KVM: x86/mmu: Rename "nxe" role bit to "efer_nx" for macro shenanigans

Rename "nxe" to "efer_nx" so that future macro magic can use the pattern
<reg>_<bit> for all CR0, CR4, and EFER bits that included in the role.
Using "efer_nx" also makes it clear that the role bit reflects EFER.NX,
not the NX bit in the corresponding PTE.
Signed-off-by: NSean Christopherson <seanjc@google.com>
Message-Id: <20210622175739.3610207-25-seanjc@google.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Documentation/virt/kvm/mmu.rst

@@ -180,8 +180,8 @@ Shadow pages contain the following information:
   role.gpte_is_8_bytes:
     Reflects the size of the guest PTE for which the page is valid, i.e. '1'
     if 64-bit gptes are in use, '0' if 32-bit gptes are in use.
-  role.nxe:
-    Contains the value of efer.nxe for which the page is valid.
+  role.efer_nx:
+    Contains the value of efer.nx for which the page is valid.
   role.cr0_wp:
     Contains the value of cr0.wp for which the page is valid.
   role.smep_andnot_wp:

arch/x86/include/asm/kvm_host.h

@@ -274,7 +274,7 @@ struct kvm_kernel_irq_routing_entry;
  * by indirect shadow page can not be more than 15 bits.
  *
  * Currently, we used 14 bits that are @level, @gpte_is_8_bytes, @quadrant, @access,
- * @nxe, @cr0_wp, @smep_andnot_wp and @smap_andnot_wp.
+ * @efer_nx, @cr0_wp, @smep_andnot_wp and @smap_andnot_wp.
  */
 union kvm_mmu_page_role {
 	u32 word;
@@ -285,7 +285,7 @@ union kvm_mmu_page_role {
 		unsigned direct:1;
 		unsigned access:3;
 		unsigned invalid:1;
-		unsigned nxe:1;
+		unsigned efer_nx:1;
 		unsigned cr0_wp:1;
 		unsigned smep_andnot_wp:1;
 		unsigned smap_andnot_wp:1;

arch/x86/kvm/mmu/mmu.c

@@ -4567,7 +4567,7 @@ static union kvm_mmu_role kvm_calc_mmu_role_common(struct kvm_vcpu *vcpu,
 	union kvm_mmu_role role = {0};
 
 	role.base.access = ACC_ALL;
-	role.base.nxe = ____is_efer_nx(regs);
+	role.base.efer_nx = ____is_efer_nx(regs);
 	role.base.cr0_wp = ____is_cr0_wp(regs);
 	role.base.smm = is_smm(vcpu);
 	role.base.guest_mode = is_guest_mode(vcpu);

arch/x86/kvm/mmu/mmutrace.h

@@ -40,7 +40,7 @@
 			 role.direct ? " direct" : "",			\
 			 access_str[role.access],			\
 			 role.invalid ? " invalid" : "",		\
-			 role.nxe ? "" : "!",				\
+			 role.efer_nx ? "" : "!",			\
 			 role.ad_disabled ? "!" : "",			\
 			 __entry->root_count,				\
 			 __entry->unsync ? "unsync" : "sync", 0);	\

tools/lib/traceevent/plugins/plugin_kvm.c

@@ -366,7 +366,7 @@ union kvm_mmu_page_role {
 		unsigned direct:1;
 		unsigned access:3;
 		unsigned invalid:1;
-		unsigned nxe:1;
+		unsigned efer_nx:1;
 		unsigned cr0_wp:1;
 		unsigned smep_and_not_wp:1;
 		unsigned smap_and_not_wp:1;
@@ -403,7 +403,7 @@ static int kvm_mmu_print_role(struct trace_seq *s, struct tep_record *record,
 				 access_str[role.access],
 				 role.invalid ? " invalid" : "",
 				 role.cr4_pae ? "" : "!",
-				 role.nxe ? "" : "!",
+				 role.efer_nx ? "" : "!",
 				 role.cr0_wp ? "" : "!",
 				 role.smep_and_not_wp ? " smep" : "",
 				 role.smap_and_not_wp ? " smap" : "",