[IA64] Fix TLB purge and reload for xen heap in MCA handler

Xen might panic when the TLB related MCA occurred because Xen
virtual address space moved to 0xf400000004000000.

The following patch fixes it.

Signed-off-by: Kazuhiro Suzuki <kaz@jp.fujitsu.com>

diff --git a/xen/arch/ia64/linux-xen/mca_asm.S b/xen/arch/ia64/linux-xen/mca_asm.S
index 641be79ceb8bbe52f72112e05bf6ef092a118bb5..fc770a09c33a8c36ef9b41f2774bfa01f3782515 100644 (file)
--- a/xen/arch/ia64/linux-xen/mca_asm.S
+++ b/xen/arch/ia64/linux-xen/mca_asm.S
@@ -283,6 +283,19 @@ ia64_do_tlb_purge:
        ;;
        srlz.d
        ;;
+#ifdef XEN
+       /* xen heap is identity mapped */
+       mov r19=ip
+       ;; 
+       dep r17=0,r19,0,KERNEL_TR_PAGE_SHIFT
+       ;; 
+       dep r17=-1,r17,60,4
+       ;; 
+       ptr.d r17,r18
+       ;;
+       srlz.d
+       ;; 
+#endif
        // 2. Purge DTR for PERCPU data.
        movl r16=PERCPU_ADDR
        mov r18=PERCPU_PAGE_SHIFT<<2
@@ -418,6 +431,18 @@ ia64_reload_tr:
        srlz.i
        srlz.d
        ;;
+#ifdef XEN
+       /* xen heap is identity mapped */
+       mov r16=IA64_TR_XEN_HEAP_REGS  
+       dep r17=-1,r17,60,4
+       ;; 
+       mov cr.ifa=r17
+       ;;
+       itr.d dtr[r16]=r18
+       ;;
+       srlz.d
+       ;; 
+#endif
        // 2. Reload DTR register for PERCPU data.
        GET_THIS_PADDR(r2, ia64_mca_per_cpu_pte)
        ;;