KVM: arm64: Use kvzalloc() for kvm struct allocation

Physically-allocated KVM structs aren't necessary when in VHE mode as
there's no need to share with the hyp's address space. Of course, there
can still be a performance benefit from physical allocations.

Use kvzalloc() for opportunistic physical allocations.

Acked-by: Vishal Moola (Oracle) <[e-mail]>
Reviewed-by: Marc Zyngier <[e-mail]>
Reviewed-by: Joey Gouly <[e-mail]>
Link: https://msgid.link/[e-mail]
Signed-off-by: Oliver Upton <[e-mail]>

arch/arm64/kvm/arm.c

···
 	if (!has_vhe())
 		return kzalloc(sz, GFP_KERNEL_ACCOUNT);
 
-	return __vmalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
+	return kvzalloc(sz, GFP_KERNEL_ACCOUNT);
 }
 
 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)