[Xen-ia64-devel] [PATCH] Fix TLB purge and reload for xen heap in MCA handler

[SUZUKI Kazuhiro <kaz@xxxxxxxxxxxxxx>]

Hi all,

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

The following patch fixes it.

Thanks.
KAZ

Signed-off-by: Kazuhiro Suzuki <kaz@xxxxxxxxxxxxxx>

diff -r 124f7a7f5f84 xen/arch/ia64/linux-xen/mca_asm.S
--- a/xen/arch/ia64/linux-xen/mca_asm.S Tue Dec 11 10:22:37 2007 -0700
+++ b/xen/arch/ia64/linux-xen/mca_asm.S Wed Dec 12 14:31:21 2007 +0900
@@ -283,6 +283,19 @@ 4:
        ;;
        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)
        ;;

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