static int recreate_hyp_mappings()

in kvm/hyp/nvhe/setup.c [57:134]

• 55 lines of code
• 14 McCabe index (conditional complexity)

static int recreate_hyp_mappings(phys_addr_t phys, unsigned long size,
				 unsigned long *per_cpu_base,
				 u32 hyp_va_bits)
{
	void *start, *end, *virt = hyp_phys_to_virt(phys);
	unsigned long pgt_size = hyp_s1_pgtable_pages() << PAGE_SHIFT;
	enum kvm_pgtable_prot prot;
	int ret, i;

	/* Recreate the hyp page-table using the early page allocator */
	hyp_early_alloc_init(hyp_pgt_base, pgt_size);
	ret = kvm_pgtable_hyp_init(&pkvm_pgtable, hyp_va_bits,
				   &hyp_early_alloc_mm_ops);
	if (ret)
		return ret;

	ret = hyp_create_idmap(hyp_va_bits);
	if (ret)
		return ret;

	ret = hyp_map_vectors();
	if (ret)
		return ret;

	ret = hyp_back_vmemmap(phys, size, hyp_virt_to_phys(vmemmap_base));
	if (ret)
		return ret;

	ret = pkvm_create_mappings(__hyp_text_start, __hyp_text_end, PAGE_HYP_EXEC);
	if (ret)
		return ret;

	ret = pkvm_create_mappings(__hyp_rodata_start, __hyp_rodata_end, PAGE_HYP_RO);
	if (ret)
		return ret;

	ret = pkvm_create_mappings(__hyp_bss_start, __hyp_bss_end, PAGE_HYP);
	if (ret)
		return ret;

	ret = pkvm_create_mappings(virt, virt + size, PAGE_HYP);
	if (ret)
		return ret;

	for (i = 0; i < hyp_nr_cpus; i++) {
		start = (void *)kern_hyp_va(per_cpu_base[i]);
		end = start + PAGE_ALIGN(hyp_percpu_size);
		ret = pkvm_create_mappings(start, end, PAGE_HYP);
		if (ret)
			return ret;

		end = (void *)per_cpu_ptr(&kvm_init_params, i)->stack_hyp_va;
		start = end - PAGE_SIZE;
		ret = pkvm_create_mappings(start, end, PAGE_HYP);
		if (ret)
			return ret;
	}

	/*
	 * Map the host's .bss and .rodata sections RO in the hypervisor, but
	 * transfer the ownership from the host to the hypervisor itself to
	 * make sure it can't be donated or shared with another entity.
	 *
	 * The ownership transition requires matching changes in the host
	 * stage-2. This will be done later (see finalize_host_mappings()) once
	 * the hyp_vmemmap is addressable.
	 */
	prot = pkvm_mkstate(PAGE_HYP_RO, PKVM_PAGE_SHARED_OWNED);
	ret = pkvm_create_mappings(__start_rodata, __end_rodata, prot);
	if (ret)
		return ret;

	ret = pkvm_create_mappings(__hyp_bss_end, __bss_stop, prot);
	if (ret)
		return ret;

	return 0;
}