[Xen-changelog] [xen-unstable] [IA64] Support continuation for hypercall in hvm.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1200597128 25200
# Node ID 44aca51a4b7b9e8b19fd5bf83dd2aff7fb54dd37
# Parent  7238393ef22030463a88f35163a94031f7d5fd4c
[IA64] Support continuation for hypercall in hvm.

Signed-off-by: Tristan Gingold <tgingold@xxxxxxx>
---
 xen/arch/ia64/vmx/vmx_ivt.S |   44 ++++++++++++++++++++++++++------------------
 1 files changed, 26 insertions(+), 18 deletions(-)

diff -r 7238393ef220 -r 44aca51a4b7b xen/arch/ia64/vmx/vmx_ivt.S
--- a/xen/arch/ia64/vmx/vmx_ivt.S       Thu Jan 17 12:11:01 2008 -0700
+++ b/xen/arch/ia64/vmx/vmx_ivt.S       Thu Jan 17 12:12:08 2008 -0700
@@ -566,7 +566,6 @@ ENTRY(vmx_break_fault)
 
     mov.m r25=ar.unat                  // M2 (5 cyc)
     dep r29=r8,r29,41,2                        // I0   insert new ei into 
cr.ipsr
-//  adds r15=1024,r15                  // A    restore original syscall number
    //
    // If any of the above loads miss in L1D, we'll stall here until
    // the data arrives.
@@ -574,34 +573,43 @@ ENTRY(vmx_break_fault)
 ///////////////////////////////////////////////////////////////////////
 //    st1 [r16]=r0                             // M2|3 clear 
current->thread.on_ustack flag
     mov b6=r30                         // I0   setup syscall handler branch 
reg early
-//    cmp.ne pKStk,pUStk=r0,r0         // A    were we on kernel stacks 
already?
-
-//  and r9=_TIF_SYSCALL_TRACEAUDIT,r9  // A    mask trace or audit
+
     mov r18=ar.bsp                             // M2 (12 cyc)
    ;;
-//(pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1 // A    compute base of 
memory stack
     addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1 // A    compute base of 
memory stack
-//  cmp.eq p14,p0=r9,r0                        // A    are syscalls being 
traced/audited?
-//    br.call.sptk.many b7=ia64_syscall_setup  // B
     br.call.sptk.many b7=ia64_hypercall_setup  // B
 1:
     mov ar.rsc=0x3                             // M2   set eager mode, pl 0, 
LE, loadrs=0
-//    nop 0
-//    bsw.1                                    // B (6 cyc) regs are saved, 
switch to bank 1
     ;;
     ssm psr.ic | PSR_DEFAULT_BITS              // M2   now it's safe to 
re-enable intr.-collection
-//    movl r3=ia64_ret_from_syscall            // X
-    movl r3=ia64_leave_hypercall               // X
     ;;
 
     srlz.i                                     // M0   ensure interruption 
collection is on
-    mov rp=r3                          // I0   set the real return addr
-    //(p10) br.cond.spnt.many ia64_ret_from_syscall    // B    return if bad 
call-frame or r15 is a NaT
-    (p15)   ssm psr.i                          // M2   restore psr.i
-    //(p14) br.call.sptk.many b6=b6                    // B    invoke 
syscall-handker (ignore return addr)
-    br.call.sptk.many b6=b6                    // B    invoke syscall-handker 
(ignore return addr)
-//  br.cond.spnt.many ia64_trace_syscall       // B    do syscall-tracing 
thingamagic
-   ;;
+(p15)   ssm psr.i                              // M2   restore psr.i
+    br.call.sptk.many b0=b6                    // B    invoke syscall-handker 
(ignore return addr)
+       ;; 
+       //restore hypercall argument if continuation
+       adds r2=IA64_VCPU_HYPERCALL_CONTINUATION_OFS,r13
+       ;;
+       ld1 r20=[r2]
+       ;;
+       st1 [r2]=r0
+       cmp.ne p6,p0=r20,r0
+       ;;
+(p6)   adds r2=PT(R16)+16,r12
+(p6)   adds r3=PT(R17)+16,r12
+       ;;
+(p6)   ld8 r32=[r2],16
+(p6)   ld8 r33=[r3],16
+       ;;
+(p6)   ld8 r34=[r2],16
+(p6)   ld8 r35=[r3],16
+       ;;
+(p6)   ld8 r36=[r2],16
+       ;;
+       br.sptk.many ia64_leave_hypercall
+       ;;
+
    VMX_FAULT(11)
 END(vmx_break_fault)
 

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