return 0;
pfn = spte_to_pfn(old_spte);
+
+ /*
+ * KVM does not hold the refcount of the page used by
+ * kvm mmu, before reclaiming the page, we should
+ * unmap it from mmu first.
+ */
+ WARN_ON(!kvm_is_mmio_pfn(pfn) && !page_count(pfn_to_page(pfn)));
+
if (!shadow_accessed_mask || old_spte & shadow_accessed_mask)
kvm_set_pfn_accessed(pfn);
if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask))
static unsigned long *__gfn_to_rmap(gfn_t gfn, int level,
struct kvm_memory_slot *slot)
{
- struct kvm_lpage_info *linfo;
+ unsigned long idx;
if (likely(level == PT_PAGE_TABLE_LEVEL))
return &slot->rmap[gfn - slot->base_gfn];
- linfo = lpage_info_slot(gfn, slot, level);
- return &linfo->rmap_pde;
+ idx = gfn_to_index(gfn, slot->base_gfn, level);
+ return &slot->arch.rmap_pde[level - PT_DIRECTORY_LEVEL][idx];
}
/*
}
static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp,
- unsigned long data)
+ struct kvm_memory_slot *slot, unsigned long data)
{
u64 *sptep;
struct rmap_iterator iter;
}
static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp,
- unsigned long data)
+ struct kvm_memory_slot *slot, unsigned long data)
{
u64 *sptep;
struct rmap_iterator iter;
return 0;
}
-static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
- unsigned long data,
- int (*handler)(struct kvm *kvm, unsigned long *rmapp,
- unsigned long data))
+static int kvm_handle_hva_range(struct kvm *kvm,
+ unsigned long start,
+ unsigned long end,
+ unsigned long data,
+ int (*handler)(struct kvm *kvm,
+ unsigned long *rmapp,
+ struct kvm_memory_slot *slot,
+ unsigned long data))
{
int j;
- int ret;
- int retval = 0;
+ int ret = 0;
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
slots = kvm_memslots(kvm);
kvm_for_each_memslot(memslot, slots) {
- unsigned long start = memslot->userspace_addr;
- unsigned long end;
+ unsigned long hva_start, hva_end;
+ gfn_t gfn_start, gfn_end;
- end = start + (memslot->npages << PAGE_SHIFT);
- if (hva >= start && hva < end) {
- gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT;
- gfn_t gfn = memslot->base_gfn + gfn_offset;
+ 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_start = hva_to_gfn_memslot(hva_start, memslot);
+ gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
- ret = handler(kvm, &memslot->rmap[gfn_offset], data);
+ for (j = PT_PAGE_TABLE_LEVEL;
+ j < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++j) {
+ unsigned long idx, idx_end;
+ unsigned long *rmapp;
- for (j = 0; j < KVM_NR_PAGE_SIZES - 1; ++j) {
- struct kvm_lpage_info *linfo;
+ /*
+ * {idx(page_j) | page_j intersects with
+ * [hva_start, hva_end)} = {idx, idx+1, ..., idx_end}.
+ */
+ idx = gfn_to_index(gfn_start, memslot->base_gfn, j);
+ idx_end = gfn_to_index(gfn_end - 1, memslot->base_gfn, j);
- linfo = lpage_info_slot(gfn, memslot,
- PT_DIRECTORY_LEVEL + j);
- ret |= handler(kvm, &linfo->rmap_pde, data);
- }
- trace_kvm_age_page(hva, memslot, ret);
- retval |= ret;
+ rmapp = __gfn_to_rmap(gfn_start, j, memslot);
+
+ for (; idx <= idx_end; ++idx)
+ ret |= handler(kvm, rmapp++, memslot, data);
}
}
- return retval;
+ return ret;
+}
+
+static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
+ unsigned long data,
+ int (*handler)(struct kvm *kvm, unsigned long *rmapp,
+ struct kvm_memory_slot *slot,
+ unsigned long data))
+{
+ return kvm_handle_hva_range(kvm, hva, hva + 1, data, handler);
}
int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp);
}
+int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
+{
+ return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp);
+}
+
void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
{
kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp);
}
static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
- unsigned long data)
+ struct kvm_memory_slot *slot, unsigned long data)
{
u64 *sptep;
struct rmap_iterator uninitialized_var(iter);
* This has some overhead, but not as much as the cost of swapping
* out actively used pages or breaking up actively used hugepages.
*/
- if (!shadow_accessed_mask)
- return kvm_unmap_rmapp(kvm, rmapp, data);
+ if (!shadow_accessed_mask) {
+ young = kvm_unmap_rmapp(kvm, rmapp, slot, data);
+ goto out;
+ }
for (sptep = rmap_get_first(*rmapp, &iter); sptep;
sptep = rmap_get_next(&iter)) {
(unsigned long *)sptep);
}
}
-
+out:
+ /* @data has hva passed to kvm_age_hva(). */
+ trace_kvm_age_page(data, slot, young);
return young;
}
static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
- unsigned long data)
+ struct kvm_memory_slot *slot, unsigned long data)
{
u64 *sptep;
struct rmap_iterator iter;
rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
- kvm_unmap_rmapp(vcpu->kvm, rmapp, 0);
+ kvm_unmap_rmapp(vcpu->kvm, rmapp, NULL, 0);
kvm_flush_remote_tlbs(vcpu->kvm);
}
int kvm_age_hva(struct kvm *kvm, unsigned long hva)
{
- return kvm_handle_hva(kvm, hva, 0, kvm_age_rmapp);
+ return kvm_handle_hva(kvm, hva, hva, kvm_age_rmapp);
}
int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
unsigned long hva;
slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log);
- if (!slot) {
- get_page(fault_page);
- return page_to_pfn(fault_page);
- }
+ if (!slot)
+ return get_fault_pfn();
hva = gfn_to_hva_memslot(slot, gfn);
- return hva_to_pfn_atomic(vcpu->kvm, hva);
+ return hva_to_pfn_atomic(hva);
}
static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu,
projects / linux-imx.git / blobdiff