2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 #include <linux/mman.h>
20 #include <linux/kvm_host.h>
22 #include <trace/events/kvm.h>
23 #include <asm/pgalloc.h>
24 #include <asm/cacheflush.h>
25 #include <asm/kvm_arm.h>
26 #include <asm/kvm_mmu.h>
27 #include <asm/kvm_mmio.h>
28 #include <asm/kvm_asm.h>
29 #include <asm/kvm_emulate.h>
33 extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
35 static pgd_t *boot_hyp_pgd;
36 static pgd_t *hyp_pgd;
37 static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
39 static void *init_bounce_page;
40 static unsigned long hyp_idmap_start;
41 static unsigned long hyp_idmap_end;
42 static phys_addr_t hyp_idmap_vector;
44 static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
47 * This function also gets called when dealing with HYP page
48 * tables. As HYP doesn't have an associated struct kvm (and
49 * the HYP page tables are fairly static), we don't do
53 kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
56 static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
61 BUG_ON(max > KVM_NR_MEM_OBJS);
62 if (cache->nobjs >= min)
64 while (cache->nobjs < max) {
65 page = (void *)__get_free_page(PGALLOC_GFP);
68 cache->objects[cache->nobjs++] = page;
73 static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
76 free_page((unsigned long)mc->objects[--mc->nobjs]);
79 static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
83 BUG_ON(!mc || !mc->nobjs);
84 p = mc->objects[--mc->nobjs];
88 static void clear_pud_entry(struct kvm *kvm, pud_t *pud, phys_addr_t addr)
90 pmd_t *pmd_table = pmd_offset(pud, 0);
92 kvm_tlb_flush_vmid_ipa(kvm, addr);
93 pmd_free(NULL, pmd_table);
94 put_page(virt_to_page(pud));
97 static void clear_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr)
99 pte_t *pte_table = pte_offset_kernel(pmd, 0);
101 kvm_tlb_flush_vmid_ipa(kvm, addr);
102 pte_free_kernel(NULL, pte_table);
103 put_page(virt_to_page(pmd));
106 static bool pmd_empty(pmd_t *pmd)
108 struct page *pmd_page = virt_to_page(pmd);
109 return page_count(pmd_page) == 1;
112 static void clear_pte_entry(struct kvm *kvm, pte_t *pte, phys_addr_t addr)
114 if (pte_present(*pte)) {
115 kvm_set_pte(pte, __pte(0));
116 put_page(virt_to_page(pte));
117 kvm_tlb_flush_vmid_ipa(kvm, addr);
121 static bool pte_empty(pte_t *pte)
123 struct page *pte_page = virt_to_page(pte);
124 return page_count(pte_page) == 1;
127 static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
128 unsigned long long start, u64 size)
134 unsigned long long addr = start, end = start + size;
138 pgd = pgdp + pgd_index(addr);
139 pud = pud_offset(pgd, addr);
140 if (pud_none(*pud)) {
145 pmd = pmd_offset(pud, addr);
146 if (pmd_none(*pmd)) {
151 pte = pte_offset_kernel(pmd, addr);
152 clear_pte_entry(kvm, pte, addr);
155 /* If we emptied the pte, walk back up the ladder */
156 if (pte_empty(pte)) {
157 clear_pmd_entry(kvm, pmd, addr);
159 if (pmd_empty(pmd)) {
160 clear_pud_entry(kvm, pud, addr);
170 * free_boot_hyp_pgd - free HYP boot page tables
172 * Free the HYP boot page tables. The bounce page is also freed.
174 void free_boot_hyp_pgd(void)
176 mutex_lock(&kvm_hyp_pgd_mutex);
179 unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
180 unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
186 unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
188 kfree(init_bounce_page);
189 init_bounce_page = NULL;
191 mutex_unlock(&kvm_hyp_pgd_mutex);
195 * free_hyp_pgds - free Hyp-mode page tables
197 * Assumes hyp_pgd is a page table used strictly in Hyp-mode and
198 * therefore contains either mappings in the kernel memory area (above
199 * PAGE_OFFSET), or device mappings in the vmalloc range (from
200 * VMALLOC_START to VMALLOC_END).
202 * boot_hyp_pgd should only map two pages for the init code.
204 void free_hyp_pgds(void)
210 mutex_lock(&kvm_hyp_pgd_mutex);
213 for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
214 unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
215 for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
216 unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
222 mutex_unlock(&kvm_hyp_pgd_mutex);
225 static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start,
226 unsigned long end, unsigned long pfn,
234 pte = pte_offset_kernel(pmd, addr);
235 kvm_set_pte(pte, pfn_pte(pfn, prot));
236 get_page(virt_to_page(pte));
237 kvm_flush_dcache_to_poc(pte, sizeof(*pte));
239 } while (addr += PAGE_SIZE, addr != end);
242 static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start,
243 unsigned long end, unsigned long pfn,
248 unsigned long addr, next;
252 pmd = pmd_offset(pud, addr);
254 BUG_ON(pmd_sect(*pmd));
256 if (pmd_none(*pmd)) {
257 pte = pte_alloc_one_kernel(NULL, addr);
259 kvm_err("Cannot allocate Hyp pte\n");
262 pmd_populate_kernel(NULL, pmd, pte);
263 get_page(virt_to_page(pmd));
264 kvm_flush_dcache_to_poc(pmd, sizeof(*pmd));
267 next = pmd_addr_end(addr, end);
269 create_hyp_pte_mappings(pmd, addr, next, pfn, prot);
270 pfn += (next - addr) >> PAGE_SHIFT;
271 } while (addr = next, addr != end);
276 static int __create_hyp_mappings(pgd_t *pgdp,
277 unsigned long start, unsigned long end,
278 unsigned long pfn, pgprot_t prot)
283 unsigned long addr, next;
286 mutex_lock(&kvm_hyp_pgd_mutex);
287 addr = start & PAGE_MASK;
288 end = PAGE_ALIGN(end);
290 pgd = pgdp + pgd_index(addr);
291 pud = pud_offset(pgd, addr);
293 if (pud_none_or_clear_bad(pud)) {
294 pmd = pmd_alloc_one(NULL, addr);
296 kvm_err("Cannot allocate Hyp pmd\n");
300 pud_populate(NULL, pud, pmd);
301 get_page(virt_to_page(pud));
302 kvm_flush_dcache_to_poc(pud, sizeof(*pud));
305 next = pgd_addr_end(addr, end);
306 err = create_hyp_pmd_mappings(pud, addr, next, pfn, prot);
309 pfn += (next - addr) >> PAGE_SHIFT;
310 } while (addr = next, addr != end);
312 mutex_unlock(&kvm_hyp_pgd_mutex);
316 static phys_addr_t kvm_kaddr_to_phys(void *kaddr)
318 if (!is_vmalloc_addr(kaddr)) {
319 BUG_ON(!virt_addr_valid(kaddr));
322 return page_to_phys(vmalloc_to_page(kaddr)) +
323 offset_in_page(kaddr);
328 * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode
329 * @from: The virtual kernel start address of the range
330 * @to: The virtual kernel end address of the range (exclusive)
332 * The same virtual address as the kernel virtual address is also used
333 * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying
336 int create_hyp_mappings(void *from, void *to)
338 phys_addr_t phys_addr;
339 unsigned long virt_addr;
340 unsigned long start = KERN_TO_HYP((unsigned long)from);
341 unsigned long end = KERN_TO_HYP((unsigned long)to);
343 start = start & PAGE_MASK;
344 end = PAGE_ALIGN(end);
346 for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) {
349 phys_addr = kvm_kaddr_to_phys(from + virt_addr - start);
350 err = __create_hyp_mappings(hyp_pgd, virt_addr,
351 virt_addr + PAGE_SIZE,
352 __phys_to_pfn(phys_addr),
362 * create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode
363 * @from: The kernel start VA of the range
364 * @to: The kernel end VA of the range (exclusive)
365 * @phys_addr: The physical start address which gets mapped
367 * The resulting HYP VA is the same as the kernel VA, modulo
370 int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
372 unsigned long start = KERN_TO_HYP((unsigned long)from);
373 unsigned long end = KERN_TO_HYP((unsigned long)to);
375 /* Check for a valid kernel IO mapping */
376 if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1))
379 return __create_hyp_mappings(hyp_pgd, start, end,
380 __phys_to_pfn(phys_addr), PAGE_HYP_DEVICE);
384 * kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation.
385 * @kvm: The KVM struct pointer for the VM.
387 * Allocates the 1st level table only of size defined by S2_PGD_ORDER (can
388 * support either full 40-bit input addresses or limited to 32-bit input
389 * addresses). Clears the allocated pages.
391 * Note we don't need locking here as this is only called when the VM is
392 * created, which can only be done once.
394 int kvm_alloc_stage2_pgd(struct kvm *kvm)
398 if (kvm->arch.pgd != NULL) {
399 kvm_err("kvm_arch already initialized?\n");
403 pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, S2_PGD_ORDER);
407 /* stage-2 pgd must be aligned to its size */
408 VM_BUG_ON((unsigned long)pgd & (S2_PGD_SIZE - 1));
410 memset(pgd, 0, PTRS_PER_S2_PGD * sizeof(pgd_t));
418 * unmap_stage2_range -- Clear stage2 page table entries to unmap a range
419 * @kvm: The VM pointer
420 * @start: The intermediate physical base address of the range to unmap
421 * @size: The size of the area to unmap
423 * Clear a range of stage-2 mappings, lowering the various ref-counts. Must
424 * be called while holding mmu_lock (unless for freeing the stage2 pgd before
425 * destroying the VM), otherwise another faulting VCPU may come in and mess
426 * with things behind our backs.
428 static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size)
430 unmap_range(kvm, kvm->arch.pgd, start, size);
434 * kvm_free_stage2_pgd - free all stage-2 tables
435 * @kvm: The KVM struct pointer for the VM.
437 * Walks the level-1 page table pointed to by kvm->arch.pgd and frees all
438 * underlying level-2 and level-3 tables before freeing the actual level-1 table
439 * and setting the struct pointer to NULL.
441 * Note we don't need locking here as this is only called when the VM is
442 * destroyed, which can only be done once.
444 void kvm_free_stage2_pgd(struct kvm *kvm)
446 if (kvm->arch.pgd == NULL)
449 unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE);
450 free_pages((unsigned long)kvm->arch.pgd, S2_PGD_ORDER);
451 kvm->arch.pgd = NULL;
455 static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
456 phys_addr_t addr, const pte_t *new_pte, bool iomap)
463 /* Create 2nd stage page table mapping - Level 1 */
464 pgd = kvm->arch.pgd + pgd_index(addr);
465 pud = pud_offset(pgd, addr);
466 if (pud_none(*pud)) {
468 return 0; /* ignore calls from kvm_set_spte_hva */
469 pmd = mmu_memory_cache_alloc(cache);
470 pud_populate(NULL, pud, pmd);
471 get_page(virt_to_page(pud));
474 pmd = pmd_offset(pud, addr);
476 /* Create 2nd stage page table mapping - Level 2 */
477 if (pmd_none(*pmd)) {
479 return 0; /* ignore calls from kvm_set_spte_hva */
480 pte = mmu_memory_cache_alloc(cache);
482 pmd_populate_kernel(NULL, pmd, pte);
483 get_page(virt_to_page(pmd));
486 pte = pte_offset_kernel(pmd, addr);
488 if (iomap && pte_present(*pte))
491 /* Create 2nd stage page table mapping - Level 3 */
493 kvm_set_pte(pte, *new_pte);
494 if (pte_present(old_pte))
495 kvm_tlb_flush_vmid_ipa(kvm, addr);
497 get_page(virt_to_page(pte));
503 * kvm_phys_addr_ioremap - map a device range to guest IPA
505 * @kvm: The KVM pointer
506 * @guest_ipa: The IPA at which to insert the mapping
507 * @pa: The physical address of the device
508 * @size: The size of the mapping
510 int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
511 phys_addr_t pa, unsigned long size)
513 phys_addr_t addr, end;
516 struct kvm_mmu_memory_cache cache = { 0, };
518 end = (guest_ipa + size + PAGE_SIZE - 1) & PAGE_MASK;
519 pfn = __phys_to_pfn(pa);
521 for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) {
522 pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE);
523 kvm_set_s2pte_writable(&pte);
525 ret = mmu_topup_memory_cache(&cache, 2, 2);
528 spin_lock(&kvm->mmu_lock);
529 ret = stage2_set_pte(kvm, &cache, addr, &pte, true);
530 spin_unlock(&kvm->mmu_lock);
538 mmu_free_memory_cache(&cache);
542 static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
543 gfn_t gfn, struct kvm_memory_slot *memslot,
544 unsigned long fault_status)
549 bool write_fault, writable;
550 unsigned long mmu_seq;
551 struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
553 write_fault = kvm_is_write_fault(kvm_vcpu_get_hsr(vcpu));
554 if (fault_status == FSC_PERM && !write_fault) {
555 kvm_err("Unexpected L2 read permission error\n");
559 /* We need minimum second+third level pages */
560 ret = mmu_topup_memory_cache(memcache, 2, KVM_NR_MEM_OBJS);
564 mmu_seq = vcpu->kvm->mmu_notifier_seq;
566 * Ensure the read of mmu_notifier_seq happens before we call
567 * gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk
568 * the page we just got a reference to gets unmapped before we have a
569 * chance to grab the mmu_lock, which ensure that if the page gets
570 * unmapped afterwards, the call to kvm_unmap_hva will take it away
571 * from us again properly. This smp_rmb() interacts with the smp_wmb()
572 * in kvm_mmu_notifier_invalidate_<page|range_end>.
576 pfn = gfn_to_pfn_prot(vcpu->kvm, gfn, write_fault, &writable);
577 if (is_error_pfn(pfn))
580 new_pte = pfn_pte(pfn, PAGE_S2);
581 coherent_icache_guest_page(vcpu->kvm, gfn);
583 spin_lock(&vcpu->kvm->mmu_lock);
584 if (mmu_notifier_retry(vcpu->kvm, mmu_seq))
587 kvm_set_s2pte_writable(&new_pte);
588 kvm_set_pfn_dirty(pfn);
590 stage2_set_pte(vcpu->kvm, memcache, fault_ipa, &new_pte, false);
593 spin_unlock(&vcpu->kvm->mmu_lock);
594 kvm_release_pfn_clean(pfn);
599 * kvm_handle_guest_abort - handles all 2nd stage aborts
600 * @vcpu: the VCPU pointer
601 * @run: the kvm_run structure
603 * Any abort that gets to the host is almost guaranteed to be caused by a
604 * missing second stage translation table entry, which can mean that either the
605 * guest simply needs more memory and we must allocate an appropriate page or it
606 * can mean that the guest tried to access I/O memory, which is emulated by user
607 * space. The distinction is based on the IPA causing the fault and whether this
608 * memory region has been registered as standard RAM by user space.
610 int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
612 unsigned long fault_status;
613 phys_addr_t fault_ipa;
614 struct kvm_memory_slot *memslot;
619 is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
620 fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
622 trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
623 kvm_vcpu_get_hfar(vcpu), fault_ipa);
625 /* Check the stage-2 fault is trans. fault or write fault */
626 fault_status = kvm_vcpu_trap_get_fault(vcpu);
627 if (fault_status != FSC_FAULT && fault_status != FSC_PERM) {
628 kvm_err("Unsupported fault status: EC=%#x DFCS=%#lx\n",
629 kvm_vcpu_trap_get_class(vcpu), fault_status);
633 idx = srcu_read_lock(&vcpu->kvm->srcu);
635 gfn = fault_ipa >> PAGE_SHIFT;
636 if (!kvm_is_visible_gfn(vcpu->kvm, gfn)) {
638 /* Prefetch Abort on I/O address */
639 kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu));
644 if (fault_status != FSC_FAULT) {
645 kvm_err("Unsupported fault status on io memory: %#lx\n",
652 * The IPA is reported as [MAX:12], so we need to
653 * complement it with the bottom 12 bits from the
654 * faulting VA. This is always 12 bits, irrespective
657 fault_ipa |= kvm_vcpu_get_hfar(vcpu) & ((1 << 12) - 1);
658 ret = io_mem_abort(vcpu, run, fault_ipa);
662 memslot = gfn_to_memslot(vcpu->kvm, gfn);
664 ret = user_mem_abort(vcpu, fault_ipa, gfn, memslot, fault_status);
668 srcu_read_unlock(&vcpu->kvm->srcu, idx);
672 static void handle_hva_to_gpa(struct kvm *kvm,
675 void (*handler)(struct kvm *kvm,
676 gpa_t gpa, void *data),
679 struct kvm_memslots *slots;
680 struct kvm_memory_slot *memslot;
682 slots = kvm_memslots(kvm);
684 /* we only care about the pages that the guest sees */
685 kvm_for_each_memslot(memslot, slots) {
686 unsigned long hva_start, hva_end;
689 hva_start = max(start, memslot->userspace_addr);
690 hva_end = min(end, memslot->userspace_addr +
691 (memslot->npages << PAGE_SHIFT));
692 if (hva_start >= hva_end)
696 * {gfn(page) | page intersects with [hva_start, hva_end)} =
697 * {gfn_start, gfn_start+1, ..., gfn_end-1}.
699 gfn = hva_to_gfn_memslot(hva_start, memslot);
700 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
702 for (; gfn < gfn_end; ++gfn) {
703 gpa_t gpa = gfn << PAGE_SHIFT;
704 handler(kvm, gpa, data);
709 static void kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data)
711 unmap_stage2_range(kvm, gpa, PAGE_SIZE);
714 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
716 unsigned long end = hva + PAGE_SIZE;
721 trace_kvm_unmap_hva(hva);
722 handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL);
726 int kvm_unmap_hva_range(struct kvm *kvm,
727 unsigned long start, unsigned long end)
732 trace_kvm_unmap_hva_range(start, end);
733 handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL);
737 static void kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data)
739 pte_t *pte = (pte_t *)data;
741 stage2_set_pte(kvm, NULL, gpa, pte, false);
745 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
747 unsigned long end = hva + PAGE_SIZE;
753 trace_kvm_set_spte_hva(hva);
754 stage2_pte = pfn_pte(pte_pfn(pte), PAGE_S2);
755 handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte);
758 void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu)
760 mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
763 phys_addr_t kvm_mmu_get_httbr(void)
765 return virt_to_phys(hyp_pgd);
768 phys_addr_t kvm_mmu_get_boot_httbr(void)
770 return virt_to_phys(boot_hyp_pgd);
773 phys_addr_t kvm_get_idmap_vector(void)
775 return hyp_idmap_vector;
778 int kvm_mmu_init(void)
782 hyp_idmap_start = virt_to_phys(__hyp_idmap_text_start);
783 hyp_idmap_end = virt_to_phys(__hyp_idmap_text_end);
784 hyp_idmap_vector = virt_to_phys(__kvm_hyp_init);
786 if ((hyp_idmap_start ^ hyp_idmap_end) & PAGE_MASK) {
788 * Our init code is crossing a page boundary. Allocate
789 * a bounce page, copy the code over and use that.
791 size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
792 phys_addr_t phys_base;
794 init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
795 if (!init_bounce_page) {
796 kvm_err("Couldn't allocate HYP init bounce page\n");
801 memcpy(init_bounce_page, __hyp_idmap_text_start, len);
803 * Warning: the code we just copied to the bounce page
804 * must be flushed to the point of coherency.
805 * Otherwise, the data may be sitting in L2, and HYP
806 * mode won't be able to observe it as it runs with
807 * caches off at that point.
809 kvm_flush_dcache_to_poc(init_bounce_page, len);
811 phys_base = virt_to_phys(init_bounce_page);
812 hyp_idmap_vector += phys_base - hyp_idmap_start;
813 hyp_idmap_start = phys_base;
814 hyp_idmap_end = phys_base + len;
816 kvm_info("Using HYP init bounce page @%lx\n",
817 (unsigned long)phys_base);
820 hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
821 boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
822 if (!hyp_pgd || !boot_hyp_pgd) {
823 kvm_err("Hyp mode PGD not allocated\n");
828 /* Create the idmap in the boot page tables */
829 err = __create_hyp_mappings(boot_hyp_pgd,
830 hyp_idmap_start, hyp_idmap_end,
831 __phys_to_pfn(hyp_idmap_start),
835 kvm_err("Failed to idmap %lx-%lx\n",
836 hyp_idmap_start, hyp_idmap_end);
840 /* Map the very same page at the trampoline VA */
841 err = __create_hyp_mappings(boot_hyp_pgd,
842 TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,
843 __phys_to_pfn(hyp_idmap_start),
846 kvm_err("Failed to map trampoline @%lx into boot HYP pgd\n",
851 /* Map the same page again into the runtime page tables */
852 err = __create_hyp_mappings(hyp_pgd,
853 TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,
854 __phys_to_pfn(hyp_idmap_start),
857 kvm_err("Failed to map trampoline @%lx into runtime HYP pgd\n",