[XEN PATCH v4 07/14] x86/traps: guard vmx specific functions with usinc_vmx() check

[Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>]

From: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>

Replace cpu_has_vmx check with using_vmx(), so that not only VMX support in CPU
is being checked at runtime, but also at build time we ensure the availability
of functions vmx_vmcs_enter() & vmx_vmcs_exit().

Also since CONFIG_VMX is checked in using_vmx and it depends on CONFIG_HVM,
we can drop #ifdef CONFIG_HVM lines around using_vmx.

Signed-off-by: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
changes in v4:
 - adjusted call to using_vmx(), as it has become an inline function
 - added tag
 - description changed a bit for more clarity
changes in v3:
 -using_vmx instead of IS_ENABLED(CONFIG_VMX)
 - updated description
---
 xen/arch/x86/traps.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index ee91fc56b1..d2af6d70d2 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -676,7 +676,6 @@ void vcpu_show_execution_state(struct vcpu *v)
 
     vcpu_pause(v); /* acceptably dangerous */
 
-#ifdef CONFIG_HVM
     /*
      * For VMX special care is needed: Reading some of the register state will
      * require VMCS accesses. Engaging foreign VMCSes involves acquiring of a
@@ -684,12 +683,11 @@ void vcpu_show_execution_state(struct vcpu *v)
      * region. Despite this being a layering violation, engage the VMCS right
      * here. This then also avoids doing so several times in close succession.
      */
-    if ( cpu_has_vmx && is_hvm_vcpu(v) )
+    if ( using_vmx() && is_hvm_vcpu(v) )
     {
         ASSERT(!in_irq());
         vmx_vmcs_enter(v);
     }
-#endif
 
     /* Prevent interleaving of output. */
     flags = console_lock_recursive_irqsave();
@@ -714,10 +712,8 @@ void vcpu_show_execution_state(struct vcpu *v)
         console_unlock_recursive_irqrestore(flags);
     }
 
-#ifdef CONFIG_HVM
-    if ( cpu_has_vmx && is_hvm_vcpu(v) )
+    if ( using_vmx() && is_hvm_vcpu(v) )
         vmx_vmcs_exit(v);
-#endif
 
     vcpu_unpause(v);
 }
-- 
2.25.1