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-rw-r--r--arch/arm/kvm/mmu.c782
1 files changed, 782 insertions, 0 deletions
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
new file mode 100644
index 000000000000..99e07c7dd745
--- /dev/null
+++ b/arch/arm/kvm/mmu.c
@@ -0,0 +1,782 @@
+/*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/mman.h>
+#include <linux/kvm_host.h>
+#include <linux/io.h>
+#include <trace/events/kvm.h>
+#include <asm/idmap.h>
+#include <asm/pgalloc.h>
+#include <asm/cacheflush.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_mmio.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/mach/map.h>
+#include <trace/events/kvm.h>
+
+#include "trace.h"
+
+extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
+
+static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
+
+static void kvm_tlb_flush_vmid(struct kvm *kvm)
+{
+ kvm_call_hyp(__kvm_tlb_flush_vmid, kvm);
+}
+
+static void kvm_set_pte(pte_t *pte, pte_t new_pte)
+{
+ pte_val(*pte) = new_pte;
+ /*
+ * flush_pmd_entry just takes a void pointer and cleans the necessary
+ * cache entries, so we can reuse the function for ptes.
+ */
+ flush_pmd_entry(pte);
+}
+
+static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
+ int min, int max)
+{
+ void *page;
+
+ BUG_ON(max > KVM_NR_MEM_OBJS);
+ if (cache->nobjs >= min)
+ return 0;
+ while (cache->nobjs < max) {
+ page = (void *)__get_free_page(PGALLOC_GFP);
+ if (!page)
+ return -ENOMEM;
+ cache->objects[cache->nobjs++] = page;
+ }
+ return 0;
+}
+
+static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
+{
+ while (mc->nobjs)
+ free_page((unsigned long)mc->objects[--mc->nobjs]);
+}
+
+static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
+{
+ void *p;
+
+ BUG_ON(!mc || !mc->nobjs);
+ p = mc->objects[--mc->nobjs];
+ return p;
+}
+
+static void free_ptes(pmd_t *pmd, unsigned long addr)
+{
+ pte_t *pte;
+ unsigned int i;
+
+ for (i = 0; i < PTRS_PER_PMD; i++, addr += PMD_SIZE) {
+ if (!pmd_none(*pmd) && pmd_table(*pmd)) {
+ pte = pte_offset_kernel(pmd, addr);
+ pte_free_kernel(NULL, pte);
+ }
+ pmd++;
+ }
+}
+
+/**
+ * free_hyp_pmds - free a Hyp-mode level-2 tables and child level-3 tables
+ *
+ * Assumes this is a page table used strictly in Hyp-mode and therefore contains
+ * only mappings in the kernel memory area, which is above PAGE_OFFSET.
+ */
+void free_hyp_pmds(void)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ unsigned long addr;
+
+ mutex_lock(&kvm_hyp_pgd_mutex);
+ for (addr = PAGE_OFFSET; addr != 0; addr += PGDIR_SIZE) {
+ pgd = hyp_pgd + pgd_index(addr);
+ pud = pud_offset(pgd, addr);
+
+ if (pud_none(*pud))
+ continue;
+ BUG_ON(pud_bad(*pud));
+
+ pmd = pmd_offset(pud, addr);
+ free_ptes(pmd, addr);
+ pmd_free(NULL, pmd);
+ pud_clear(pud);
+ }
+ mutex_unlock(&kvm_hyp_pgd_mutex);
+}
+
+static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start,
+ unsigned long end)
+{
+ pte_t *pte;
+ unsigned long addr;
+ struct page *page;
+
+ for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) {
+ pte = pte_offset_kernel(pmd, addr);
+ BUG_ON(!virt_addr_valid(addr));
+ page = virt_to_page(addr);
+ kvm_set_pte(pte, mk_pte(page, PAGE_HYP));
+ }
+}
+
+static void create_hyp_io_pte_mappings(pmd_t *pmd, unsigned long start,
+ unsigned long end,
+ unsigned long *pfn_base)
+{
+ pte_t *pte;
+ unsigned long addr;
+
+ for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) {
+ pte = pte_offset_kernel(pmd, addr);
+ BUG_ON(pfn_valid(*pfn_base));
+ kvm_set_pte(pte, pfn_pte(*pfn_base, PAGE_HYP_DEVICE));
+ (*pfn_base)++;
+ }
+}
+
+static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start,
+ unsigned long end, unsigned long *pfn_base)
+{
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long addr, next;
+
+ for (addr = start; addr < end; addr = next) {
+ pmd = pmd_offset(pud, addr);
+
+ BUG_ON(pmd_sect(*pmd));
+
+ if (pmd_none(*pmd)) {
+ pte = pte_alloc_one_kernel(NULL, addr);
+ if (!pte) {
+ kvm_err("Cannot allocate Hyp pte\n");
+ return -ENOMEM;
+ }
+ pmd_populate_kernel(NULL, pmd, pte);
+ }
+
+ next = pmd_addr_end(addr, end);
+
+ /*
+ * If pfn_base is NULL, we map kernel pages into HYP with the
+ * virtual address. Otherwise, this is considered an I/O
+ * mapping and we map the physical region starting at
+ * *pfn_base to [start, end[.
+ */
+ if (!pfn_base)
+ create_hyp_pte_mappings(pmd, addr, next);
+ else
+ create_hyp_io_pte_mappings(pmd, addr, next, pfn_base);
+ }
+
+ return 0;
+}
+
+static int __create_hyp_mappings(void *from, void *to, unsigned long *pfn_base)
+{
+ unsigned long start = (unsigned long)from;
+ unsigned long end = (unsigned long)to;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ unsigned long addr, next;
+ int err = 0;
+
+ BUG_ON(start > end);
+ if (start < PAGE_OFFSET)
+ return -EINVAL;
+
+ mutex_lock(&kvm_hyp_pgd_mutex);
+ for (addr = start; addr < end; addr = next) {
+ pgd = hyp_pgd + pgd_index(addr);
+ pud = pud_offset(pgd, addr);
+
+ if (pud_none_or_clear_bad(pud)) {
+ pmd = pmd_alloc_one(NULL, addr);
+ if (!pmd) {
+ kvm_err("Cannot allocate Hyp pmd\n");
+ err = -ENOMEM;
+ goto out;
+ }
+ pud_populate(NULL, pud, pmd);
+ }
+
+ next = pgd_addr_end(addr, end);
+ err = create_hyp_pmd_mappings(pud, addr, next, pfn_base);
+ if (err)
+ goto out;
+ }
+out:
+ mutex_unlock(&kvm_hyp_pgd_mutex);
+ return err;
+}
+
+/**
+ * create_hyp_mappings - map a kernel virtual address range in Hyp mode
+ * @from: The virtual kernel start address of the range
+ * @to: The virtual kernel end address of the range (exclusive)
+ *
+ * The same virtual address as the kernel virtual address is also used in
+ * Hyp-mode mapping to the same underlying physical pages.
+ *
+ * Note: Wrapping around zero in the "to" address is not supported.
+ */
+int create_hyp_mappings(void *from, void *to)
+{
+ return __create_hyp_mappings(from, to, NULL);
+}
+
+/**
+ * create_hyp_io_mappings - map a physical IO range in Hyp mode
+ * @from: The virtual HYP start address of the range
+ * @to: The virtual HYP end address of the range (exclusive)
+ * @addr: The physical start address which gets mapped
+ */
+int create_hyp_io_mappings(void *from, void *to, phys_addr_t addr)
+{
+ unsigned long pfn = __phys_to_pfn(addr);
+ return __create_hyp_mappings(from, to, &pfn);
+}
+
+/**
+ * kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation.
+ * @kvm: The KVM struct pointer for the VM.
+ *
+ * Allocates the 1st level table only of size defined by S2_PGD_ORDER (can
+ * support either full 40-bit input addresses or limited to 32-bit input
+ * addresses). Clears the allocated pages.
+ *
+ * Note we don't need locking here as this is only called when the VM is
+ * created, which can only be done once.
+ */
+int kvm_alloc_stage2_pgd(struct kvm *kvm)
+{
+ pgd_t *pgd;
+
+ if (kvm->arch.pgd != NULL) {
+ kvm_err("kvm_arch already initialized?\n");
+ return -EINVAL;
+ }
+
+ pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, S2_PGD_ORDER);
+ if (!pgd)
+ return -ENOMEM;
+
+ /* stage-2 pgd must be aligned to its size */
+ VM_BUG_ON((unsigned long)pgd & (S2_PGD_SIZE - 1));
+
+ memset(pgd, 0, PTRS_PER_S2_PGD * sizeof(pgd_t));
+ clean_dcache_area(pgd, PTRS_PER_S2_PGD * sizeof(pgd_t));
+ kvm->arch.pgd = pgd;
+
+ return 0;
+}
+
+static void clear_pud_entry(pud_t *pud)
+{
+ pmd_t *pmd_table = pmd_offset(pud, 0);
+ pud_clear(pud);
+ pmd_free(NULL, pmd_table);
+ put_page(virt_to_page(pud));
+}
+
+static void clear_pmd_entry(pmd_t *pmd)
+{
+ pte_t *pte_table = pte_offset_kernel(pmd, 0);
+ pmd_clear(pmd);
+ pte_free_kernel(NULL, pte_table);
+ put_page(virt_to_page(pmd));
+}
+
+static bool pmd_empty(pmd_t *pmd)
+{
+ struct page *pmd_page = virt_to_page(pmd);
+ return page_count(pmd_page) == 1;
+}
+
+static void clear_pte_entry(pte_t *pte)
+{
+ if (pte_present(*pte)) {
+ kvm_set_pte(pte, __pte(0));
+ put_page(virt_to_page(pte));
+ }
+}
+
+static bool pte_empty(pte_t *pte)
+{
+ struct page *pte_page = virt_to_page(pte);
+ return page_count(pte_page) == 1;
+}
+
+/**
+ * unmap_stage2_range -- Clear stage2 page table entries to unmap a range
+ * @kvm: The VM pointer
+ * @start: The intermediate physical base address of the range to unmap
+ * @size: The size of the area to unmap
+ *
+ * Clear a range of stage-2 mappings, lowering the various ref-counts. Must
+ * be called while holding mmu_lock (unless for freeing the stage2 pgd before
+ * destroying the VM), otherwise another faulting VCPU may come in and mess
+ * with things behind our backs.
+ */
+static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ phys_addr_t addr = start, end = start + size;
+ u64 range;
+
+ while (addr < end) {
+ pgd = kvm->arch.pgd + pgd_index(addr);
+ pud = pud_offset(pgd, addr);
+ if (pud_none(*pud)) {
+ addr += PUD_SIZE;
+ continue;
+ }
+
+ pmd = pmd_offset(pud, addr);
+ if (pmd_none(*pmd)) {
+ addr += PMD_SIZE;
+ continue;
+ }
+
+ pte = pte_offset_kernel(pmd, addr);
+ clear_pte_entry(pte);
+ range = PAGE_SIZE;
+
+ /* If we emptied the pte, walk back up the ladder */
+ if (pte_empty(pte)) {
+ clear_pmd_entry(pmd);
+ range = PMD_SIZE;
+ if (pmd_empty(pmd)) {
+ clear_pud_entry(pud);
+ range = PUD_SIZE;
+ }
+ }
+
+ addr += range;
+ }
+}
+
+/**
+ * kvm_free_stage2_pgd - free all stage-2 tables
+ * @kvm: The KVM struct pointer for the VM.
+ *
+ * Walks the level-1 page table pointed to by kvm->arch.pgd and frees all
+ * underlying level-2 and level-3 tables before freeing the actual level-1 table
+ * and setting the struct pointer to NULL.
+ *
+ * Note we don't need locking here as this is only called when the VM is
+ * destroyed, which can only be done once.
+ */
+void kvm_free_stage2_pgd(struct kvm *kvm)
+{
+ if (kvm->arch.pgd == NULL)
+ return;
+
+ unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE);
+ free_pages((unsigned long)kvm->arch.pgd, S2_PGD_ORDER);
+ kvm->arch.pgd = NULL;
+}
+
+
+static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
+ phys_addr_t addr, const pte_t *new_pte, bool iomap)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte, old_pte;
+
+ /* Create 2nd stage page table mapping - Level 1 */
+ pgd = kvm->arch.pgd + pgd_index(addr);
+ pud = pud_offset(pgd, addr);
+ if (pud_none(*pud)) {
+ if (!cache)
+ return 0; /* ignore calls from kvm_set_spte_hva */
+ pmd = mmu_memory_cache_alloc(cache);
+ pud_populate(NULL, pud, pmd);
+ pmd += pmd_index(addr);
+ get_page(virt_to_page(pud));
+ } else
+ pmd = pmd_offset(pud, addr);
+
+ /* Create 2nd stage page table mapping - Level 2 */
+ if (pmd_none(*pmd)) {
+ if (!cache)
+ return 0; /* ignore calls from kvm_set_spte_hva */
+ pte = mmu_memory_cache_alloc(cache);
+ clean_pte_table(pte);
+ pmd_populate_kernel(NULL, pmd, pte);
+ pte += pte_index(addr);
+ get_page(virt_to_page(pmd));
+ } else
+ pte = pte_offset_kernel(pmd, addr);
+
+ if (iomap && pte_present(*pte))
+ return -EFAULT;
+
+ /* Create 2nd stage page table mapping - Level 3 */
+ old_pte = *pte;
+ kvm_set_pte(pte, *new_pte);
+ if (pte_present(old_pte))
+ kvm_tlb_flush_vmid(kvm);
+ else
+ get_page(virt_to_page(pte));
+
+ return 0;
+}
+
+/**
+ * kvm_phys_addr_ioremap - map a device range to guest IPA
+ *
+ * @kvm: The KVM pointer
+ * @guest_ipa: The IPA at which to insert the mapping
+ * @pa: The physical address of the device
+ * @size: The size of the mapping
+ */
+int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
+ phys_addr_t pa, unsigned long size)
+{
+ phys_addr_t addr, end;
+ int ret = 0;
+ unsigned long pfn;
+ struct kvm_mmu_memory_cache cache = { 0, };
+
+ end = (guest_ipa + size + PAGE_SIZE - 1) & PAGE_MASK;
+ pfn = __phys_to_pfn(pa);
+
+ for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) {
+ pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE | L_PTE_S2_RDWR);
+
+ ret = mmu_topup_memory_cache(&cache, 2, 2);
+ if (ret)
+ goto out;
+ spin_lock(&kvm->mmu_lock);
+ ret = stage2_set_pte(kvm, &cache, addr, &pte, true);
+ spin_unlock(&kvm->mmu_lock);
+ if (ret)
+ goto out;
+
+ pfn++;
+ }
+
+out:
+ mmu_free_memory_cache(&cache);
+ return ret;
+}
+
+static void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn)
+{
+ /*
+ * If we are going to insert an instruction page and the icache is
+ * either VIPT or PIPT, there is a potential problem where the host
+ * (or another VM) may have used the same page as this guest, and we
+ * read incorrect data from the icache. If we're using a PIPT cache,
+ * we can invalidate just that page, but if we are using a VIPT cache
+ * we need to invalidate the entire icache - damn shame - as written
+ * in the ARM ARM (DDI 0406C.b - Page B3-1393).
+ *
+ * VIVT caches are tagged using both the ASID and the VMID and doesn't
+ * need any kind of flushing (DDI 0406C.b - Page B3-1392).
+ */
+ if (icache_is_pipt()) {
+ unsigned long hva = gfn_to_hva(kvm, gfn);
+ __cpuc_coherent_user_range(hva, hva + PAGE_SIZE);
+ } else if (!icache_is_vivt_asid_tagged()) {
+ /* any kind of VIPT cache */
+ __flush_icache_all();
+ }
+}
+
+static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
+ gfn_t gfn, struct kvm_memory_slot *memslot,
+ unsigned long fault_status)
+{
+ pte_t new_pte;
+ pfn_t pfn;
+ int ret;
+ bool write_fault, writable;
+ unsigned long mmu_seq;
+ struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
+
+ write_fault = kvm_is_write_fault(vcpu->arch.hsr);
+ if (fault_status == FSC_PERM && !write_fault) {
+ kvm_err("Unexpected L2 read permission error\n");
+ return -EFAULT;
+ }
+
+ /* We need minimum second+third level pages */
+ ret = mmu_topup_memory_cache(memcache, 2, KVM_NR_MEM_OBJS);
+ if (ret)
+ return ret;
+
+ mmu_seq = vcpu->kvm->mmu_notifier_seq;
+ /*
+ * Ensure the read of mmu_notifier_seq happens before we call
+ * gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk
+ * the page we just got a reference to gets unmapped before we have a
+ * chance to grab the mmu_lock, which ensure that if the page gets
+ * unmapped afterwards, the call to kvm_unmap_hva will take it away
+ * from us again properly. This smp_rmb() interacts with the smp_wmb()
+ * in kvm_mmu_notifier_invalidate_<page|range_end>.
+ */
+ smp_rmb();
+
+ pfn = gfn_to_pfn_prot(vcpu->kvm, gfn, write_fault, &writable);
+ if (is_error_pfn(pfn))
+ return -EFAULT;
+
+ new_pte = pfn_pte(pfn, PAGE_S2);
+ coherent_icache_guest_page(vcpu->kvm, gfn);
+
+ spin_lock(&vcpu->kvm->mmu_lock);
+ if (mmu_notifier_retry(vcpu->kvm, mmu_seq))
+ goto out_unlock;
+ if (writable) {
+ pte_val(new_pte) |= L_PTE_S2_RDWR;
+ kvm_set_pfn_dirty(pfn);
+ }
+ stage2_set_pte(vcpu->kvm, memcache, fault_ipa, &new_pte, false);
+
+out_unlock:
+ spin_unlock(&vcpu->kvm->mmu_lock);
+ kvm_release_pfn_clean(pfn);
+ return 0;
+}
+
+/**
+ * kvm_handle_guest_abort - handles all 2nd stage aborts
+ * @vcpu: the VCPU pointer
+ * @run: the kvm_run structure
+ *
+ * Any abort that gets to the host is almost guaranteed to be caused by a
+ * missing second stage translation table entry, which can mean that either the
+ * guest simply needs more memory and we must allocate an appropriate page or it
+ * can mean that the guest tried to access I/O memory, which is emulated by user
+ * space. The distinction is based on the IPA causing the fault and whether this
+ * memory region has been registered as standard RAM by user space.
+ */
+int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ unsigned long hsr_ec;
+ unsigned long fault_status;
+ phys_addr_t fault_ipa;
+ struct kvm_memory_slot *memslot;
+ bool is_iabt;
+ gfn_t gfn;
+ int ret, idx;
+
+ hsr_ec = vcpu->arch.hsr >> HSR_EC_SHIFT;
+ is_iabt = (hsr_ec == HSR_EC_IABT);
+ fault_ipa = ((phys_addr_t)vcpu->arch.hpfar & HPFAR_MASK) << 8;
+
+ trace_kvm_guest_fault(*vcpu_pc(vcpu), vcpu->arch.hsr,
+ vcpu->arch.hxfar, fault_ipa);
+
+ /* Check the stage-2 fault is trans. fault or write fault */
+ fault_status = (vcpu->arch.hsr & HSR_FSC_TYPE);
+ if (fault_status != FSC_FAULT && fault_status != FSC_PERM) {
+ kvm_err("Unsupported fault status: EC=%#lx DFCS=%#lx\n",
+ hsr_ec, fault_status);
+ return -EFAULT;
+ }
+
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+ gfn = fault_ipa >> PAGE_SHIFT;
+ if (!kvm_is_visible_gfn(vcpu->kvm, gfn)) {
+ if (is_iabt) {
+ /* Prefetch Abort on I/O address */
+ kvm_inject_pabt(vcpu, vcpu->arch.hxfar);
+ ret = 1;
+ goto out_unlock;
+ }
+
+ if (fault_status != FSC_FAULT) {
+ kvm_err("Unsupported fault status on io memory: %#lx\n",
+ fault_status);
+ ret = -EFAULT;
+ goto out_unlock;
+ }
+
+ /* Adjust page offset */
+ fault_ipa |= vcpu->arch.hxfar & ~PAGE_MASK;
+ ret = io_mem_abort(vcpu, run, fault_ipa);
+ goto out_unlock;
+ }
+
+ memslot = gfn_to_memslot(vcpu->kvm, gfn);
+
+ ret = user_mem_abort(vcpu, fault_ipa, gfn, memslot, fault_status);
+ if (ret == 0)
+ ret = 1;
+out_unlock:
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
+ return ret;
+}
+
+static void handle_hva_to_gpa(struct kvm *kvm,
+ unsigned long start,
+ unsigned long end,
+ void (*handler)(struct kvm *kvm,
+ gpa_t gpa, void *data),
+ void *data)
+{
+ struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
+
+ slots = kvm_memslots(kvm);
+
+ /* we only care about the pages that the guest sees */
+ kvm_for_each_memslot(memslot, slots) {
+ unsigned long hva_start, hva_end;
+ gfn_t gfn, gfn_end;
+
+ hva_start = max(start, memslot->userspace_addr);
+ hva_end = min(end, memslot->userspace_addr +
+ (memslot->npages << PAGE_SHIFT));
+ if (hva_start >= hva_end)
+ continue;
+
+ /*
+ * {gfn(page) | page intersects with [hva_start, hva_end)} =
+ * {gfn_start, gfn_start+1, ..., gfn_end-1}.
+ */
+ gfn = hva_to_gfn_memslot(hva_start, memslot);
+ gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
+
+ for (; gfn < gfn_end; ++gfn) {
+ gpa_t gpa = gfn << PAGE_SHIFT;
+ handler(kvm, gpa, data);
+ }
+ }
+}
+
+static void kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data)
+{
+ unmap_stage2_range(kvm, gpa, PAGE_SIZE);
+ kvm_tlb_flush_vmid(kvm);
+}
+
+int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
+{
+ unsigned long end = hva + PAGE_SIZE;
+
+ if (!kvm->arch.pgd)
+ return 0;
+
+ trace_kvm_unmap_hva(hva);
+ handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL);
+ return 0;
+}
+
+int kvm_unmap_hva_range(struct kvm *kvm,
+ unsigned long start, unsigned long end)
+{
+ if (!kvm->arch.pgd)
+ return 0;
+
+ trace_kvm_unmap_hva_range(start, end);
+ handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL);
+ return 0;
+}
+
+static void kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data)
+{
+ pte_t *pte = (pte_t *)data;
+
+ stage2_set_pte(kvm, NULL, gpa, pte, false);
+}
+
+
+void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+{
+ unsigned long end = hva + PAGE_SIZE;
+ pte_t stage2_pte;
+
+ if (!kvm->arch.pgd)
+ return;
+
+ trace_kvm_set_spte_hva(hva);
+ stage2_pte = pfn_pte(pte_pfn(pte), PAGE_S2);
+ handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte);
+}
+
+void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu)
+{
+ mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
+}
+
+phys_addr_t kvm_mmu_get_httbr(void)
+{
+ VM_BUG_ON(!virt_addr_valid(hyp_pgd));
+ return virt_to_phys(hyp_pgd);
+}
+
+int kvm_mmu_init(void)
+{
+ if (!hyp_pgd) {
+ kvm_err("Hyp mode PGD not allocated\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/**
+ * kvm_clear_idmap - remove all idmaps from the hyp pgd
+ *
+ * Free the underlying pmds for all pgds in range and clear the pgds (but
+ * don't free them) afterwards.
+ */
+void kvm_clear_hyp_idmap(void)
+{
+ unsigned long addr, end;
+ unsigned long next;
+ pgd_t *pgd = hyp_pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ addr = virt_to_phys(__hyp_idmap_text_start);
+ end = virt_to_phys(__hyp_idmap_text_end);
+
+ pgd += pgd_index(addr);
+ do {
+ next = pgd_addr_end(addr, end);
+ if (pgd_none_or_clear_bad(pgd))
+ continue;
+ pud = pud_offset(pgd, addr);
+ pmd = pmd_offset(pud, addr);
+
+ pud_clear(pud);
+ clean_pmd_entry(pmd);
+ pmd_free(NULL, (pmd_t *)((unsigned long)pmd & PAGE_MASK));
+ } while (pgd++, addr = next, addr < end);
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.