[Xen-devel] [PATCH v4 4/4] x86: remove defunct init/load/save_msr() hvm_funcs

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

These hvm_funcs are no longer required since no MSR values are saved or
restored by implementation-specific code.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: "Roger Pau Monné" <roger.pau@xxxxxxxxxx>

v2:
 - Re-instate err check on loop in hvm_load_cpu_msrs()
---
 xen/arch/x86/hvm/hvm.c        | 29 +++++++++--------------------
 xen/include/asm-x86/hvm/hvm.h |  4 ----
 2 files changed, 9 insertions(+), 24 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index deb7fb2adb..f84bf11f0f 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -1310,7 +1310,6 @@ static const uint32_t msrs_to_send[] = {
     MSR_AMD64_DR2_ADDRESS_MASK,
     MSR_AMD64_DR3_ADDRESS_MASK,
 };
-static unsigned int __read_mostly msr_count_max = ARRAY_SIZE(msrs_to_send);
 
 static int hvm_save_cpu_msrs(struct vcpu *v, hvm_domain_context_t *h)
 {
@@ -1320,7 +1319,7 @@ static int hvm_save_cpu_msrs(struct vcpu *v, 
hvm_domain_context_t *h)
     int err;
 
     err = _hvm_init_entry(h, CPU_MSR_CODE, v->vcpu_id,
-                             HVM_CPU_MSR_SIZE(msr_count_max));
+                             HVM_CPU_MSR_SIZE(ARRAY_SIZE(msrs_to_send)));
     if ( err )
         return err;
     ctxt = (struct hvm_msr *)&h->data[h->cur];
@@ -1353,10 +1352,7 @@ static int hvm_save_cpu_msrs(struct vcpu *v, 
hvm_domain_context_t *h)
         ctxt->msr[ctxt->count++].val = val;
     }
 
-    if ( hvm_funcs.save_msr )
-        hvm_funcs.save_msr(v, ctxt);
-
-    ASSERT(ctxt->count <= msr_count_max);
+    ASSERT(ctxt->count <= ARRAY_SIZE(msrs_to_send));
 
     for ( i = 0; i < ctxt->count; ++i )
         ctxt->msr[i]._rsvd = 0;
@@ -1431,9 +1427,6 @@ static int hvm_load_cpu_msrs(struct domain *d, 
hvm_domain_context_t *h)
             return -EOPNOTSUPP;
     /* Checking finished */
 
-    if ( hvm_funcs.load_msr )
-        err = hvm_funcs.load_msr(v, ctxt);
-
     for ( i = 0; !err && i < ctxt->count; ++i )
     {
         switch ( ctxt->msr[i].index )
@@ -1475,17 +1468,13 @@ static int __init 
hvm_register_CPU_save_and_restore(void)
                             sizeof(struct hvm_save_descriptor),
                         HVMSR_PER_VCPU);
 
-    if ( hvm_funcs.init_msr )
-        msr_count_max += hvm_funcs.init_msr();
-
-    if ( msr_count_max )
-        hvm_register_savevm(CPU_MSR_CODE,
-                            "CPU_MSR",
-                            hvm_save_cpu_msrs,
-                            hvm_load_cpu_msrs,
-                            HVM_CPU_MSR_SIZE(msr_count_max) +
-                                sizeof(struct hvm_save_descriptor),
-                            HVMSR_PER_VCPU);
+    hvm_register_savevm(CPU_MSR_CODE,
+                        "CPU_MSR",
+                        hvm_save_cpu_msrs,
+                        hvm_load_cpu_msrs,
+                        HVM_CPU_MSR_SIZE(ARRAY_SIZE(msrs_to_send)) +
+                            sizeof(struct hvm_save_descriptor),
+                        HVMSR_PER_VCPU);
 
     return 0;
 }
diff --git a/xen/include/asm-x86/hvm/hvm.h b/xen/include/asm-x86/hvm/hvm.h
index d41ed63232..a70fdbe298 100644
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -115,10 +115,6 @@ struct hvm_function_table {
     void (*save_cpu_ctxt)(struct vcpu *v, struct hvm_hw_cpu *ctxt);
     int (*load_cpu_ctxt)(struct vcpu *v, struct hvm_hw_cpu *ctxt);
 
-    unsigned int (*init_msr)(void);
-    void (*save_msr)(struct vcpu *, struct hvm_msr *);
-    int (*load_msr)(struct vcpu *, struct hvm_msr *);
-
     /* Examine specifics of the guest state. */
     unsigned int (*get_interrupt_shadow)(struct vcpu *v);
     void (*set_interrupt_shadow)(struct vcpu *v, unsigned int intr_shadow);
-- 
2.20.1


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