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 <linux/hugetlb.h>
23 #include <trace/events/kvm.h>
24 #include <asm/pgalloc.h>
25 #include <asm/cacheflush.h>
26 #include <asm/kvm_arm.h>
27 #include <asm/kvm_mmu.h>
28 #include <asm/kvm_mmio.h>
29 #include <asm/kvm_asm.h>
30 #include <asm/kvm_emulate.h>
34 extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
36 static pgd_t *boot_hyp_pgd;
37 static pgd_t *hyp_pgd;
38 static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
40 static void *init_bounce_page;
41 static unsigned long hyp_idmap_start;
42 static unsigned long hyp_idmap_end;
43 static phys_addr_t hyp_idmap_vector;
45 #define kvm_pmd_huge(_x) (pmd_huge(_x))
47 static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
50 * This function also gets called when dealing with HYP page
51 * tables. As HYP doesn't have an associated struct kvm (and
52 * the HYP page tables are fairly static), we don't do
56 kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
59 static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
64 BUG_ON(max > KVM_NR_MEM_OBJS);
65 if (cache->nobjs >= min)
67 while (cache->nobjs < max) {
68 page = (void *)__get_free_page(PGALLOC_GFP);
71 cache->objects[cache->nobjs++] = page;
76 static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
79 free_page((unsigned long)mc->objects[--mc->nobjs]);
82 static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
86 BUG_ON(!mc || !mc->nobjs);
87 p = mc->objects[--mc->nobjs];
91 static bool page_empty(void *ptr)
93 struct page *ptr_page = virt_to_page(ptr);
94 return page_count(ptr_page) == 1;
97 static void clear_pud_entry(struct kvm *kvm, pud_t *pud, phys_addr_t addr)
101 kvm_tlb_flush_vmid_ipa(kvm, addr);
103 pmd_t *pmd_table = pmd_offset(pud, 0);
105 kvm_tlb_flush_vmid_ipa(kvm, addr);
106 pmd_free(NULL, pmd_table);
108 put_page(virt_to_page(pud));
111 static void clear_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr)
113 if (kvm_pmd_huge(*pmd)) {
115 kvm_tlb_flush_vmid_ipa(kvm, addr);
117 pte_t *pte_table = pte_offset_kernel(pmd, 0);
119 kvm_tlb_flush_vmid_ipa(kvm, addr);
120 pte_free_kernel(NULL, pte_table);
122 put_page(virt_to_page(pmd));
125 static void clear_pte_entry(struct kvm *kvm, pte_t *pte, phys_addr_t addr)
127 if (pte_present(*pte)) {
128 kvm_set_pte(pte, __pte(0));
129 put_page(virt_to_page(pte));
130 kvm_tlb_flush_vmid_ipa(kvm, addr);
134 static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
135 unsigned long long start, u64 size)
141 unsigned long long addr = start, end = start + size;
145 pgd = pgdp + pgd_index(addr);
146 pud = pud_offset(pgd, addr);
147 if (pud_none(*pud)) {
148 addr = pud_addr_end(addr, end);
152 if (pud_huge(*pud)) {
154 * If we are dealing with a huge pud, just clear it and
157 clear_pud_entry(kvm, pud, addr);
158 addr = pud_addr_end(addr, end);
162 pmd = pmd_offset(pud, addr);
163 if (pmd_none(*pmd)) {
164 addr = pmd_addr_end(addr, end);
168 if (!kvm_pmd_huge(*pmd)) {
169 pte = pte_offset_kernel(pmd, addr);
170 clear_pte_entry(kvm, pte, addr);
171 next = addr + PAGE_SIZE;
175 * If the pmd entry is to be cleared, walk back up the ladder
177 if (kvm_pmd_huge(*pmd) || page_empty(pte)) {
178 clear_pmd_entry(kvm, pmd, addr);
179 next = pmd_addr_end(addr, end);
180 if (page_empty(pmd) && !page_empty(pud)) {
181 clear_pud_entry(kvm, pud, addr);
182 next = pud_addr_end(addr, end);
191 * free_boot_hyp_pgd - free HYP boot page tables
193 * Free the HYP boot page tables. The bounce page is also freed.
195 void free_boot_hyp_pgd(void)
197 mutex_lock(&kvm_hyp_pgd_mutex);
200 unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
201 unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
207 unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
209 kfree(init_bounce_page);
210 init_bounce_page = NULL;
212 mutex_unlock(&kvm_hyp_pgd_mutex);
216 * free_hyp_pgds - free Hyp-mode page tables
218 * Assumes hyp_pgd is a page table used strictly in Hyp-mode and
219 * therefore contains either mappings in the kernel memory area (above
220 * PAGE_OFFSET), or device mappings in the vmalloc range (from
221 * VMALLOC_START to VMALLOC_END).
223 * boot_hyp_pgd should only map two pages for the init code.
225 void free_hyp_pgds(void)
231 mutex_lock(&kvm_hyp_pgd_mutex);
234 for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE)
235 unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
236 for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
237 unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
243 mutex_unlock(&kvm_hyp_pgd_mutex);
246 static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start,
247 unsigned long end, unsigned long pfn,
255 pte = pte_offset_kernel(pmd, addr);
256 kvm_set_pte(pte, pfn_pte(pfn, prot));
257 get_page(virt_to_page(pte));
258 kvm_flush_dcache_to_poc(pte, sizeof(*pte));
260 } while (addr += PAGE_SIZE, addr != end);
263 static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start,
264 unsigned long end, unsigned long pfn,
269 unsigned long addr, next;
273 pmd = pmd_offset(pud, addr);
275 BUG_ON(pmd_sect(*pmd));
277 if (pmd_none(*pmd)) {
278 pte = pte_alloc_one_kernel(NULL, addr);
280 kvm_err("Cannot allocate Hyp pte\n");
283 pmd_populate_kernel(NULL, pmd, pte);
284 get_page(virt_to_page(pmd));
285 kvm_flush_dcache_to_poc(pmd, sizeof(*pmd));
288 next = pmd_addr_end(addr, end);
290 create_hyp_pte_mappings(pmd, addr, next, pfn, prot);
291 pfn += (next - addr) >> PAGE_SHIFT;
292 } while (addr = next, addr != end);
297 static int __create_hyp_mappings(pgd_t *pgdp,
298 unsigned long start, unsigned long end,
299 unsigned long pfn, pgprot_t prot)
304 unsigned long addr, next;
307 mutex_lock(&kvm_hyp_pgd_mutex);
308 addr = start & PAGE_MASK;
309 end = PAGE_ALIGN(end);
311 pgd = pgdp + pgd_index(addr);
312 pud = pud_offset(pgd, addr);
314 if (pud_none_or_clear_bad(pud)) {
315 pmd = pmd_alloc_one(NULL, addr);
317 kvm_err("Cannot allocate Hyp pmd\n");
321 pud_populate(NULL, pud, pmd);
322 get_page(virt_to_page(pud));
323 kvm_flush_dcache_to_poc(pud, sizeof(*pud));
326 next = pgd_addr_end(addr, end);
327 err = create_hyp_pmd_mappings(pud, addr, next, pfn, prot);
330 pfn += (next - addr) >> PAGE_SHIFT;
331 } while (addr = next, addr != end);
333 mutex_unlock(&kvm_hyp_pgd_mutex);
338 * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode
339 * @from: The virtual kernel start address of the range
340 * @to: The virtual kernel end address of the range (exclusive)
342 * The same virtual address as the kernel virtual address is also used
343 * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying
346 int create_hyp_mappings(void *from, void *to)
348 unsigned long phys_addr = virt_to_phys(from);
349 unsigned long start = KERN_TO_HYP((unsigned long)from);
350 unsigned long end = KERN_TO_HYP((unsigned long)to);
352 /* Check for a valid kernel memory mapping */
353 if (!virt_addr_valid(from) || !virt_addr_valid(to - 1))
356 return __create_hyp_mappings(hyp_pgd, start, end,
357 __phys_to_pfn(phys_addr), PAGE_HYP);
361 * create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode
362 * @from: The kernel start VA of the range
363 * @to: The kernel end VA of the range (exclusive)
364 * @phys_addr: The physical start address which gets mapped
366 * The resulting HYP VA is the same as the kernel VA, modulo
369 int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
371 unsigned long start = KERN_TO_HYP((unsigned long)from);
372 unsigned long end = KERN_TO_HYP((unsigned long)to);
374 /* Check for a valid kernel IO mapping */
375 if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1))
378 return __create_hyp_mappings(hyp_pgd, start, end,
379 __phys_to_pfn(phys_addr), PAGE_HYP_DEVICE);
383 * kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation.
384 * @kvm: The KVM struct pointer for the VM.
386 * Allocates the 1st level table only of size defined by S2_PGD_ORDER (can
387 * support either full 40-bit input addresses or limited to 32-bit input
388 * addresses). Clears the allocated pages.
390 * Note we don't need locking here as this is only called when the VM is
391 * created, which can only be done once.
393 int kvm_alloc_stage2_pgd(struct kvm *kvm)
397 if (kvm->arch.pgd != NULL) {
398 kvm_err("kvm_arch already initialized?\n");
402 pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, S2_PGD_ORDER);
406 memset(pgd, 0, PTRS_PER_S2_PGD * sizeof(pgd_t));
414 * unmap_stage2_range -- Clear stage2 page table entries to unmap a range
415 * @kvm: The VM pointer
416 * @start: The intermediate physical base address of the range to unmap
417 * @size: The size of the area to unmap
419 * Clear a range of stage-2 mappings, lowering the various ref-counts. Must
420 * be called while holding mmu_lock (unless for freeing the stage2 pgd before
421 * destroying the VM), otherwise another faulting VCPU may come in and mess
422 * with things behind our backs.
424 static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size)
426 unmap_range(kvm, kvm->arch.pgd, start, size);
430 * kvm_free_stage2_pgd - free all stage-2 tables
431 * @kvm: The KVM struct pointer for the VM.
433 * Walks the level-1 page table pointed to by kvm->arch.pgd and frees all
434 * underlying level-2 and level-3 tables before freeing the actual level-1 table
435 * and setting the struct pointer to NULL.
437 * Note we don't need locking here as this is only called when the VM is
438 * destroyed, which can only be done once.
440 void kvm_free_stage2_pgd(struct kvm *kvm)
442 if (kvm->arch.pgd == NULL)
445 unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE);
446 free_pages((unsigned long)kvm->arch.pgd, S2_PGD_ORDER);
447 kvm->arch.pgd = NULL;
450 static pmd_t *stage2_get_pmd(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
457 pgd = kvm->arch.pgd + pgd_index(addr);
458 pud = pud_offset(pgd, addr);
459 if (pud_none(*pud)) {
462 pmd = mmu_memory_cache_alloc(cache);
463 pud_populate(NULL, pud, pmd);
464 get_page(virt_to_page(pud));
467 return pmd_offset(pud, addr);
470 static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache
471 *cache, phys_addr_t addr, const pmd_t *new_pmd)
475 pmd = stage2_get_pmd(kvm, cache, addr);
479 * Mapping in huge pages should only happen through a fault. If a
480 * page is merged into a transparent huge page, the individual
481 * subpages of that huge page should be unmapped through MMU
482 * notifiers before we get here.
484 * Merging of CompoundPages is not supported; they should become
485 * splitting first, unmapped, merged, and mapped back in on-demand.
487 VM_BUG_ON(pmd_present(*pmd) && pmd_pfn(*pmd) != pmd_pfn(*new_pmd));
490 kvm_set_pmd(pmd, *new_pmd);
491 if (pmd_present(old_pmd))
492 kvm_tlb_flush_vmid_ipa(kvm, addr);
494 get_page(virt_to_page(pmd));
498 static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
499 phys_addr_t addr, const pte_t *new_pte, bool iomap)
504 /* Create stage-2 page table mapping - Level 1 */
505 pmd = stage2_get_pmd(kvm, cache, addr);
508 * Ignore calls from kvm_set_spte_hva for unallocated
514 /* Create stage-2 page mappings - Level 2 */
515 if (pmd_none(*pmd)) {
517 return 0; /* ignore calls from kvm_set_spte_hva */
518 pte = mmu_memory_cache_alloc(cache);
520 pmd_populate_kernel(NULL, pmd, pte);
521 get_page(virt_to_page(pmd));
524 pte = pte_offset_kernel(pmd, addr);
526 if (iomap && pte_present(*pte))
529 /* Create 2nd stage page table mapping - Level 3 */
531 kvm_set_pte(pte, *new_pte);
532 if (pte_present(old_pte))
533 kvm_tlb_flush_vmid_ipa(kvm, addr);
535 get_page(virt_to_page(pte));
541 * kvm_phys_addr_ioremap - map a device range to guest IPA
543 * @kvm: The KVM pointer
544 * @guest_ipa: The IPA at which to insert the mapping
545 * @pa: The physical address of the device
546 * @size: The size of the mapping
548 int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
549 phys_addr_t pa, unsigned long size)
551 phys_addr_t addr, end;
554 struct kvm_mmu_memory_cache cache = { 0, };
556 end = (guest_ipa + size + PAGE_SIZE - 1) & PAGE_MASK;
557 pfn = __phys_to_pfn(pa);
559 for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) {
560 pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE);
562 ret = mmu_topup_memory_cache(&cache, 2, 2);
565 spin_lock(&kvm->mmu_lock);
566 ret = stage2_set_pte(kvm, &cache, addr, &pte, true);
567 spin_unlock(&kvm->mmu_lock);
575 mmu_free_memory_cache(&cache);
579 static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
580 struct kvm_memory_slot *memslot,
581 unsigned long fault_status)
584 bool write_fault, writable, hugetlb = false;
585 unsigned long mmu_seq;
586 gfn_t gfn = fault_ipa >> PAGE_SHIFT;
587 unsigned long hva = gfn_to_hva(vcpu->kvm, gfn);
588 struct kvm *kvm = vcpu->kvm;
589 struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
590 struct vm_area_struct *vma;
593 write_fault = kvm_is_write_fault(kvm_vcpu_get_hsr(vcpu));
594 if (fault_status == FSC_PERM && !write_fault) {
595 kvm_err("Unexpected L2 read permission error\n");
599 /* Let's check if we will get back a huge page backed by hugetlbfs */
600 down_read(¤t->mm->mmap_sem);
601 vma = find_vma_intersection(current->mm, hva, hva + 1);
602 if (is_vm_hugetlb_page(vma)) {
604 gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT;
606 up_read(¤t->mm->mmap_sem);
608 /* We need minimum second+third level pages */
609 ret = mmu_topup_memory_cache(memcache, 2, KVM_NR_MEM_OBJS);
613 mmu_seq = vcpu->kvm->mmu_notifier_seq;
615 * Ensure the read of mmu_notifier_seq happens before we call
616 * gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk
617 * the page we just got a reference to gets unmapped before we have a
618 * chance to grab the mmu_lock, which ensure that if the page gets
619 * unmapped afterwards, the call to kvm_unmap_hva will take it away
620 * from us again properly. This smp_rmb() interacts with the smp_wmb()
621 * in kvm_mmu_notifier_invalidate_<page|range_end>.
625 pfn = gfn_to_pfn_prot(kvm, gfn, write_fault, &writable);
626 if (is_error_pfn(pfn))
629 spin_lock(&kvm->mmu_lock);
630 if (mmu_notifier_retry(kvm, mmu_seq))
634 pmd_t new_pmd = pfn_pmd(pfn, PAGE_S2);
635 new_pmd = pmd_mkhuge(new_pmd);
637 kvm_set_s2pmd_writable(&new_pmd);
638 kvm_set_pfn_dirty(pfn);
640 coherent_icache_guest_page(kvm, hva & PMD_MASK, PMD_SIZE);
641 ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd);
643 pte_t new_pte = pfn_pte(pfn, PAGE_S2);
645 kvm_set_s2pte_writable(&new_pte);
646 kvm_set_pfn_dirty(pfn);
648 coherent_icache_guest_page(kvm, hva, PAGE_SIZE);
649 ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, false);
654 spin_unlock(&kvm->mmu_lock);
655 kvm_release_pfn_clean(pfn);
660 * kvm_handle_guest_abort - handles all 2nd stage aborts
661 * @vcpu: the VCPU pointer
662 * @run: the kvm_run structure
664 * Any abort that gets to the host is almost guaranteed to be caused by a
665 * missing second stage translation table entry, which can mean that either the
666 * guest simply needs more memory and we must allocate an appropriate page or it
667 * can mean that the guest tried to access I/O memory, which is emulated by user
668 * space. The distinction is based on the IPA causing the fault and whether this
669 * memory region has been registered as standard RAM by user space.
671 int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
673 unsigned long fault_status;
674 phys_addr_t fault_ipa;
675 struct kvm_memory_slot *memslot;
680 is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
681 fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
683 trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
684 kvm_vcpu_get_hfar(vcpu), fault_ipa);
686 /* Check the stage-2 fault is trans. fault or write fault */
687 fault_status = kvm_vcpu_trap_get_fault(vcpu);
688 if (fault_status != FSC_FAULT && fault_status != FSC_PERM) {
689 kvm_err("Unsupported fault status: EC=%#x DFCS=%#lx\n",
690 kvm_vcpu_trap_get_class(vcpu), fault_status);
694 idx = srcu_read_lock(&vcpu->kvm->srcu);
696 gfn = fault_ipa >> PAGE_SHIFT;
697 if (!kvm_is_visible_gfn(vcpu->kvm, gfn)) {
699 /* Prefetch Abort on I/O address */
700 kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu));
705 if (fault_status != FSC_FAULT) {
706 kvm_err("Unsupported fault status on io memory: %#lx\n",
713 * The IPA is reported as [MAX:12], so we need to
714 * complement it with the bottom 12 bits from the
715 * faulting VA. This is always 12 bits, irrespective
718 fault_ipa |= kvm_vcpu_get_hfar(vcpu) & ((1 << 12) - 1);
719 ret = io_mem_abort(vcpu, run, fault_ipa);
723 memslot = gfn_to_memslot(vcpu->kvm, gfn);
725 ret = user_mem_abort(vcpu, fault_ipa, memslot, fault_status);
729 srcu_read_unlock(&vcpu->kvm->srcu, idx);
733 static void handle_hva_to_gpa(struct kvm *kvm,
736 void (*handler)(struct kvm *kvm,
737 gpa_t gpa, void *data),
740 struct kvm_memslots *slots;
741 struct kvm_memory_slot *memslot;
743 slots = kvm_memslots(kvm);
745 /* we only care about the pages that the guest sees */
746 kvm_for_each_memslot(memslot, slots) {
747 unsigned long hva_start, hva_end;
750 hva_start = max(start, memslot->userspace_addr);
751 hva_end = min(end, memslot->userspace_addr +
752 (memslot->npages << PAGE_SHIFT));
753 if (hva_start >= hva_end)
757 * {gfn(page) | page intersects with [hva_start, hva_end)} =
758 * {gfn_start, gfn_start+1, ..., gfn_end-1}.
760 gfn = hva_to_gfn_memslot(hva_start, memslot);
761 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
763 for (; gfn < gfn_end; ++gfn) {
764 gpa_t gpa = gfn << PAGE_SHIFT;
765 handler(kvm, gpa, data);
770 static void kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data)
772 unmap_stage2_range(kvm, gpa, PAGE_SIZE);
775 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
777 unsigned long end = hva + PAGE_SIZE;
782 trace_kvm_unmap_hva(hva);
783 handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL);
787 int kvm_unmap_hva_range(struct kvm *kvm,
788 unsigned long start, unsigned long end)
793 trace_kvm_unmap_hva_range(start, end);
794 handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL);
798 static void kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data)
800 pte_t *pte = (pte_t *)data;
802 stage2_set_pte(kvm, NULL, gpa, pte, false);
806 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
808 unsigned long end = hva + PAGE_SIZE;
814 trace_kvm_set_spte_hva(hva);
815 stage2_pte = pfn_pte(pte_pfn(pte), PAGE_S2);
816 handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte);
819 void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu)
821 mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
824 phys_addr_t kvm_mmu_get_httbr(void)
826 return virt_to_phys(hyp_pgd);
829 phys_addr_t kvm_mmu_get_boot_httbr(void)
831 return virt_to_phys(boot_hyp_pgd);
834 phys_addr_t kvm_get_idmap_vector(void)
836 return hyp_idmap_vector;
839 int kvm_mmu_init(void)
843 hyp_idmap_start = virt_to_phys(__hyp_idmap_text_start);
844 hyp_idmap_end = virt_to_phys(__hyp_idmap_text_end);
845 hyp_idmap_vector = virt_to_phys(__kvm_hyp_init);
847 if ((hyp_idmap_start ^ hyp_idmap_end) & PAGE_MASK) {
849 * Our init code is crossing a page boundary. Allocate
850 * a bounce page, copy the code over and use that.
852 size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
853 phys_addr_t phys_base;
855 init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
856 if (!init_bounce_page) {
857 kvm_err("Couldn't allocate HYP init bounce page\n");
862 memcpy(init_bounce_page, __hyp_idmap_text_start, len);
864 * Warning: the code we just copied to the bounce page
865 * must be flushed to the point of coherency.
866 * Otherwise, the data may be sitting in L2, and HYP
867 * mode won't be able to observe it as it runs with
868 * caches off at that point.
870 kvm_flush_dcache_to_poc(init_bounce_page, len);
872 phys_base = virt_to_phys(init_bounce_page);
873 hyp_idmap_vector += phys_base - hyp_idmap_start;
874 hyp_idmap_start = phys_base;
875 hyp_idmap_end = phys_base + len;
877 kvm_info("Using HYP init bounce page @%lx\n",
878 (unsigned long)phys_base);
881 hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
882 boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
883 if (!hyp_pgd || !boot_hyp_pgd) {
884 kvm_err("Hyp mode PGD not allocated\n");
889 /* Create the idmap in the boot page tables */
890 err = __create_hyp_mappings(boot_hyp_pgd,
891 hyp_idmap_start, hyp_idmap_end,
892 __phys_to_pfn(hyp_idmap_start),
896 kvm_err("Failed to idmap %lx-%lx\n",
897 hyp_idmap_start, hyp_idmap_end);
901 /* Map the very same page at the trampoline VA */
902 err = __create_hyp_mappings(boot_hyp_pgd,
903 TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,
904 __phys_to_pfn(hyp_idmap_start),
907 kvm_err("Failed to map trampoline @%lx into boot HYP pgd\n",
912 /* Map the same page again into the runtime page tables */
913 err = __create_hyp_mappings(hyp_pgd,
914 TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE,
915 __phys_to_pfn(hyp_idmap_start),
918 kvm_err("Failed to map trampoline @%lx into runtime HYP pgd\n",