From d1b0028c88447488166712d9df4be96bc55d050b Mon Sep 17 00:00:00 2001
From: "fred@xuni-t01.sc.intel.com" <fred@xuni-t01.sc.intel.com>
Date: Tue, 2 Aug 2005 02:09:24 -0800
Subject: [PATCH] Add hypercall continuation support, or else dom_mem_op may
 fail.

Signed-off-by Kevin Tian <kevin.tian@intel.com>
---
 xen/arch/ia64/vmx_hypercall.c | 45 ++++++++++++++++++++++++++++++++++-
 xen/arch/ia64/xenmisc.c       |  2 ++
 xen/include/asm-ia64/domain.h |  1 +
 3 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/xen/arch/ia64/vmx_hypercall.c b/xen/arch/ia64/vmx_hypercall.c
index fc5f1f8c46..eb9816ad76 100644
--- a/xen/arch/ia64/vmx_hypercall.c
+++ b/xen/arch/ia64/vmx_hypercall.c
@@ -29,6 +29,7 @@
 #include <asm/regionreg.h>
 #include <asm/page.h>
 #include <xen/mm.h>
+#include <xen/multicall.h>
 
 
 void hyper_not_support(void)
@@ -51,6 +52,42 @@ void hyper_mmu_update(void)
     vmx_vcpu_increment_iip(vcpu);
 }
 
+unsigned long __hypercall_create_continuation(
+    unsigned int op, unsigned int nr_args, ...)
+{
+    struct mc_state *mcs = &mc_state[smp_processor_id()];
+    VCPU *vcpu = current;
+    struct cpu_user_regs *regs = vcpu_regs(vcpu);
+    unsigned int i;
+    va_list args;
+
+    va_start(args, nr_args);
+    if ( test_bit(_MCSF_in_multicall, &mcs->flags) ) {
+	panic("PREEMPT happen in multicall\n");	// Not support yet
+    } else {
+	vmx_vcpu_set_gr(vcpu, 15, op, 0);
+	for ( i = 0; i < nr_args; i++) {
+	    switch (i) {
+	    case 0: vmx_vcpu_set_gr(vcpu, 16, va_arg(args, unsigned long), 0);
+		    break;
+	    case 1: vmx_vcpu_set_gr(vcpu, 17, va_arg(args, unsigned long), 0);
+		    break;
+	    case 2: vmx_vcpu_set_gr(vcpu, 18, va_arg(args, unsigned long), 0);
+		    break;
+	    case 3: vmx_vcpu_set_gr(vcpu, 19, va_arg(args, unsigned long), 0);
+		    break;
+	    case 4: vmx_vcpu_set_gr(vcpu, 20, va_arg(args, unsigned long), 0);
+		    break;
+	    default: panic("Too many args for hypercall continuation\n");
+		    break;
+	    }
+	}
+    }
+    vcpu->arch.hypercall_continuation = 1;
+    va_end(args);
+    return op;
+}
+
 void hyper_dom_mem_op(void)
 {
     VCPU *vcpu=current;
@@ -65,7 +102,13 @@ void hyper_dom_mem_op(void)
     printf("do_dom_mem return value: %lx\n", ret);
     vmx_vcpu_set_gr(vcpu, 8, ret, 0);
 
-    vmx_vcpu_increment_iip(vcpu);
+    /* Hard to define a special return value to indicate hypercall restart.
+     * So just add a new mark, which is SMP safe
+     */
+    if (vcpu->arch.hypercall_continuation == 1)
+	vcpu->arch.hypercall_continuation = 0;
+    else
+	vmx_vcpu_increment_iip(vcpu);
 }
 
 
diff --git a/xen/arch/ia64/xenmisc.c b/xen/arch/ia64/xenmisc.c
index b59cb03480..1f2b9c423d 100644
--- a/xen/arch/ia64/xenmisc.c
+++ b/xen/arch/ia64/xenmisc.c
@@ -103,11 +103,13 @@ while(1);
 }
 #endif
 
+#ifndef CONFIG_VTI
 unsigned long __hypercall_create_continuation(
 	unsigned int op, unsigned int nr_args, ...)
 {
 	printf("__hypercall_create_continuation: not implemented!!!\n");
 }
+#endif
 
 ///////////////////////////////
 
diff --git a/xen/include/asm-ia64/domain.h b/xen/include/asm-ia64/domain.h
index 0b270a7372..7eb2a3f18c 100644
--- a/xen/include/asm-ia64/domain.h
+++ b/xen/include/asm-ia64/domain.h
@@ -88,6 +88,7 @@ struct arch_vcpu {
     thash_cb_t *vtlb;
     char irq_new_pending;
     char irq_new_condition;    // vpsr.i/vtpr change, check for pending VHPI
+    char hypercall_continuation;
     //for phycial  emulation
     unsigned long old_rsc;
     int mode_flags;
-- 
2.30.2