[Xen-devel] [PATCH v7 12/15] x86/hvm: Remove loop from hvm_save_cpu_msrs func

[Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>]

Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 58 +++++++++++++++++++-------------------------------
 1 file changed, 22 insertions(+), 36 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 2542cbd..a88efeb 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1322,10 +1322,18 @@ static const uint32_t msrs_to_send[] = {
 };
 static unsigned int __read_mostly msr_count_max = ARRAY_SIZE(msrs_to_send);
 
-static int hvm_save_cpu_msrs_one(struct vcpu *v, struct hvm_msr *ctxt)
+static int hvm_save_cpu_msrs(struct domain *d, hvm_domain_context_t *h)
 {
+    struct vcpu *v = NULL;
+    struct hvm_save_descriptor *desc = _p(&h->data[h->cur]);
+    struct hvm_msr *ctxt;
     unsigned int i;
 
+    if ( _hvm_init_entry(h, CPU_MSR_CODE, v->vcpu_id,
+                         HVM_CPU_MSR_SIZE(msr_count_max)) )
+        return 1;
+    ctxt = (struct hvm_msr *)&h->data[h->cur];
+    ctxt->count = 0;
     for ( i = 0; i < ARRAY_SIZE(msrs_to_send); ++i )
     {
         uint64_t val;
@@ -1351,46 +1359,24 @@ static int hvm_save_cpu_msrs_one(struct vcpu *v, struct 
hvm_msr *ctxt)
         ctxt->msr[ctxt->count].index = msrs_to_send[i];
         ctxt->msr[ctxt->count++].val = val;
     }
-    return 0;
-}
 
-static int hvm_save_cpu_msrs(struct domain *d, hvm_domain_context_t *h)
-{
-    struct vcpu *v;
+    if ( hvm_funcs.save_msr )
+        hvm_funcs.save_msr(v, ctxt);
 
-    for_each_vcpu ( d, v )
-    {
-        struct hvm_save_descriptor *desc = _p(&h->data[h->cur]);
-        struct hvm_msr *ctxt;
-        unsigned int i;
+    ASSERT(ctxt->count <= msr_count_max);
 
-        if ( _hvm_init_entry(h, CPU_MSR_CODE, v->vcpu_id,
-                             HVM_CPU_MSR_SIZE(msr_count_max)) )
-            return 1;
-        ctxt = (struct hvm_msr *)&h->data[h->cur];
-        ctxt->count = 0;
-
-        if ( hvm_save_cpu_msrs_one(v, ctxt) == -ENXIO )
-            return -ENXIO;
-
-        if ( hvm_funcs.save_msr )
-            hvm_funcs.save_msr(v, ctxt);
-
-        ASSERT(ctxt->count <= msr_count_max);
-
-        for ( i = 0; i < ctxt->count; ++i )
-            ctxt->msr[i]._rsvd = 0;
+    for ( i = 0; i < ctxt->count; ++i )
+        ctxt->msr[i]._rsvd = 0;
 
-        if ( ctxt->count )
-        {
-            /* Rewrite length to indicate how much space we actually used. */
-            desc->length = HVM_CPU_MSR_SIZE(ctxt->count);
-            h->cur += HVM_CPU_MSR_SIZE(ctxt->count);
-        }
-        else
-            /* or rewind and remove the descriptor from the stream. */
-            h->cur -= sizeof(struct hvm_save_descriptor);
+    if ( ctxt->count )
+    {
+        /* Rewrite length to indicate how much space we actually used. */
+        desc->length = HVM_CPU_MSR_SIZE(ctxt->count);
+        h->cur += HVM_CPU_MSR_SIZE(ctxt->count);
     }
+    else
+        /* or rewind and remove the descriptor from the stream. */
+        h->cur -= sizeof(struct hvm_save_descriptor);
 
     return 0;
 }
-- 
2.7.4


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