[Xen-ia64-devel] [PATCH 4/12] make vmx_switch_rr7 map stack

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

# 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

Attachment: 16636_7a490dbc8f32_fix_vmx_switch_rr7_map_stack.patch
Description: Text Data

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