1 files changed, 241 insertions, 37 deletions

diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c
index b7be96a53597..0f89157d31fd 100644
--- a/arch/arm64/kvm/pkvm.c
+++ b/arch/arm64/kvm/pkvm.c
@@ -7,6 +7,7 @@
 #include <linux/init.h>
 #include <linux/kmemleak.h>
 #include <linux/kvm_host.h>
+#include <asm/kvm_mmu.h>
 #include <linux/memblock.h>
 #include <linux/mutex.h>
 #include <linux/sort.h>
@@ -110,6 +111,29 @@ static void __pkvm_destroy_hyp_vm(struct kvm *host_kvm)
 
 	host_kvm->arch.pkvm.handle = 0;
 	free_hyp_memcache(&host_kvm->arch.pkvm.teardown_mc);
+	free_hyp_memcache(&host_kvm->arch.pkvm.stage2_teardown_mc);
+}
+
+static int __pkvm_create_hyp_vcpu(struct kvm_vcpu *vcpu)
+{
+	size_t hyp_vcpu_sz = PAGE_ALIGN(PKVM_HYP_VCPU_SIZE);
+	pkvm_handle_t handle = vcpu->kvm->arch.pkvm.handle;
+	void *hyp_vcpu;
+	int ret;
+
+	vcpu->arch.pkvm_memcache.flags |= HYP_MEMCACHE_ACCOUNT_STAGE2;
+
+	hyp_vcpu = alloc_pages_exact(hyp_vcpu_sz, GFP_KERNEL_ACCOUNT);
+	if (!hyp_vcpu)
+		return -ENOMEM;
+
+	ret = kvm_call_hyp_nvhe(__pkvm_init_vcpu, handle, vcpu, hyp_vcpu);
+	if (!ret)
+		vcpu_set_flag(vcpu, VCPU_PKVM_FINALIZED);
+	else
+		free_pages_exact(hyp_vcpu, hyp_vcpu_sz);
+
+	return ret;
 }
 
 /*
@@ -124,11 +148,8 @@ static void __pkvm_destroy_hyp_vm(struct kvm *host_kvm)
  */
 static int __pkvm_create_hyp_vm(struct kvm *host_kvm)
 {
-	size_t pgd_sz, hyp_vm_sz, hyp_vcpu_sz;
-	struct kvm_vcpu *host_vcpu;
-	pkvm_handle_t handle;
+	size_t pgd_sz, hyp_vm_sz;
 	void *pgd, *hyp_vm;
-	unsigned long idx;
 	int ret;
 
 	if (host_kvm->created_vcpus < 1)
@@ -160,40 +181,11 @@ static int __pkvm_create_hyp_vm(struct kvm *host_kvm)
 	if (ret < 0)
 		goto free_vm;
 
-	handle = ret;
-
-	host_kvm->arch.pkvm.handle = handle;
-
-	/* Donate memory for the vcpus at hyp and initialize it. */
-	hyp_vcpu_sz = PAGE_ALIGN(PKVM_HYP_VCPU_SIZE);
-	kvm_for_each_vcpu(idx, host_vcpu, host_kvm) {
-		void *hyp_vcpu;
-
-		/* Indexing of the vcpus to be sequential starting at 0. */
-		if (WARN_ON(host_vcpu->vcpu_idx != idx)) {
-			ret = -EINVAL;
-			goto destroy_vm;
-		}
-
-		hyp_vcpu = alloc_pages_exact(hyp_vcpu_sz, GFP_KERNEL_ACCOUNT);
-		if (!hyp_vcpu) {
-			ret = -ENOMEM;
-			goto destroy_vm;
-		}
-
-		ret = kvm_call_hyp_nvhe(__pkvm_init_vcpu, handle, host_vcpu,
-					hyp_vcpu);
-		if (ret) {
-			free_pages_exact(hyp_vcpu, hyp_vcpu_sz);
-			goto destroy_vm;
-		}
-	}
+	host_kvm->arch.pkvm.handle = ret;
+	host_kvm->arch.pkvm.stage2_teardown_mc.flags |= HYP_MEMCACHE_ACCOUNT_STAGE2;
+	kvm_account_pgtable_pages(pgd, pgd_sz / PAGE_SIZE);
 
 	return 0;
-
-destroy_vm:
-	__pkvm_destroy_hyp_vm(host_kvm);
-	return ret;
 free_vm:
 	free_pages_exact(hyp_vm, hyp_vm_sz);
 free_pgd:
@@ -213,6 +205,18 @@ int pkvm_create_hyp_vm(struct kvm *host_kvm)
 	return ret;
 }
 
+int pkvm_create_hyp_vcpu(struct kvm_vcpu *vcpu)
+{
+	int ret = 0;
+
+	mutex_lock(&vcpu->kvm->arch.config_lock);
+	if (!vcpu_get_flag(vcpu, VCPU_PKVM_FINALIZED))
+		ret = __pkvm_create_hyp_vcpu(vcpu);
+	mutex_unlock(&vcpu->kvm->arch.config_lock);
+
+	return ret;
+}
+
 void pkvm_destroy_hyp_vm(struct kvm *host_kvm)
 {
 	mutex_lock(&host_kvm->arch.config_lock);
@@ -222,7 +226,6 @@ void pkvm_destroy_hyp_vm(struct kvm *host_kvm)
 
 int pkvm_init_host_vm(struct kvm *host_kvm)
 {
-	mutex_init(&host_kvm->lock);
 	return 0;
 }
 
@@ -259,6 +262,7 @@ static int __init finalize_pkvm(void)
 	 * at, which would end badly once inaccessible.
 	 */
 	kmemleak_free_part(__hyp_bss_start, __hyp_bss_end - __hyp_bss_start);
+	kmemleak_free_part(__hyp_rodata_start, __hyp_rodata_end - __hyp_rodata_start);
 	kmemleak_free_part_phys(hyp_mem_base, hyp_mem_size);
 
 	ret = pkvm_drop_host_privileges();
@@ -268,3 +272,203 @@ static int __init finalize_pkvm(void)
 	return ret;
 }
 device_initcall_sync(finalize_pkvm);
+
+static int cmp_mappings(struct rb_node *node, const struct rb_node *parent)
+{
+	struct pkvm_mapping *a = rb_entry(node, struct pkvm_mapping, node);
+	struct pkvm_mapping *b = rb_entry(parent, struct pkvm_mapping, node);
+
+	if (a->gfn < b->gfn)
+		return -1;
+	if (a->gfn > b->gfn)
+		return 1;
+	return 0;
+}
+
+static struct rb_node *find_first_mapping_node(struct rb_root *root, u64 gfn)
+{
+	struct rb_node *node = root->rb_node, *prev = NULL;
+	struct pkvm_mapping *mapping;
+
+	while (node) {
+		mapping = rb_entry(node, struct pkvm_mapping, node);
+		if (mapping->gfn == gfn)
+			return node;
+		prev = node;
+		node = (gfn < mapping->gfn) ? node->rb_left : node->rb_right;
+	}
+
+	return prev;
+}
+
+/*
+ * __tmp is updated to rb_next(__tmp) *before* entering the body of the loop to allow freeing
+ * of __map inline.
+ */
+#define for_each_mapping_in_range_safe(__pgt, __start, __end, __map)				\
+	for (struct rb_node *__tmp = find_first_mapping_node(&(__pgt)->pkvm_mappings,		\
+							     ((__start) >> PAGE_SHIFT));	\
+	     __tmp && ({									\
+				__map = rb_entry(__tmp, struct pkvm_mapping, node);		\
+				__tmp = rb_next(__tmp);						\
+				true;								\
+		       });									\
+	    )											\
+		if (__map->gfn < ((__start) >> PAGE_SHIFT))					\
+			continue;								\
+		else if (__map->gfn >= ((__end) >> PAGE_SHIFT))					\
+			break;									\
+		else
+
+int pkvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu,
+			     struct kvm_pgtable_mm_ops *mm_ops)
+{
+	pgt->pkvm_mappings	= RB_ROOT;
+	pgt->mmu		= mmu;
+
+	return 0;
+}
+
+void pkvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(pgt->mmu);
+	pkvm_handle_t handle = kvm->arch.pkvm.handle;
+	struct pkvm_mapping *mapping;
+	struct rb_node *node;
+
+	if (!handle)
+		return;
+
+	node = rb_first(&pgt->pkvm_mappings);
+	while (node) {
+		mapping = rb_entry(node, struct pkvm_mapping, node);
+		kvm_call_hyp_nvhe(__pkvm_host_unshare_guest, handle, mapping->gfn);
+		node = rb_next(node);
+		rb_erase(&mapping->node, &pgt->pkvm_mappings);
+		kfree(mapping);
+	}
+}
+
+int pkvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
+			   u64 phys, enum kvm_pgtable_prot prot,
+			   void *mc, enum kvm_pgtable_walk_flags flags)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(pgt->mmu);
+	struct pkvm_mapping *mapping = NULL;
+	struct kvm_hyp_memcache *cache = mc;
+	u64 gfn = addr >> PAGE_SHIFT;
+	u64 pfn = phys >> PAGE_SHIFT;
+	int ret;
+
+	if (size != PAGE_SIZE)
+		return -EINVAL;
+
+	lockdep_assert_held_write(&kvm->mmu_lock);
+	ret = kvm_call_hyp_nvhe(__pkvm_host_share_guest, pfn, gfn, prot);
+	if (ret) {
+		/* Is the gfn already mapped due to a racing vCPU? */
+		if (ret == -EPERM)
+			return -EAGAIN;
+	}
+
+	swap(mapping, cache->mapping);
+	mapping->gfn = gfn;
+	mapping->pfn = pfn;
+	WARN_ON(rb_find_add(&mapping->node, &pgt->pkvm_mappings, cmp_mappings));
+
+	return ret;
+}
+
+int pkvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(pgt->mmu);
+	pkvm_handle_t handle = kvm->arch.pkvm.handle;
+	struct pkvm_mapping *mapping;
+	int ret = 0;
+
+	lockdep_assert_held_write(&kvm->mmu_lock);
+	for_each_mapping_in_range_safe(pgt, addr, addr + size, mapping) {
+		ret = kvm_call_hyp_nvhe(__pkvm_host_unshare_guest, handle, mapping->gfn);
+		if (WARN_ON(ret))
+			break;
+		rb_erase(&mapping->node, &pgt->pkvm_mappings);
+		kfree(mapping);
+	}
+
+	return ret;
+}
+
+int pkvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(pgt->mmu);
+	pkvm_handle_t handle = kvm->arch.pkvm.handle;
+	struct pkvm_mapping *mapping;
+	int ret = 0;
+
+	lockdep_assert_held(&kvm->mmu_lock);
+	for_each_mapping_in_range_safe(pgt, addr, addr + size, mapping) {
+		ret = kvm_call_hyp_nvhe(__pkvm_host_wrprotect_guest, handle, mapping->gfn);
+		if (WARN_ON(ret))
+			break;
+	}
+
+	return ret;
+}
+
+int pkvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(pgt->mmu);
+	struct pkvm_mapping *mapping;
+
+	lockdep_assert_held(&kvm->mmu_lock);
+	for_each_mapping_in_range_safe(pgt, addr, addr + size, mapping)
+		__clean_dcache_guest_page(pfn_to_kaddr(mapping->pfn), PAGE_SIZE);
+
+	return 0;
+}
+
+bool pkvm_pgtable_stage2_test_clear_young(struct kvm_pgtable *pgt, u64 addr, u64 size, bool mkold)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(pgt->mmu);
+	pkvm_handle_t handle = kvm->arch.pkvm.handle;
+	struct pkvm_mapping *mapping;
+	bool young = false;
+
+	lockdep_assert_held(&kvm->mmu_lock);
+	for_each_mapping_in_range_safe(pgt, addr, addr + size, mapping)
+		young |= kvm_call_hyp_nvhe(__pkvm_host_test_clear_young_guest, handle, mapping->gfn,
+					   mkold);
+
+	return young;
+}
+
+int pkvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr, enum kvm_pgtable_prot prot,
+				    enum kvm_pgtable_walk_flags flags)
+{
+	return kvm_call_hyp_nvhe(__pkvm_host_relax_perms_guest, addr >> PAGE_SHIFT, prot);
+}
+
+void pkvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr,
+				 enum kvm_pgtable_walk_flags flags)
+{
+	WARN_ON(kvm_call_hyp_nvhe(__pkvm_host_mkyoung_guest, addr >> PAGE_SHIFT));
+}
+
+void pkvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, s8 level)
+{
+	WARN_ON_ONCE(1);
+}
+
+kvm_pte_t *pkvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt, u64 phys, s8 level,
+					enum kvm_pgtable_prot prot, void *mc, bool force_pte)
+{
+	WARN_ON_ONCE(1);
+	return NULL;
+}
+
+int pkvm_pgtable_stage2_split(struct kvm_pgtable *pgt, u64 addr, u64 size,
+			      struct kvm_mmu_memory_cache *mc)
+{
+	WARN_ON_ONCE(1);
+	return -EINVAL;
+}