KVM: arm64: Add endian casting to kvm_swap_s[12]_desc()

Keep sparse quiet by explicitly casting endianness conversion
when swapping S1 and S2 descriptors.

Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Fixes: c59ca4b5b0c3f ("KVM: arm64: Implement HW access flag management in stage-1 SW PTW")
Fixes: 39db933ba67f8 ("KVM: arm64: nv: Implement HW access flag management in stage-2 SW PTW")
Signed-off-by: Marc Zyngier <[e-mail]>
Link: https://msgid.link/[e-mail]
Signed-off-by: Oliver Upton <[e-mail]>

arch/arm64/kvm/at.c

···
 			    struct s1_walk_info *wi)
 {
 	if (wi->be) {
-		old = cpu_to_be64(old);
-		new = cpu_to_be64(new);
+		old = (__force u64)cpu_to_be64(old);
+		new = (__force u64)cpu_to_be64(new);
 	} else {
-		old = cpu_to_le64(old);
-		new = cpu_to_le64(new);
+		old = (__force u64)cpu_to_le64(old);
+		new = (__force u64)cpu_to_le64(new);
 	}
 
 	return __kvm_at_swap_desc(vcpu->kvm, pa, old, new);

arch/arm64/kvm/nested.c

···
 			      struct s2_walk_info *wi)
 {
 	if (wi->be) {
-		old = cpu_to_be64(old);
-		new = cpu_to_be64(new);
+		old = (__force u64)cpu_to_be64(old);
+		new = (__force u64)cpu_to_be64(new);
 	} else {
-		old = cpu_to_le64(old);
-		new = cpu_to_le64(new);
+		old = (__force u64)cpu_to_le64(old);
+		new = (__force u64)cpu_to_le64(new);
 	}
 
 	return __kvm_at_swap_desc(vcpu->kvm, pa, old, new);