KVM: x86/mmu: Drop unused CMPXCHG macro from paging_tmpl.h

Drop the CMPXCHG macro from paging_tmpl.h, it's no longer used now that
KVM uses a common uaccess helper to do 8-byte CMPXCHG.

Fixes: f122dfe4 ("KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220613225723.2734132-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/paging_tmpl.h

@@ -34,7 +34,6 @@
 	#define PT_HAVE_ACCESSED_DIRTY(mmu) true
 	#ifdef CONFIG_X86_64
 	#define PT_MAX_FULL_LEVELS PT64_ROOT_MAX_LEVEL
-	#define CMPXCHG "cmpxchgq"
 	#else
 	#define PT_MAX_FULL_LEVELS 2
 	#endif
@@ -51,7 +50,6 @@
 	#define PT_GUEST_DIRTY_SHIFT PT_DIRTY_SHIFT
 	#define PT_GUEST_ACCESSED_SHIFT PT_ACCESSED_SHIFT
 	#define PT_HAVE_ACCESSED_DIRTY(mmu) true
-	#define CMPXCHG "cmpxchgl"
 #elif PTTYPE == PTTYPE_EPT
 	#define pt_element_t u64
 	#define guest_walker guest_walkerEPT
@@ -64,9 +62,6 @@
 	#define PT_GUEST_DIRTY_SHIFT 9
 	#define PT_GUEST_ACCESSED_SHIFT 8
 	#define PT_HAVE_ACCESSED_DIRTY(mmu) (!(mmu)->cpu_role.base.ad_disabled)
-	#ifdef CONFIG_X86_64
-	#define CMPXCHG "cmpxchgq"
-	#endif
 	#define PT_MAX_FULL_LEVELS PT64_ROOT_MAX_LEVEL
 #else
 	#error Invalid PTTYPE value
@@ -1100,7 +1095,6 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
 #undef PT_MAX_FULL_LEVELS
 #undef gpte_to_gfn
 #undef gpte_to_gfn_lvl
-#undef CMPXCHG
 #undef PT_GUEST_ACCESSED_MASK
 #undef PT_GUEST_DIRTY_MASK
 #undef PT_GUEST_DIRTY_SHIFT