[Xen-ia64-devel] [rfc 15/16] Kexec: Purge the VHPT entry in the TLB on kexec

[Simon Horman <horms@xxxxxxxxxxxx>]

Should relocate_new_kernel(), which is run by the hypervisor, purge the
VHPT on XEN like ia64_do_purge_tlb() (code in the hypervisor) does?

There is a hypervisor portion of this patch which modifies
machine_kexec() to pass the appropriate extra argument to
ia64_do_purge_tlb().

Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>

Index: x/arch/ia64/kernel/relocate_kernel.S
===================================================================
--- x/arch/ia64/kernel/relocate_kernel.S        2007-07-05 18:52:40.000000000 
+0900
+++ x/arch/ia64/kernel/relocate_kernel.S        2007-07-05 19:00:16.000000000 
+0900
@@ -21,7 +21,7 @@
 GLOBAL_ENTRY(relocate_new_kernel)
        .prologue
 #ifdef CONFIG_XEN
-       alloc r31=ar.pfs,7,0,0,0
+       alloc r31=ar.pfs,8,0,0,0
 #else
        alloc r31=ar.pfs,4,0,0,0
 #endif
@@ -160,6 +160,20 @@ GLOBAL_ENTRY(relocate_new_kernel)
         srlz.i
        ;;
 
+#ifdef XEN
+       /* XXX: Is this neccessary ??? */
+       // purge TR entry for VHPT
+       mov r16=in7
+       ;;
+       dep r16=0,r16,0,IA64_GRANULE_SHIFT
+       mov r18=IA64_GRANULE_SHIFT<<2
+        ;;
+        ptr.d r16,r18
+        ;;
+        srlz.i
+       ;;
+#endif
+
        //copy segments
        movl r16=PAGE_MASK
         mov  r30=in0                    // in0 is page_list

-- 

-- 
Horms
  H: http://www.vergenet.net/~horms/
  W: http://www.valinux.co.jp/en/


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