufeature.h>
 #include <asm/desc.h>
 #include <asm/system.h>
+#include <asm/cacheflush.h>
 
 #define PAGE_ALIGNED __attribute__ ((__aligned__(PAGE_SIZE)))
 static u32 kexec_pgd[1024] PAGE_ALIGNED;
@@ -85,10 +86,12 @@ static void load_segments(void)
  * reboot code buffer to allow us to avoid allocations
  * later.
  *
- * Currently nothing.
+ * Make control page executable.
  */
 int machine_kexec_prepare(struct kimage *image)
 {
+        if (nx_enabled)
+                set_pages_x(image->control_code_page, 1);
         return 0;
 }
 
@@ -98,27 +101,48 @@ int machine_kexec_prepare(struct kimage *image)
  */
 void machine_kexec_cleanup(struct kimage *image)
 {
+        if (nx_enabled)
+                set_pages_nx(image->control_code_page, 1);
 }
 
 /*
  * Do not allocate memory (or fail in any way) in machine_kexec().
  * We are past the point of no return, committed to rebooting now.
  */
-NORET_TYPE void machine_kexec(struct kimage *image)
+void machine_kexec(struct kimage *image)
 {
         unsigned long page_list[PAGES_NR];
         void *control_page;
+        asmlinkage unsigned long
+                (*relocate_kernel_ptr)(unsigned long indirection_page,
+                                       unsigned long control_page,
+                                       unsigned long start_address,
+                                       unsigned int has_pae,
+                                       unsigned int preserve_context);
 
         tracer_disable();
 
         /* Interrupts aren't acceptable while we reboot */
         local_irq_disable();
 
+        if (image->preserve_context) {
+#ifdef CONFIG_X86_IO_APIC
+                /* We need to put APICs in legacy mode so that we can
+                 * get timer interrupts in second kernel. kexec/kdump
+                 * paths already have calls to disable_IO_APIC() in
+                 * one form or other. kexec jump path also need
+                 * one.
+                 */
+                disable_IO_APIC();
+#endif
+        }
+
         control_page = page_address(image->control_code_page);
-        memcpy(control_page, relocate_kernel, PAGE_SIZE);
+        memcpy(control_page, relocate_kernel, PAGE_SIZE/2);
 
+        relocate_kernel_ptr = control_page;
         page_list[PA_CONTROL_PAGE] = __pa(control_page);
-        page_list[VA_CONTROL_PAGE] = (unsigned long)relocate_kernel;
+        page_list[VA_CONTROL_PAGE] = (unsigned long)control_page;
         page_list[PA_PGD] = __pa(kexec_pgd);
         page_list[VA_PGD] = (unsigned long)kexec_pgd;
 #ifdef CONFIG_X86_PAE
@@ -131,6 +155,7 @@ NORET_TYPE void machine_kexec(struct kimage *image)
         page_list[VA_PTE_0] = (unsigned long)kexec_pte0;
         page_list[PA_PTE_1] = __pa(kexec_pte1);
         page_list[VA_PTE_1] = (unsigned long)kexec_pte1;
+        page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page) << PAGE_SHIFT);
 
         /* The segment registers are funny things, they have both a
          * visible and an invisible part.  Whenever the visible part is
@@ -149,8 +174,10 @@ NORET_TYPE void machine_kexec(struct kimage *image)
         set_idt(phys_to_virt(0),0);
 
         /* now call it */
-        relocate_kernel((unsigned long)image->head, (unsigned long)page_list,
-                        image->start, cpu_has_pae);
+        image->start = relocate_kernel_ptr((unsigned long)image->head,
+                                           (unsigned long)page_list,
+                                           image->start, cpu_has_pae,
+                                           image->preserve_context);
 }
 
 void arch_crash_save_vmcoreinfo(void)