[Xen-devel] [PATCH v13 04/11] x86/hvm: Introduce hvm_save_cpu_xsave_states_one

[Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>]

This is used to save data from a single instance.

Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>

---
Changes since V11:
        - hvm_save_cpu_xsave_states_one() returns the err from
          _hvm_init_entry().
        - hvm_save_cpu_xsave_states() returns err from
          hvm_save_cpu_xsave_states_one();
---
 xen/arch/x86/hvm/hvm.c | 42 +++++++++++++++++++++++++++---------------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 9027deb..545812e 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1188,33 +1188,45 @@ HVM_REGISTER_SAVE_RESTORE(CPU, hvm_save_cpu_ctxt, 
hvm_load_cpu_ctxt,
                                            save_area) + \
                                   xstate_ctxt_size(xcr0))
 
-static int hvm_save_cpu_xsave_states(struct domain *d, hvm_domain_context_t *h)
+static int hvm_save_cpu_xsave_states_one(struct vcpu *v, hvm_domain_context_t 
*h)
 {
-    struct vcpu *v;
     struct hvm_hw_cpu_xsave *ctxt;
+    unsigned int size = HVM_CPU_XSAVE_SIZE(v->arch.xcr0_accum);
+    int err = 0;
 
     if ( !cpu_has_xsave )
         return 0;   /* do nothing */
 
+    err = _hvm_init_entry(h, CPU_XSAVE_CODE, v->vcpu_id, size);
+    if ( err )
+        return err;
+
+    ctxt = (struct hvm_hw_cpu_xsave *)&h->data[h->cur];
+    h->cur += size;
+    ctxt->xfeature_mask = xfeature_mask;
+    ctxt->xcr0 = v->arch.xcr0;
+    ctxt->xcr0_accum = v->arch.xcr0_accum;
+
+    expand_xsave_states(v, &ctxt->save_area,
+                        size - offsetof(typeof(*ctxt), save_area));
+    return 0;
+}
+
+static int hvm_save_cpu_xsave_states(struct domain *d, hvm_domain_context_t *h)
+{
+    struct vcpu *v;
+    int err = 0;
+
     for_each_vcpu ( d, v )
     {
-        unsigned int size = HVM_CPU_XSAVE_SIZE(v->arch.xcr0_accum);
-
         if ( !xsave_enabled(v) )
             continue;
-        if ( _hvm_init_entry(h, CPU_XSAVE_CODE, v->vcpu_id, size) )
-            return 1;
-        ctxt = (struct hvm_hw_cpu_xsave *)&h->data[h->cur];
-        h->cur += size;
-
-        ctxt->xfeature_mask = xfeature_mask;
-        ctxt->xcr0 = v->arch.xcr0;
-        ctxt->xcr0_accum = v->arch.xcr0_accum;
-        expand_xsave_states(v, &ctxt->save_area,
-                            size - offsetof(typeof(*ctxt), save_area));
+        err = hvm_save_cpu_xsave_states_one(v, h);
+        if ( err )
+            break;
     }
 
-    return 0;
+    return err;
 }
 
 /*
-- 
2.7.4


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