KVM: PPC: Book3S HV: Use accessors for VCPU registers

Introduce accessor generator macros for Book3S HV VCPU registers. Use
the accessor functions to replace direct accesses to this registers.

This will be important later for Nested APIv2 support which requires
additional functionality for accessing and modifying VCPU state.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230914030600.16993-7-jniethe5@gmail.com

arch/powerpc/kvm/book3s_64_mmu_radix.c

@@ -15,6 +15,7 @@
 
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
+#include "book3s_hv.h"
 #include <asm/page.h>
 #include <asm/mmu.h>
 #include <asm/pgalloc.h>
@@ -294,9 +295,9 @@ int kvmppc_mmu_radix_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 	} else {
 		if (!(pte & _PAGE_PRIVILEGED)) {
 			/* Check AMR/IAMR to see if strict mode is in force */
-			if (vcpu->arch.amr & (1ul << 62))
+			if (kvmppc_get_amr_hv(vcpu) & (1ul << 62))
 				gpte->may_read = 0;
-			if (vcpu->arch.amr & (1ul << 63))
+			if (kvmppc_get_amr_hv(vcpu) & (1ul << 63))
 				gpte->may_write = 0;
 			if (vcpu->arch.iamr & (1ul << 62))
 				gpte->may_execute = 0;