diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index e4934f5e4234..9266b17f8ba9 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -57,6 +57,10 @@
 #define __KVM_HOST_SMCCC_FUNC___kvm_get_mdcr_el2		12
 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs		13
 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_aprs		14
+#define __KVM_HOST_SMCCC_FUNC___kvm_hyp_protect			15
+#define __KVM_HOST_SMCCC_FUNC___hyp_create_mappings		16
+#define __KVM_HOST_SMCCC_FUNC___hyp_create_private_mapping	17
+#define __KVM_HOST_SMCCC_FUNC___hyp_cpu_set_vector		18
 
 #ifndef __ASSEMBLY__
 
@@ -171,7 +175,7 @@ struct kvm_vcpu;
 struct kvm_s2_mmu;
 
 DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
-DECLARE_KVM_NVHE_SYM(__kvm_hyp_host_vector);
+DECLARE_KVM_HYP_SYM(__kvm_hyp_host_vector);
 DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
 #define __kvm_hyp_init			CHOOSE_NVHE_SYM(__kvm_hyp_init)
 #define __kvm_hyp_host_vector		CHOOSE_NVHE_SYM(__kvm_hyp_host_vector)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 7a5d5f4b3351..ee8bb8021637 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -742,4 +742,12 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu);
 #define kvm_vcpu_has_pmu(vcpu)					\
 	(test_bit(KVM_ARM_VCPU_PMU_V3, (vcpu)->arch.features))
 
+#ifdef CONFIG_KVM
+extern phys_addr_t hyp_mem_base;
+extern phys_addr_t hyp_mem_size;
+void __init reserve_kvm_hyp(void);
+#else
+static inline void reserve_kvm_hyp(void) { }
+#endif
+
 #endif /* __ARM64_KVM_HOST_H__ */
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index 95a2bbbcc7e1..dbd2ef86afa9 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -105,5 +105,13 @@ void __noreturn hyp_panic(void);
 void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
 #endif
 
+#ifdef __KVM_NVHE_HYPERVISOR__
+void __kvm_init_switch_pgd(phys_addr_t phys, unsigned long size,
+			   phys_addr_t pgd, void *sp, void *cont_fn);
+int __kvm_hyp_protect(phys_addr_t phys, unsigned long size,
+		      unsigned long nr_cpus, unsigned long *per_cpu_base);
+void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
+#endif
+
 #endif /* __ARM64_KVM_HYP_H__ */
 
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 3bc86d1423f8..010458f6d799 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1722,7 +1722,7 @@ static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap)
 #endif /* CONFIG_ARM64_MTE */
 
 #ifdef CONFIG_KVM
-static bool enable_protected_kvm;
+bool enable_protected_kvm;
 
 static bool has_protected_kvm(const struct arm64_cpu_capabilities *entry, int __unused)
 {
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index c35d768672eb..f2d43e6cd86d 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -118,6 +118,25 @@ __kvm_nvhe___memset			= __kvm_nvhe___pi_memset;
 
 _kvm_nvhe___flush_dcache_area		= __kvm_nvhe___pi___flush_dcache_area;
 
+/* Hypevisor VA size */
+KVM_NVHE_ALIAS(hyp_va_bits);
+
+/* Kernel memory sections */
+KVM_NVHE_ALIAS(__start_rodata);
+KVM_NVHE_ALIAS(__end_rodata);
+KVM_NVHE_ALIAS(__bss_start);
+KVM_NVHE_ALIAS(__bss_stop);
+
+/* Hyp memory sections */
+KVM_NVHE_ALIAS(__hyp_idmap_text_start);
+KVM_NVHE_ALIAS(__hyp_idmap_text_end);
+KVM_NVHE_ALIAS(__hyp_text_start);
+KVM_NVHE_ALIAS(__hyp_text_end);
+KVM_NVHE_ALIAS(__hyp_data_ro_after_init_start);
+KVM_NVHE_ALIAS(__hyp_data_ro_after_init_end);
+KVM_NVHE_ALIAS(__hyp_bss_start);
+KVM_NVHE_ALIAS(__hyp_bss_end);
+
 #endif /* CONFIG_KVM */
 
 #endif /* __ARM64_KERNEL_IMAGE_VARS_H */
diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
index 687598e41b21..b726332eec49 100644
--- a/arch/arm64/kvm/hyp/Makefile
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -10,4 +10,4 @@ subdir-ccflags-y := -I$(incdir)				\
 		    -DDISABLE_BRANCH_PROFILING		\
 		    $(DISABLE_STACKLEAK_PLUGIN)
 
-obj-$(CONFIG_KVM) += vhe/ nvhe/ pgtable.o
+obj-$(CONFIG_KVM) += vhe/ nvhe/ pgtable.o reserved_mem.o
diff --git a/arch/arm64/kvm/hyp/include/nvhe/memory.h b/arch/arm64/kvm/hyp/include/nvhe/memory.h
index ed47674bc988..c8af6fe87bfb 100644
--- a/arch/arm64/kvm/hyp/include/nvhe/memory.h
+++ b/arch/arm64/kvm/hyp/include/nvhe/memory.h
@@ -6,6 +6,12 @@
 
 #include <linux/types.h>
 
+#define HYP_MEMBLOCK_REGIONS 128
+struct hyp_memblock_region {
+	phys_addr_t start;
+	phys_addr_t end;
+};
+
 struct hyp_pool;
 struct hyp_page {
 	unsigned int refcount;
diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h
new file mode 100644
index 000000000000..5a3ad6f4e5bc
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __KVM_HYP_MM_H
+#define __KVM_HYP_MM_H
+
+#include <asm/kvm_pgtable.h>
+#include <asm/spectre.h>
+#include <linux/types.h>
+
+#include <nvhe/memory.h>
+#include <nvhe/spinlock.h>
+
+extern struct hyp_memblock_region kvm_nvhe_sym(hyp_memory)[];
+extern int kvm_nvhe_sym(hyp_memblock_nr);
+extern struct kvm_pgtable hyp_pgtable;
+extern hyp_spinlock_t __hyp_pgd_lock;
+extern struct hyp_pool hpool;
+extern u64 __io_map_base;
+extern u32 hyp_va_bits;
+
+int hyp_create_idmap(void);
+int hyp_map_vectors(void);
+int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back);
+int hyp_cpu_set_vector(enum arm64_hyp_spectre_vector slot);
+int hyp_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot);
+int __hyp_create_mappings(unsigned long start, unsigned long size,
+			  unsigned long phys, unsigned long prot);
+unsigned long __hyp_create_private_mapping(phys_addr_t phys, size_t size,
+					   unsigned long prot);
+
+static inline void hyp_vmemmap_range(phys_addr_t phys, unsigned long size,
+				     unsigned long *start, unsigned long *end)
+{
+	unsigned long nr_pages = size >> PAGE_SHIFT;
+	struct hyp_page *p = hyp_phys_to_page(phys);
+
+	*start = (unsigned long)p;
+	*end = *start + nr_pages * sizeof(struct hyp_page);
+	*start = ALIGN_DOWN(*start, PAGE_SIZE);
+	*end = ALIGN(*end, PAGE_SIZE);
+}
+
+static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
+{
+	unsigned long total = 0, i;
+
+	/* Provision the worst case scenario with 4 levels of page-table */
+	for (i = 0; i < 4; i++) {
+		nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
+		total += nr_pages;
+	}
+
+	return total;
+}
+
+static inline unsigned long hyp_s1_pgtable_size(void)
+{
+	struct hyp_memblock_region *reg;
+	unsigned long nr_pages, res = 0;
+	int i;
+
+	if (kvm_nvhe_sym(hyp_memblock_nr) <= 0)
+		return 0;
+
+	for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
+		reg = &kvm_nvhe_sym(hyp_memory)[i];
+		nr_pages = (reg->end - reg->start) >> PAGE_SHIFT;
+		nr_pages = __hyp_pgtable_max_pages(nr_pages);
+		res += nr_pages << PAGE_SHIFT;
+	}
+
+	/* Allow 1 GiB for private mappings */
+	nr_pages = (1 << 30) >> PAGE_SHIFT;
+	nr_pages = __hyp_pgtable_max_pages(nr_pages);
+	res += nr_pages << PAGE_SHIFT;
+
+	return res;
+}
+
+#endif /* __KVM_HYP_MM_H */
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 72cfe53f106f..d7381a503182 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -11,9 +11,9 @@ lib-objs := $(addprefix ../../../lib/, $(lib-objs))
 
 obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
 	 hyp-main.o hyp-smp.o psci-relay.o early_alloc.o stub.o page_alloc.o \
-	 cache.o cpufeature.o
+	 cache.o cpufeature.o setup.o mm.o
 obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
-	 ../fpsimd.o ../hyp-entry.o ../exception.o
+	 ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o
 obj-y += $(lib-objs)
 
 ##
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
index 8f3602f320ac..e2d62297edfe 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -247,4 +247,34 @@ alternative_else_nop_endif
 
 SYM_CODE_END(__kvm_handle_stub_hvc)
 
+SYM_FUNC_START(__kvm_init_switch_pgd)
+	/* Turn the MMU off */
+	pre_disable_mmu_workaround
+	mrs	x2, sctlr_el2
+	bic	x3, x2, #SCTLR_ELx_M
+	msr	sctlr_el2, x3
+	isb
+
+	tlbi	alle2
+
+	/* Install the new pgtables */
+	ldr	x3, [x0, #NVHE_INIT_PGD_PA]
+	phys_to_ttbr x4, x3
+alternative_if ARM64_HAS_CNP
+	orr	x4, x4, #TTBR_CNP_BIT
+alternative_else_nop_endif
+	msr	ttbr0_el2, x4
+
+	/* Set the new stack pointer */
+	ldr	x0, [x0, #NVHE_INIT_STACK_HYP_VA]
+	mov	sp, x0
+
+	/* And turn the MMU back on! */
+	dsb	nsh
+	isb
+	msr	sctlr_el2, x2
+	isb
+	ret	x1
+SYM_FUNC_END(__kvm_init_switch_pgd)
+
 	.popsection
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index 933329699425..a0bfe0d26da6 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -6,12 +6,15 @@
 
 #include <hyp/switch.h>
 
+#include <asm/pgtable-types.h>
 #include <asm/kvm_asm.h>
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_host.h>
 #include <asm/kvm_hyp.h>
 #include <asm/kvm_mmu.h>
 
+#include <nvhe/mm.h>
+
 DEFINE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
 
 #define cpu_reg(ctxt, r)	(ctxt)->regs.regs[r]
@@ -106,6 +109,43 @@ static void handle___vgic_v3_restore_aprs(struct kvm_cpu_context *host_ctxt)
 	__vgic_v3_restore_aprs(kern_hyp_va(cpu_if));
 }
 
+static void handle___kvm_hyp_protect(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
+	DECLARE_REG(unsigned long, size, host_ctxt, 2);
+	DECLARE_REG(unsigned long, nr_cpus, host_ctxt, 3);
+	DECLARE_REG(unsigned long *, per_cpu_base, host_ctxt, 4);
+
+	cpu_reg(host_ctxt, 1) = __kvm_hyp_protect(phys, size, nr_cpus,
+						  per_cpu_base);
+}
+
+static void handle___hyp_cpu_set_vector(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(enum arm64_hyp_spectre_vector, slot, host_ctxt, 1);
+
+	cpu_reg(host_ctxt, 1) = hyp_cpu_set_vector(slot);
+}
+
+static void handle___hyp_create_mappings(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(unsigned long, start, host_ctxt, 1);
+	DECLARE_REG(unsigned long, size, host_ctxt, 2);
+	DECLARE_REG(unsigned long, phys, host_ctxt, 3);
+	DECLARE_REG(unsigned long, prot, host_ctxt, 4);
+
+	cpu_reg(host_ctxt, 1) = __hyp_create_mappings(start, size, phys, prot);
+}
+
+static void handle___hyp_create_private_mapping(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
+	DECLARE_REG(size_t, size, host_ctxt, 2);
+	DECLARE_REG(unsigned long, prot, host_ctxt, 3);
+
+	cpu_reg(host_ctxt, 1) = __hyp_create_private_mapping(phys, size, prot);
+}
+
 typedef void (*hcall_t)(struct kvm_cpu_context *);
 
 #define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = kimg_fn_ptr(handle_##x)
@@ -125,6 +165,10 @@ static const hcall_t *host_hcall[] = {
 	HANDLE_FUNC(__kvm_get_mdcr_el2),
 	HANDLE_FUNC(__vgic_v3_save_aprs),
 	HANDLE_FUNC(__vgic_v3_restore_aprs),
+	HANDLE_FUNC(__kvm_hyp_protect),
+	HANDLE_FUNC(__hyp_cpu_set_vector),
+	HANDLE_FUNC(__hyp_create_mappings),
+	HANDLE_FUNC(__hyp_create_private_mapping),
 };
 
 static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c
new file mode 100644
index 000000000000..cad5dae197c6
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/mm.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_pgtable.h>
+#include <asm/spectre.h>
+
+#include <nvhe/early_alloc.h>
+#include <nvhe/gfp.h>
+#include <nvhe/memory.h>
+#include <nvhe/mm.h>
+#include <nvhe/spinlock.h>
+
+struct kvm_pgtable hyp_pgtable;
+
+hyp_spinlock_t __hyp_pgd_lock;
+u64 __io_map_base;
+
+struct hyp_memblock_region hyp_memory[HYP_MEMBLOCK_REGIONS];
+int hyp_memblock_nr;
+
+int __hyp_create_mappings(unsigned long start, unsigned long size,
+			  unsigned long phys, unsigned long prot)
+{
+	int err;
+
+	hyp_spin_lock(&__hyp_pgd_lock);
+	err = kvm_pgtable_hyp_map(&hyp_pgtable, start, size, phys, prot);
+	hyp_spin_unlock(&__hyp_pgd_lock);
+
+	return err;
+}
+
+unsigned long __hyp_create_private_mapping(phys_addr_t phys, size_t size,
+					   unsigned long prot)
+{
+	unsigned long addr;
+	int ret;
+
+	hyp_spin_lock(&__hyp_pgd_lock);
+
+	size = PAGE_ALIGN(size + offset_in_page(phys));
+	addr = __io_map_base;
+	__io_map_base += size;
+
+	/* Are we overflowing on the vmemmap ? */
+	if (__io_map_base > __hyp_vmemmap) {
+		__io_map_base -= size;
+		addr = 0;
+		goto out;
+	}
+
+	ret = kvm_pgtable_hyp_map(&hyp_pgtable, addr, size, phys, prot);
+	if (ret) {
+		addr = 0;
+		goto out;
+	}
+
+	addr = addr + offset_in_page(phys);
+out:
+	hyp_spin_unlock(&__hyp_pgd_lock);
+
+	return addr;
+}
+
+int hyp_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot)
+{
+	unsigned long start = (unsigned long)from;
+	unsigned long end = (unsigned long)to;
+	unsigned long virt_addr;
+	phys_addr_t phys;
+
+	start = start & PAGE_MASK;
+	end = PAGE_ALIGN(end);
+
+	for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) {
+		int err;
+
+		phys = hyp_virt_to_phys((void *)virt_addr);
+		err = __hyp_create_mappings(virt_addr, PAGE_SIZE, phys, prot);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back)
+{
+	unsigned long start, end;
+
+	hyp_vmemmap_range(phys, size, &start, &end);
+
+	return __hyp_create_mappings(start, end - start, back, PAGE_HYP);
+}
+
+static void *__hyp_bp_vect_base;
+int hyp_cpu_set_vector(enum arm64_hyp_spectre_vector slot)
+{
+	void *vector;
+
+	switch (slot) {
+	case HYP_VECTOR_DIRECT: {
+		vector = hyp_symbol_addr(__kvm_hyp_vector);
+		break;
+	}
+	case HYP_VECTOR_SPECTRE_DIRECT: {
+		vector = hyp_symbol_addr(__bp_harden_hyp_vecs);
+		break;
+	}
+	case HYP_VECTOR_INDIRECT:
+	case HYP_VECTOR_SPECTRE_INDIRECT: {
+		vector = (void *)__hyp_bp_vect_base;
+		break;
+	}
+	default:
+		return -EINVAL;
+	}
+
+	vector = __kvm_vector_slot2addr(vector, slot);
+	*this_cpu_ptr(&kvm_hyp_vector) = (unsigned long)vector;
+
+	return 0;
+}
+
+int hyp_map_vectors(void)
+{
+	unsigned long bp_base;
+
+	if (!cpus_have_const_cap(ARM64_SPECTRE_V3A))
+		return 0;
+
+	bp_base = (unsigned long)hyp_symbol_addr(__bp_harden_hyp_vecs);
+	bp_base = __hyp_pa(bp_base);
+	bp_base = __hyp_create_private_mapping(bp_base, __BP_HARDEN_HYP_VECS_SZ,
+					       PAGE_HYP_EXEC);
+	if (!bp_base)
+		return -1;
+
+	__hyp_bp_vect_base = (void *)bp_base;
+
+	return 0;
+}
+
+int hyp_create_idmap(void)
+{
+	unsigned long start, end;
+
+	start = (unsigned long)hyp_symbol_addr(__hyp_idmap_text_start);
+	start = hyp_virt_to_phys((void *)start);
+	start = ALIGN_DOWN(start, PAGE_SIZE);
+
+	end = (unsigned long)hyp_symbol_addr(__hyp_idmap_text_end);
+	end = hyp_virt_to_phys((void *)end);
+	end = ALIGN(end, PAGE_SIZE);
+
+	/*
+	 * One half of the VA space is reserved to linearly map portions of
+	 * memory -- see va_layout.c for more details. The other half of the VA
+	 * space contains the trampoline page, and needs some care. Split that
+	 * second half in two and find the quarter of VA space not conflicting
+	 * with the idmap to place the IOs and the vmemmap. IOs use the lower
+	 * half of the quarter and the vmemmap the upper half.
+	 */
+	__io_map_base = start & BIT(hyp_va_bits - 2);
+	__io_map_base ^= BIT(hyp_va_bits - 2);
+	__hyp_vmemmap = __io_map_base | BIT(hyp_va_bits - 3);
+
+	return __hyp_create_mappings(start, end - start, start, PAGE_HYP_EXEC);
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
index dbe57ae84a0c..cfc6dac0f0ac 100644
--- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c
+++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
@@ -193,8 +193,6 @@ static int psci_cpu_on(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	return ret;
 }
 
-void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
-
 asmlinkage void __noreturn __kvm_hyp_psci_cpu_entry(void)
 {
 	struct kvm_host_psci_state *cpu_state = this_cpu_ptr(&kvm_host_psci_state);
diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c
new file mode 100644
index 000000000000..9679c97b875b
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/setup.c
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_pgtable.h>
+
+#include <nvhe/early_alloc.h>
+#include <nvhe/gfp.h>
+#include <nvhe/memory.h>
+#include <nvhe/mm.h>
+
+struct hyp_pool hpool;
+struct kvm_pgtable_mm_ops hyp_pgtable_mm_ops;
+unsigned long hyp_nr_cpus;
+
+#define hyp_percpu_size ((unsigned long)__per_cpu_end - \
+			 (unsigned long)__per_cpu_start)
+
+static void *stacks_base;
+static void *vmemmap_base;
+static void *hyp_pgt_base;
+
+static int divide_memory_pool(void *virt, unsigned long size)
+{
+	unsigned long vstart, vend, nr_pages;
+
+	hyp_early_alloc_init(virt, size);
+
+	stacks_base = hyp_early_alloc_contig(hyp_nr_cpus);
+	if (!stacks_base)
+		return -ENOMEM;
+
+	hyp_vmemmap_range(__hyp_pa(virt), size, &vstart, &vend);
+	nr_pages = (vend - vstart) >> PAGE_SHIFT;
+	vmemmap_base = hyp_early_alloc_contig(nr_pages);
+	if (!vmemmap_base)
+		return -ENOMEM;
+
+	nr_pages = hyp_s1_pgtable_size() >> PAGE_SHIFT;
+	hyp_pgt_base = hyp_early_alloc_contig(nr_pages);
+	if (!hyp_pgt_base)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int recreate_hyp_mappings(phys_addr_t phys, unsigned long size,
+				 unsigned long *per_cpu_base)
+{
+	void *start, *end, *virt = hyp_phys_to_virt(phys);
+	int ret, i;
+
+	/* Recreate the hyp page-table using the early page allocator */
+	hyp_early_alloc_init(hyp_pgt_base, hyp_s1_pgtable_size());
+	ret = kvm_pgtable_hyp_init(&hyp_pgtable, hyp_va_bits,
+				   &hyp_early_alloc_mm_ops);
+	if (ret)
+		return ret;
+
+	ret = hyp_create_idmap();
+	if (ret)
+		return ret;
+
+	ret = hyp_map_vectors();
+	if (ret)
+		return ret;
+
+	ret = hyp_back_vmemmap(phys, size, hyp_virt_to_phys(vmemmap_base));
+	if (ret)
+		return ret;
+
+	ret = hyp_create_mappings(hyp_symbol_addr(__hyp_text_start),
+				  hyp_symbol_addr(__hyp_text_end),
+				  PAGE_HYP_EXEC);
+	if (ret)
+		return ret;
+
+	ret = hyp_create_mappings(hyp_symbol_addr(__start_rodata),
+				  hyp_symbol_addr(__end_rodata), PAGE_HYP_RO);
+	if (ret)
+		return ret;
+
+	ret = hyp_create_mappings(hyp_symbol_addr(__hyp_data_ro_after_init_start),
+				  hyp_symbol_addr(__hyp_data_ro_after_init_end),
+				  PAGE_HYP_RO);
+	if (ret)
+		return ret;
+
+	ret = hyp_create_mappings(hyp_symbol_addr(__bss_start),
+				  hyp_symbol_addr(__hyp_bss_end), PAGE_HYP);
+	if (ret)
+		return ret;
+
+	ret = hyp_create_mappings(hyp_symbol_addr(__hyp_bss_end),
+				  hyp_symbol_addr(__bss_stop), PAGE_HYP_RO);
+	if (ret)
+		return ret;
+
+	ret = hyp_create_mappings(virt, virt + size - 1, PAGE_HYP);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < hyp_nr_cpus; i++) {
+		start = (void *)kern_hyp_va(per_cpu_base[i]);
+		end = start + PAGE_ALIGN(hyp_percpu_size);
+		ret = hyp_create_mappings(start, end, PAGE_HYP);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static void update_nvhe_init_params(void)
+{
+	struct kvm_nvhe_init_params *params;
+	unsigned long i, stack;
+
+	for (i = 0; i < hyp_nr_cpus; i++) {
+		stack = (unsigned long)stacks_base + (i << PAGE_SHIFT);
+		params = per_cpu_ptr(&kvm_init_params, i);
+		params->stack_hyp_va = stack + PAGE_SIZE;
+		params->pgd_pa = __hyp_pa(hyp_pgtable.pgd);
+		__flush_dcache_area(params, sizeof(*params));
+	}
+}
+
+static void *hyp_zalloc_hyp_page(void *arg)
+{
+	return hyp_alloc_pages(&hpool, HYP_GFP_ZERO, 0);
+}
+
+void __noreturn __kvm_hyp_protect_finalise(void)
+{
+	struct kvm_host_data *host_data = this_cpu_ptr(&kvm_host_data);
+	struct kvm_cpu_context *host_ctxt = &host_data->host_ctxt;
+	unsigned long nr_pages, used_pages;
+	int ret;
+
+	/* Now that the vmemmap is backed, install the full-fledged allocator */
+	nr_pages = hyp_s1_pgtable_size() >> PAGE_SHIFT;
+	used_pages = hyp_early_alloc_nr_pages();
+	ret = hyp_pool_init(&hpool, __hyp_pa(hyp_pgt_base), nr_pages, used_pages);
+	if (ret)
+		goto out;
+
+	hyp_pgtable_mm_ops.zalloc_page = hyp_zalloc_hyp_page;
+	hyp_pgtable_mm_ops.phys_to_virt = hyp_phys_to_virt;
+	hyp_pgtable_mm_ops.virt_to_phys = hyp_virt_to_phys;
+	hyp_pgtable_mm_ops.get_page = hyp_get_page;
+	hyp_pgtable_mm_ops.put_page = hyp_put_page;
+	hyp_pgtable.mm_ops = &hyp_pgtable_mm_ops;
+
+out:
+	host_ctxt->regs.regs[0] = SMCCC_RET_SUCCESS;
+	host_ctxt->regs.regs[1] = ret;
+
+	__host_enter(host_ctxt);
+}
+
+int __kvm_hyp_protect(phys_addr_t phys, unsigned long size,
+		      unsigned long nr_cpus, unsigned long *per_cpu_base)
+{
+	struct kvm_nvhe_init_params *params;
+	void *virt = hyp_phys_to_virt(phys);
+	void (*fn)(phys_addr_t params_pa, void *finalize_fn_va);
+	int ret;
+
+	if (phys % PAGE_SIZE || size % PAGE_SIZE || (u64)virt % PAGE_SIZE)
+		return -EINVAL;
+
+	hyp_spin_lock_init(&__hyp_pgd_lock);
+	hyp_nr_cpus = nr_cpus;
+
+	ret = divide_memory_pool(virt, size);
+	if (ret)
+		return ret;
+
+	ret = recreate_hyp_mappings(phys, size, per_cpu_base);
+	if (ret)
+		return ret;
+
+	update_nvhe_init_params();
+
+	/* Jump in the idmap page to switch to the new page-tables */
+	params = this_cpu_ptr(&kvm_init_params);
+	fn = (typeof(fn))__hyp_pa(hyp_symbol_addr(__kvm_init_switch_pgd));
+	fn(__hyp_pa(params), hyp_symbol_addr(__kvm_hyp_protect_finalise));
+
+	unreachable();
+}
diff --git a/arch/arm64/kvm/hyp/reserved_mem.c b/arch/arm64/kvm/hyp/reserved_mem.c
new file mode 100644
index 000000000000..02b0b18006f5
--- /dev/null
+++ b/arch/arm64/kvm/hyp/reserved_mem.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/memblock.h>
+
+#include <asm/kvm_host.h>
+
+#include <nvhe/memory.h>
+#include <nvhe/mm.h>
+
+phys_addr_t hyp_mem_base;
+phys_addr_t hyp_mem_size;
+
+void __init early_init_dt_add_memory_hyp(u64 base, u64 size)
+{
+	struct hyp_memblock_region *reg;
+
+	if (kvm_nvhe_sym(hyp_memblock_nr) >= HYP_MEMBLOCK_REGIONS)
+		kvm_nvhe_sym(hyp_memblock_nr) = -1;
+
+	if (kvm_nvhe_sym(hyp_memblock_nr) < 0)
+		return;
+
+	reg = kvm_nvhe_sym(hyp_memory);
+	reg[kvm_nvhe_sym(hyp_memblock_nr)].start = base;
+	reg[kvm_nvhe_sym(hyp_memblock_nr)].end = base + size;
+	kvm_nvhe_sym(hyp_memblock_nr)++;
+}
+
+extern bool enable_protected_kvm;
+void __init reserve_kvm_hyp(void)
+{
+	u64 nr_pages, prev;
+
+	if (!enable_protected_kvm)
+		return;
+
+	if (!is_hyp_mode_available() || is_kernel_in_hyp_mode())
+		return;
+
+	if (kvm_nvhe_sym(hyp_memblock_nr) <= 0)
+		return;
+
+	hyp_mem_size += num_possible_cpus() << PAGE_SHIFT;
+	hyp_mem_size += hyp_s1_pgtable_size();
+
+	/*
+	 * The hyp_vmemmap needs to be backed by pages, but these pages
+	 * themselves need to be present in the vmemmap, so compute the number
+	 * of pages needed by looking for a fixed point.
+	 */
+	nr_pages = 0;
+	do {
+		prev = nr_pages;
+		nr_pages = (hyp_mem_size >> PAGE_SHIFT) + prev;
+		nr_pages = DIV_ROUND_UP(nr_pages * sizeof(struct hyp_page), PAGE_SIZE);
+		nr_pages += __hyp_pgtable_max_pages(nr_pages);
+	} while (nr_pages != prev);
+	hyp_mem_size += nr_pages << PAGE_SHIFT;
+
+	hyp_mem_base = memblock_find_in_range(0, memblock_end_of_DRAM(),
+					      hyp_mem_size, SZ_2M);
+	if (!hyp_mem_base) {
+		kvm_err("Failed to reserve hyp memory\n");
+		return;
+	}
+	memblock_reserve(hyp_mem_base, hyp_mem_size);
+
+	kvm_info("Reserved %lld MiB at 0x%llx\n", hyp_mem_size >> 20,
+		 hyp_mem_base);
+}
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 278e163beda4..3cf9397dabdb 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1264,10 +1264,10 @@ static struct kvm_pgtable_mm_ops kvm_hyp_mm_ops = {
 	.virt_to_phys		= kvm_host_pa,
 };
 
+u32 hyp_va_bits;
 int kvm_mmu_init(void)
 {
 	int err;
-	u32 hyp_va_bits;
 
 	hyp_idmap_start = __pa_symbol(__hyp_idmap_text_start);
 	hyp_idmap_start = ALIGN_DOWN(hyp_idmap_start, PAGE_SIZE);
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 095540667f0f..f81da019b677 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -34,6 +34,7 @@
 #include <asm/fixmap.h>
 #include <asm/kasan.h>
 #include <asm/kernel-pgtable.h>
+#include <asm/kvm_host.h>
 #include <asm/memory.h>
 #include <asm/numa.h>
 #include <asm/sections.h>
@@ -390,6 +391,8 @@ void __init arm64_memblock_init(void)
 
 	reserve_elfcorehdr();
 
+	reserve_kvm_hyp();
+
 	high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
 
 	dma_contiguous_reserve(arm64_dma32_phys_limit);
