[PATCH v2 08/12] x86: mem-access is HVM-only

[Jan Beulich <jbeulich@xxxxxxxx>]

By excluding the file from being built for !HVM, #ifdef-ary can be
removed from it.

The new HVM dependency on the Kconfig option is benign for Arm.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: New.

--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -15,7 +15,6 @@ config X86
        select HAS_FAST_MULTIPLY
        select HAS_IOPORTS
        select HAS_KEXEC
-       select MEM_ACCESS_ALWAYS_ON
        select HAS_MEM_PAGING
        select HAS_NS16550
        select HAS_PASSTHROUGH
@@ -92,6 +91,7 @@ config PV_LINEAR_PT
 config HVM
        def_bool !PV_SHIM_EXCLUSIVE
        select IOREQ_SERVER
+       select MEM_ACCESS_ALWAYS_ON
        prompt "HVM support"
        ---help---
          Interfaces to support HVM domains.  HVM domains require hardware
--- a/xen/arch/x86/mm/mem_access.c
+++ b/xen/arch/x86/mm/mem_access.c
@@ -139,7 +139,6 @@ bool p2m_mem_access_emulate_check(struct
     return violation;
 }
 
-#ifdef CONFIG_HVM
 bool p2m_mem_access_check(paddr_t gpa, unsigned long gla,
                           struct npfec npfec,
                           vm_event_request_t **req_ptr)
@@ -282,7 +281,6 @@ int p2m_set_altp2m_mem_access(struct dom
      */
     return ap2m->set_entry(ap2m, gfn, mfn, PAGE_ORDER_4K, t, a, -1);
 }
-#endif
 
 static int set_mem_access(struct domain *d, struct p2m_domain *p2m,
                           struct p2m_domain *ap2m, p2m_access_t a,
@@ -290,7 +288,6 @@ static int set_mem_access(struct domain
 {
     int rc = 0;
 
-#ifdef CONFIG_HVM
     if ( ap2m )
     {
         rc = p2m_set_altp2m_mem_access(d, p2m, ap2m, a, gfn);
@@ -299,9 +296,6 @@ static int set_mem_access(struct domain
             rc = 0;
     }
     else
-#else
-    ASSERT(!ap2m);
-#endif
     {
         p2m_access_t _a;
         p2m_type_t t;
@@ -362,7 +356,6 @@ long p2m_set_mem_access(struct domain *d
     long rc = 0;
 
     /* altp2m view 0 is treated as the hostp2m */
-#ifdef CONFIG_HVM
     if ( altp2m_idx )
     {
         if ( altp2m_idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
@@ -372,9 +365,6 @@ long p2m_set_mem_access(struct domain *d
 
         ap2m = array_access_nospec(d->arch.altp2m_p2m, altp2m_idx);
     }
-#else
-    ASSERT(!altp2m_idx);
-#endif
 
     if ( !xenmem_access_to_p2m_access(p2m, access, &a) )
         return -EINVAL;
@@ -422,7 +412,6 @@ long p2m_set_mem_access_multi(struct dom
     long rc = 0;
 
     /* altp2m view 0 is treated as the hostp2m */
-#ifdef CONFIG_HVM
     if ( altp2m_idx )
     {
         if ( altp2m_idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
@@ -432,9 +421,6 @@ long p2m_set_mem_access_multi(struct dom
 
         ap2m = array_access_nospec(d->arch.altp2m_p2m, altp2m_idx);
     }
-#else
-    ASSERT(!altp2m_idx);
-#endif
 
     p2m_lock(p2m);
     if ( ap2m )
@@ -484,7 +470,6 @@ int p2m_get_mem_access(struct domain *d,
 {
     struct p2m_domain *p2m = p2m_get_hostp2m(d);
 
-#ifdef CONFIG_HVM
     if ( !altp2m_active(d) )
     {
         if ( altp2m_idx )
@@ -499,9 +484,6 @@ int p2m_get_mem_access(struct domain *d,
 
         p2m = array_access_nospec(d->arch.altp2m_p2m, altp2m_idx);
     }
-#else
-    ASSERT(!altp2m_idx);
-#endif
 
     return _p2m_get_mem_access(p2m, gfn, access);
 }
@@ -512,7 +494,6 @@ void arch_p2m_set_access_required(struct
 
     p2m_get_hostp2m(d)->access_required = access_required;
 
-#ifdef CONFIG_HVM
     if ( altp2m_active(d) )
     {
         unsigned int i;
@@ -524,7 +505,6 @@ void arch_p2m_set_access_required(struct
                 p2m->access_required = access_required;
         }
     }
-#endif
 }
 
 bool p2m_mem_access_sanity_check(const struct domain *d)
--- a/xen/arch/x86/vm_event.c
+++ b/xen/arch/x86/vm_event.c
@@ -265,6 +265,7 @@ void vm_event_emulate_check(struct vcpu
         return;
     }
 
+#ifdef CONFIG_HVM
     switch ( rsp->reason )
     {
     case VM_EVENT_REASON_MEM_ACCESS:
@@ -298,6 +299,7 @@ void vm_event_emulate_check(struct vcpu
     default:
         break;
     };
+#endif
 }
 
 void vm_event_reset_vmtrace(struct vcpu *v)
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -58,6 +58,7 @@ config MEM_ACCESS_ALWAYS_ON
 config MEM_ACCESS
        def_bool MEM_ACCESS_ALWAYS_ON
        prompt "Memory Access and VM events" if !MEM_ACCESS_ALWAYS_ON
+       depends on HVM
        ---help---
 
          Framework to configure memory access types for guests and receive