---

yaml
---
r: 163289
b: refs/heads/master
c: 07a6a4a
h: refs/heads/master
i:
  163287: 2cf79bf
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4295ab34883d2070b1145e14f4619478e9788807
+refs/heads/master: 07a6a4ae827b54cec4c1b1d92bed1cc9176b45ec

trunk/arch/ia64/include/asm/mca.h

@@ -145,6 +145,7 @@ extern void ia64_mca_ucmc_handler(struct pt_regs *, struct ia64_sal_os_state *);
 extern void ia64_init_handler(struct pt_regs *,
 			      struct switch_stack *,
 			      struct ia64_sal_os_state *);
+extern void ia64_os_init_on_kdump(void);
 extern void ia64_monarch_init_handler(void);
 extern void ia64_slave_init_handler(void);
 extern void ia64_mca_cmc_vector_setup(void);

trunk/arch/ia64/kernel/machine_kexec.c

@@ -24,6 +24,8 @@
 #include <asm/delay.h>
 #include <asm/meminit.h>
 #include <asm/processor.h>
+#include <asm/sal.h>
+#include <asm/mca.h>
 
 typedef NORET_TYPE void (*relocate_new_kernel_t)(
 					unsigned long indirection_page,
@@ -85,11 +87,21 @@ static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
 	void *pal_addr = efi_get_pal_addr();
 	unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
 	int ii;
+	u64 fp, gp;
+	ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;
 
 	BUG_ON(!image);
 	if (image->type == KEXEC_TYPE_CRASH) {
 		crash_save_this_cpu();
 		current->thread.ksp = (__u64)info->sw - 16;
+
+		/* Register noop init handler */
+		fp = ia64_tpa(init_handler->fp);
+		gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
+		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
+	} else {
+		/* Unregister init handlers of current kernel */
+		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
 	}
 
 	/* Interrupts aren't acceptable while we reboot */

trunk/arch/ia64/kernel/mca_asm.S

@@ -40,6 +40,7 @@
 
 	.global ia64_do_tlb_purge
 	.global ia64_os_mca_dispatch
+	.global ia64_os_init_on_kdump
 	.global ia64_os_init_dispatch_monarch
 	.global ia64_os_init_dispatch_slave
 
@@ -298,6 +299,25 @@ END(ia64_os_mca_virtual_begin)
 
 //StartMain////////////////////////////////////////////////////////////////////
 
+//
+// NOP init handler for kdump.  In panic situation, we may receive INIT
+// while kernel transition.  Since we initialize registers on leave from
+// current kernel, no longer monarch/slave handlers of current kernel in
+// virtual mode are called safely.
+// We can unregister these init handlers from SAL, however then the INIT
+// will result in warmboot by SAL and we cannot retrieve the crashdump.
+// Therefore register this NOP function to SAL, to prevent entering virtual
+// mode and resulting warmboot by SAL.
+//
+ia64_os_init_on_kdump:
+	mov		r8=r0		// IA64_INIT_RESUME
+	mov             r9=r10		// SAL_GP
+	mov		r22=r17		// *minstate
+	;;
+	mov		r10=r0		// return to same context
+	mov		b0=r12		// SAL_CHECK return address
+	br		b0
+
 //
 // SAL to OS entry point for INIT on all processors.  This has been defined for
 // registration purposes with SAL as a part of ia64_mca_init.  Monarch and