x86: make Viridian support optional

Add config option HVM_VIRIDIAN that covers viridian code within HVM.
Calls to viridian functions guarded by is_viridian_domain() and related macros.
Having this option may be beneficial by reducing code footprint for systems
that are not using Hyper-V.

Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Reviewed-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/hvm/Kconfig

@@ -63,6 +63,16 @@ config ALTP2M
 
 	  If unsure, stay with defaults.
 
+config HVM_VIRIDIAN
+	bool "Hyper-V enlightenments for guests" if EXPERT
+	default y
+	help
+	  Support optimizations for Hyper-V guests such as faster hypercalls,
+	  efficient timer and interrupt handling, and enhanced paravirtualized
+	  I/O. This is to improve performance and compatibility of Windows VMs.
+
+	  If unsure, say Y.
+
 config MEM_PAGING
 	bool "Xen memory paging support (UNSUPPORTED)" if UNSUPPORTED
 	depends on VM_EVENT

xen/arch/x86/hvm/Makefile

@@ -1,6 +1,6 @@
 obj-$(CONFIG_AMD_SVM) += svm/
 obj-$(CONFIG_INTEL_VMX) += vmx/
-obj-y += viridian/
+obj-$(CONFIG_HVM_VIRIDIAN) += viridian/
 
 obj-y += asid.o
 obj-y += dm.o

xen/arch/x86/hvm/hvm.c

@@ -695,9 +695,12 @@ int hvm_domain_initialise(struct domain *d,
     if ( hvm_tsc_scaling_supported )
         d->arch.hvm.tsc_scaling_ratio = hvm_default_tsc_scaling_ratio;
 
-    rc = viridian_domain_init(d);
-    if ( rc )
-        goto fail2;
+    if ( is_viridian_domain(d) )
+    {
+        rc = viridian_domain_init(d);
+        if ( rc )
+            goto fail2;
+    }
 
     rc = alternative_call(hvm_funcs.domain_initialise, d);
     if ( rc != 0 )
@@ -733,7 +736,8 @@ void hvm_domain_relinquish_resources(struct domain *d)
     if ( hvm_funcs.nhvm_domain_relinquish_resources )
         alternative_vcall(hvm_funcs.nhvm_domain_relinquish_resources, d);
 
-    viridian_domain_deinit(d);
+    if ( is_viridian_domain(d) )
+        viridian_domain_deinit(d);
 
     ioreq_server_destroy_all(d);
 
@@ -1637,9 +1641,12 @@ int hvm_vcpu_initialise(struct vcpu *v)
          && (rc = nestedhvm_vcpu_initialise(v)) < 0 ) /* teardown: nestedhvm_vcpu_destroy */
         goto fail5;
 
-    rc = viridian_vcpu_init(v);
-    if ( rc )
-        goto fail6;
+    if ( is_viridian_domain(d) )
+    {
+        rc = viridian_vcpu_init(v);
+        if ( rc )
+            goto fail6;
+    }
 
     rc = ioreq_server_add_vcpu_all(d, v);
     if ( rc != 0 )
@@ -1669,13 +1676,15 @@ int hvm_vcpu_initialise(struct vcpu *v)
  fail2:
     hvm_vcpu_cacheattr_destroy(v);
  fail1:
-    viridian_vcpu_deinit(v);
+    if ( is_viridian_domain(d) )
+        viridian_vcpu_deinit(v);
     return rc;
 }
 
 void hvm_vcpu_destroy(struct vcpu *v)
 {
-    viridian_vcpu_deinit(v);
+    if ( is_viridian_domain(v->domain) )
+        viridian_vcpu_deinit(v);
 
     ioreq_server_remove_vcpu_all(v->domain, v);
 

xen/arch/x86/hvm/vlapic.c

@@ -426,7 +426,8 @@ void vlapic_EOI_set(struct vlapic *vlapic)
      * priority vector and then recurse to handle the lower priority
      * vector.
      */
-    bool missed_eoi = viridian_apic_assist_completed(v);
+    bool missed_eoi = has_viridian_apic_assist(v->domain) &&
+                      viridian_apic_assist_completed(v);
     int vector;
 
  again:
@@ -442,7 +443,7 @@ void vlapic_EOI_set(struct vlapic *vlapic)
      * NOTE: It is harmless to call viridian_apic_assist_clear() on a
      *       recursion, even though it is not necessary.
      */
-    if ( !missed_eoi )
+    if ( has_viridian_apic_assist(v->domain) && !missed_eoi )
         viridian_apic_assist_clear(v);
 
     vlapic_clear_vector(vector, &vlapic->regs->data[APIC_ISR]);
@@ -1360,7 +1361,8 @@ int vlapic_has_pending_irq(struct vcpu *v)
      * If so, we need to emulate the EOI here before comparing ISR
      * with IRR.
      */
-    if ( viridian_apic_assist_completed(v) )
+    if ( has_viridian_apic_assist(v->domain) &&
+         viridian_apic_assist_completed(v) )
         vlapic_EOI_set(vlapic);
 
     isr = vlapic_find_highest_isr(vlapic);
@@ -1373,7 +1375,8 @@ int vlapic_has_pending_irq(struct vcpu *v)
     if ( isr >= 0 &&
          (irr & 0xf0) <= (isr & 0xf0) )
     {
-        viridian_apic_assist_clear(v);
+        if ( has_viridian_apic_assist(v->domain) )
+            viridian_apic_assist_clear(v);
         return -1;
     }
 

xen/arch/x86/include/asm/hvm/domain.h

@@ -111,7 +111,9 @@ struct hvm_domain {
     /* hypervisor intercepted msix table */
     struct list_head       msixtbl_list;
 
+#ifdef CONFIG_HVM_VIRIDIAN
     struct viridian_domain *viridian;
+#endif
 
     /*
      * TSC value that VCPUs use to calculate their tsc_offset value.

xen/arch/x86/include/asm/hvm/hvm.h

@@ -507,7 +507,8 @@ hvm_get_cpl(struct vcpu *v)
     (has_hvm_params(d) ? (d)->arch.hvm.params[HVM_PARAM_VIRIDIAN] : 0)
 
 #define is_viridian_domain(d) \
-    (is_hvm_domain(d) && (viridian_feature_mask(d) & HVMPV_base_freq))
+    (IS_ENABLED(CONFIG_HVM_VIRIDIAN) && \
+     is_hvm_domain(d) && (viridian_feature_mask(d) & HVMPV_base_freq))
 
 #define is_viridian_vcpu(v) \
     is_viridian_domain((v)->domain)

xen/arch/x86/include/asm/hvm/vcpu.h

@@ -172,7 +172,9 @@ struct hvm_vcpu {
     /* Pending hw/sw interrupt (.vector = -1 means nothing pending). */
     struct x86_event     inject_event;
 
+#ifdef CONFIG_HVM_VIRIDIAN
     struct viridian_vcpu *viridian;
+#endif
 };
 
 #endif /* __ASM_X86_HVM_VCPU_H__ */