# HG changeset patch
# User yamahata@xxxxxxxxxxxxx
# Date 1197967036 -32400
# Node ID 7a490dbc8f32b32a19ba713f4f9a76e74d10fe1d
# Parent 425cd56ef7a955c593cc70c1ea5755c0b72e97b2
make vmx_swtich_rr7() consistent to ia64_new_rr7() so that it maps
stack.
PATCHNAME: fix_vmx_switch_rr7_map_stack
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
diff -r 425cd56ef7a9 -r 7a490dbc8f32 xen/arch/ia64/vmx/vmx_entry.S
--- a/xen/arch/ia64/vmx/vmx_entry.S Tue Dec 18 17:37:15 2007 +0900
+++ b/xen/arch/ia64/vmx/vmx_entry.S Tue Dec 18 17:37:16 2007 +0900
@@ -620,7 +620,6 @@ END(ia64_leave_hypercall)
#define PSR_BITS_TO_SET IA64_PSR_BN
//extern void vmx_switch_rr7(unsigned long rid, void *guest_vhpt, void *
pal_vaddr );
-
GLOBAL_ENTRY(vmx_switch_rr7)
// not sure this unwind statement is correct...
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(1)
@@ -672,6 +671,7 @@ 1:
mov cr.ifa=r17
mov r16=IA64_TR_KERNEL
movl r25 = PAGE_KERNEL
+ // r2=KERNEL_TR_PAGE_SHIFT truncated physicall address of ip
dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT
;;
or r24=r2,r25
@@ -693,6 +693,25 @@ 1:
itr.d dtr[r16]=r24
;;
+ // re-pin mapping for stack (current)
+ // unless overlaps with IA64_TR_XEN_HEAP_REGS
+ mov r26=IA64_GRANULE_SHIFT<<2
+ dep r21=0,r13,60,4 // physical address of "current"
+ ;;
+ dep r3=0,r21,0,KERNEL_TR_PAGE_SHIFT
+ ;;
+ cmp.eq p7,p0=r2,r3
+(p7) br.cond.sptk .stack_overlaps
+ ;;
+ ptr.d r13,r26
+ or r23=r21,r25 // construct PA | page properties
+ mov cr.itir=r26
+ mov cr.ifa=r13 // VA of next task...
+ mov r18=IA64_TR_CURRENT_STACK
+ ;;
+ itr.d dtr[r18]=r23 // wire in new mapping...
+.stack_overlaps:
+
// re-pin mappings for per-cpu data
movl r22 = PERCPU_ADDR
;;
@@ -709,8 +728,16 @@ 1:
;;
// re-pin mappings for guest_vhpt
+ // unless overlaps with IA64_TR_XEN_HEAP_REGS or IA64_TR_CURRENT_STACK
+ dep r18=0,loc5,0,KERNEL_TR_PAGE_SHIFT
+ dep r21=0,r21,0,IA64_GRANULE_SHIFT
+ dep r17=0,loc5,0,IA64_GRANULE_SHIFT
+ ;;
+ cmp.eq p6,p0=r18,r2 // check overlap with xen heap
+ cmp.eq p7,p0=r17,r21 // check overlap with current stack
+(p6) br.cond.sptk .vhpt_overlaps
+(p7) br.cond.sptk .vhpt_overlaps
mov r24=IA64_TR_VHPT
- movl r25=PAGE_KERNEL
;;
or loc5 = r25,loc5 // construct PA | page properties
mov r23 = IA64_GRANULE_SHIFT <<2
@@ -722,6 +749,7 @@ 1:
;;
itr.d dtr[r24]=loc5 // wire in new mapping...
;;
+.vhpt_overlaps:
// re-pin mappings for PAL code section
mov r24=IA64_TR_PALCODE
16636_7a490dbc8f32_fix_vmx_switch_rr7_map_stack.patch
Description: Text Data
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