7 files changed, 411 insertions, 53 deletions

diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 6c1f51f25eb3..e4a2f295a394 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -30,8 +30,6 @@
 #include <asm/processor.h>
 #include <asm/thread_info.h>
 
-extern const char __hyp_panic_string[];
-
 extern struct exception_table_entry __start___kvm_ex_table;
 extern struct exception_table_entry __stop___kvm_ex_table;
 
@@ -160,18 +158,10 @@ static inline bool __translate_far_to_hpfar(u64 far, u64 *hpfar)
 	return true;
 }
 
-static inline bool __populate_fault_info(struct kvm_vcpu *vcpu)
+static inline bool __get_fault_info(u64 esr, struct kvm_vcpu_fault_info *fault)
 {
-	u8 ec;
-	u64 esr;
 	u64 hpfar, far;
 
-	esr = vcpu->arch.fault.esr_el2;
-	ec = ESR_ELx_EC(esr);
-
-	if (ec != ESR_ELx_EC_DABT_LOW && ec != ESR_ELx_EC_IABT_LOW)
-		return true;
-
 	far = read_sysreg_el2(SYS_FAR);
 
 	/*
@@ -194,33 +184,59 @@ static inline bool __populate_fault_info(struct kvm_vcpu *vcpu)
 		hpfar = read_sysreg(hpfar_el2);
 	}
 
-	vcpu->arch.fault.far_el2 = far;
-	vcpu->arch.fault.hpfar_el2 = hpfar;
+	fault->far_el2 = far;
+	fault->hpfar_el2 = hpfar;
 	return true;
 }
 
+static inline bool __populate_fault_info(struct kvm_vcpu *vcpu)
+{
+	u8 ec;
+	u64 esr;
+
+	esr = vcpu->arch.fault.esr_el2;
+	ec = ESR_ELx_EC(esr);
+
+	if (ec != ESR_ELx_EC_DABT_LOW && ec != ESR_ELx_EC_IABT_LOW)
+		return true;
+
+	return __get_fault_info(esr, &vcpu->arch.fault);
+}
+
+static inline void __hyp_sve_save_host(struct kvm_vcpu *vcpu)
+{
+	struct thread_struct *thread;
+
+	thread = container_of(vcpu->arch.host_fpsimd_state, struct thread_struct,
+			      uw.fpsimd_state);
+
+	__sve_save_state(sve_pffr(thread), &vcpu->arch.host_fpsimd_state->fpsr);
+}
+
+static inline void __hyp_sve_restore_guest(struct kvm_vcpu *vcpu)
+{
+	sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
+	__sve_restore_state(vcpu_sve_pffr(vcpu),
+			    &vcpu->arch.ctxt.fp_regs.fpsr);
+	write_sysreg_el1(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR);
+}
+
 /* Check for an FPSIMD/SVE trap and handle as appropriate */
 static inline bool __hyp_handle_fpsimd(struct kvm_vcpu *vcpu)
 {
-	bool vhe, sve_guest, sve_host;
+	bool sve_guest, sve_host;
 	u8 esr_ec;
+	u64 reg;
 
 	if (!system_supports_fpsimd())
 		return false;
 
-	/*
-	 * Currently system_supports_sve() currently implies has_vhe(),
-	 * so the check is redundant. However, has_vhe() can be determined
-	 * statically and helps the compiler remove dead code.
-	 */
-	if (has_vhe() && system_supports_sve()) {
+	if (system_supports_sve()) {
 		sve_guest = vcpu_has_sve(vcpu);
 		sve_host = vcpu->arch.flags & KVM_ARM64_HOST_SVE_IN_USE;
-		vhe = true;
 	} else {
 		sve_guest = false;
 		sve_host = false;
-		vhe = has_vhe();
 	}
 
 	esr_ec = kvm_vcpu_trap_get_class(vcpu);
@@ -229,53 +245,38 @@ static inline bool __hyp_handle_fpsimd(struct kvm_vcpu *vcpu)
 		return false;
 
 	/* Don't handle SVE traps for non-SVE vcpus here: */
-	if (!sve_guest)
-		if (esr_ec != ESR_ELx_EC_FP_ASIMD)
-			return false;
+	if (!sve_guest && esr_ec != ESR_ELx_EC_FP_ASIMD)
+		return false;
 
 	/* Valid trap.  Switch the context: */
-
-	if (vhe) {
-		u64 reg = read_sysreg(cpacr_el1) | CPACR_EL1_FPEN;
-
+	if (has_vhe()) {
+		reg = CPACR_EL1_FPEN;
 		if (sve_guest)
 			reg |= CPACR_EL1_ZEN;
 
-		write_sysreg(reg, cpacr_el1);
+		sysreg_clear_set(cpacr_el1, 0, reg);
 	} else {
-		write_sysreg(read_sysreg(cptr_el2) & ~(u64)CPTR_EL2_TFP,
-			     cptr_el2);
-	}
+		reg = CPTR_EL2_TFP;
+		if (sve_guest)
+			reg |= CPTR_EL2_TZ;
 
+		sysreg_clear_set(cptr_el2, reg, 0);
+	}
 	isb();
 
 	if (vcpu->arch.flags & KVM_ARM64_FP_HOST) {
-		/*
-		 * In the SVE case, VHE is assumed: it is enforced by
-		 * Kconfig and kvm_arch_init().
-		 */
-		if (sve_host) {
-			struct thread_struct *thread = container_of(
-				vcpu->arch.host_fpsimd_state,
-				struct thread_struct, uw.fpsimd_state);
-
-			sve_save_state(sve_pffr(thread),
-				       &vcpu->arch.host_fpsimd_state->fpsr);
-		} else {
+		if (sve_host)
+			__hyp_sve_save_host(vcpu);
+		else
 			__fpsimd_save_state(vcpu->arch.host_fpsimd_state);
-		}
 
 		vcpu->arch.flags &= ~KVM_ARM64_FP_HOST;
 	}
 
-	if (sve_guest) {
-		sve_load_state(vcpu_sve_pffr(vcpu),
-			       &vcpu->arch.ctxt.fp_regs.fpsr,
-			       sve_vq_from_vl(vcpu->arch.sve_max_vl) - 1);
-		write_sysreg_s(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR_EL12);
-	} else {
+	if (sve_guest)
+		__hyp_sve_restore_guest(vcpu);
+	else
 		__fpsimd_restore_state(&vcpu->arch.ctxt.fp_regs);
-	}
 
 	/* Skip restoring fpexc32 for AArch64 guests */
 	if (!(read_sysreg(hcr_el2) & HCR_RW))
diff --git a/arch/arm64/kvm/hyp/include/nvhe/early_alloc.h b/arch/arm64/kvm/hyp/include/nvhe/early_alloc.h
new file mode 100644
index 000000000000..dc61aaa56f31
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/early_alloc.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __KVM_HYP_EARLY_ALLOC_H
+#define __KVM_HYP_EARLY_ALLOC_H
+
+#include <asm/kvm_pgtable.h>
+
+void hyp_early_alloc_init(void *virt, unsigned long size);
+unsigned long hyp_early_alloc_nr_used_pages(void);
+void *hyp_early_alloc_page(void *arg);
+void *hyp_early_alloc_contig(unsigned int nr_pages);
+
+extern struct kvm_pgtable_mm_ops hyp_early_alloc_mm_ops;
+
+#endif /* __KVM_HYP_EARLY_ALLOC_H */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/gfp.h b/arch/arm64/kvm/hyp/include/nvhe/gfp.h
new file mode 100644
index 000000000000..18a4494337bd
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/gfp.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __KVM_HYP_GFP_H
+#define __KVM_HYP_GFP_H
+
+#include <linux/list.h>
+
+#include <nvhe/memory.h>
+#include <nvhe/spinlock.h>
+
+#define HYP_NO_ORDER	UINT_MAX
+
+struct hyp_pool {
+	/*
+	 * Spinlock protecting concurrent changes to the memory pool as well as
+	 * the struct hyp_page of the pool's pages until we have a proper atomic
+	 * API at EL2.
+	 */
+	hyp_spinlock_t lock;
+	struct list_head free_area[MAX_ORDER];
+	phys_addr_t range_start;
+	phys_addr_t range_end;
+	unsigned int max_order;
+};
+
+static inline void hyp_page_ref_inc(struct hyp_page *p)
+{
+	struct hyp_pool *pool = hyp_page_to_pool(p);
+
+	hyp_spin_lock(&pool->lock);
+	p->refcount++;
+	hyp_spin_unlock(&pool->lock);
+}
+
+static inline int hyp_page_ref_dec_and_test(struct hyp_page *p)
+{
+	struct hyp_pool *pool = hyp_page_to_pool(p);
+	int ret;
+
+	hyp_spin_lock(&pool->lock);
+	p->refcount--;
+	ret = (p->refcount == 0);
+	hyp_spin_unlock(&pool->lock);
+
+	return ret;
+}
+
+static inline void hyp_set_page_refcounted(struct hyp_page *p)
+{
+	struct hyp_pool *pool = hyp_page_to_pool(p);
+
+	hyp_spin_lock(&pool->lock);
+	if (p->refcount) {
+		hyp_spin_unlock(&pool->lock);
+		BUG();
+	}
+	p->refcount = 1;
+	hyp_spin_unlock(&pool->lock);
+}
+
+/* Allocation */
+void *hyp_alloc_pages(struct hyp_pool *pool, unsigned int order);
+void hyp_get_page(void *addr);
+void hyp_put_page(void *addr);
+
+/* Used pages cannot be freed */
+int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
+		  unsigned int reserved_pages);
+#endif /* __KVM_HYP_GFP_H */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
new file mode 100644
index 000000000000..42d81ec739fa
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#ifndef __KVM_NVHE_MEM_PROTECT__
+#define __KVM_NVHE_MEM_PROTECT__
+#include <linux/kvm_host.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_pgtable.h>
+#include <asm/virt.h>
+#include <nvhe/spinlock.h>
+
+struct host_kvm {
+	struct kvm_arch arch;
+	struct kvm_pgtable pgt;
+	struct kvm_pgtable_mm_ops mm_ops;
+	hyp_spinlock_t lock;
+};
+extern struct host_kvm host_kvm;
+
+int __pkvm_prot_finalize(void);
+int __pkvm_mark_hyp(phys_addr_t start, phys_addr_t end);
+
+int kvm_host_prepare_stage2(void *mem_pgt_pool, void *dev_pgt_pool);
+void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt);
+
+static __always_inline void __load_host_stage2(void)
+{
+	if (static_branch_likely(&kvm_protected_mode_initialized))
+		__load_stage2(&host_kvm.arch.mmu, host_kvm.arch.vtcr);
+	else
+		write_sysreg(0, vttbr_el2);
+}
+#endif /* __KVM_NVHE_MEM_PROTECT__ */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/memory.h b/arch/arm64/kvm/hyp/include/nvhe/memory.h
new file mode 100644
index 000000000000..fd78bde939ee
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/memory.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __KVM_HYP_MEMORY_H
+#define __KVM_HYP_MEMORY_H
+
+#include <asm/kvm_mmu.h>
+#include <asm/page.h>
+
+#include <linux/types.h>
+
+struct hyp_pool;
+struct hyp_page {
+	unsigned int refcount;
+	unsigned int order;
+	struct hyp_pool *pool;
+	struct list_head node;
+};
+
+extern u64 __hyp_vmemmap;
+#define hyp_vmemmap ((struct hyp_page *)__hyp_vmemmap)
+
+#define __hyp_va(phys)	((void *)((phys_addr_t)(phys) - hyp_physvirt_offset))
+
+static inline void *hyp_phys_to_virt(phys_addr_t phys)
+{
+	return __hyp_va(phys);
+}
+
+static inline phys_addr_t hyp_virt_to_phys(void *addr)
+{
+	return __hyp_pa(addr);
+}
+
+#define hyp_phys_to_pfn(phys)	((phys) >> PAGE_SHIFT)
+#define hyp_pfn_to_phys(pfn)	((phys_addr_t)((pfn) << PAGE_SHIFT))
+#define hyp_phys_to_page(phys)	(&hyp_vmemmap[hyp_phys_to_pfn(phys)])
+#define hyp_virt_to_page(virt)	hyp_phys_to_page(__hyp_pa(virt))
+#define hyp_virt_to_pfn(virt)	hyp_phys_to_pfn(__hyp_pa(virt))
+
+#define hyp_page_to_pfn(page)	((struct hyp_page *)(page) - hyp_vmemmap)
+#define hyp_page_to_phys(page)  hyp_pfn_to_phys((hyp_page_to_pfn(page)))
+#define hyp_page_to_virt(page)	__hyp_va(hyp_page_to_phys(page))
+#define hyp_page_to_pool(page)	(((struct hyp_page *)page)->pool)
+
+static inline int hyp_page_count(void *addr)
+{
+	struct hyp_page *p = hyp_virt_to_page(addr);
+
+	return p->refcount;
+}
+
+#endif /* __KVM_HYP_MEMORY_H */
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..0095f6289742
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h
@@ -0,0 +1,96 @@
+/* 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/memblock.h>
+#include <linux/types.h>
+
+#include <nvhe/memory.h>
+#include <nvhe/spinlock.h>
+
+#define HYP_MEMBLOCK_REGIONS 128
+extern struct memblock_region kvm_nvhe_sym(hyp_memory)[];
+extern unsigned int kvm_nvhe_sym(hyp_memblock_nr);
+extern struct kvm_pgtable pkvm_pgtable;
+extern hyp_spinlock_t pkvm_pgd_lock;
+extern struct hyp_pool hpool;
+extern u64 __io_map_base;
+
+int hyp_create_idmap(u32 hyp_va_bits);
+int hyp_map_vectors(void);
+int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back);
+int pkvm_cpu_set_vector(enum arm64_hyp_spectre_vector slot);
+int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot);
+int __pkvm_create_mappings(unsigned long start, unsigned long size,
+			   unsigned long phys, enum kvm_pgtable_prot prot);
+unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
+					    enum kvm_pgtable_prot 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 */
+	for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
+		nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
+		total += nr_pages;
+	}
+
+	return total;
+}
+
+static inline unsigned long __hyp_pgtable_total_pages(void)
+{
+	unsigned long res = 0, i;
+
+	/* Cover all of memory with page-granularity */
+	for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
+		struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
+		res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
+	}
+
+	return res;
+}
+
+static inline unsigned long hyp_s1_pgtable_pages(void)
+{
+	unsigned long res;
+
+	res = __hyp_pgtable_total_pages();
+
+	/* Allow 1 GiB for private mappings */
+	res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
+
+	return res;
+}
+
+static inline unsigned long host_s2_mem_pgtable_pages(void)
+{
+	/*
+	 * Include an extra 16 pages to safely upper-bound the worst case of
+	 * concatenated pgds.
+	 */
+	return __hyp_pgtable_total_pages() + 16;
+}
+
+static inline unsigned long host_s2_dev_pgtable_pages(void)
+{
+	/* Allow 1 GiB for MMIO mappings */
+	return __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
+}
+
+#endif /* __KVM_HYP_MM_H */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/spinlock.h b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h
new file mode 100644
index 000000000000..76b537f8d1c6
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * A stand-alone ticket spinlock implementation for use by the non-VHE
+ * KVM hypervisor code running at EL2.
+ *
+ * Copyright (C) 2020 Google LLC
+ * Author: Will Deacon <will@kernel.org>
+ *
+ * Heavily based on the implementation removed by c11090474d70 which was:
+ * Copyright (C) 2012 ARM Ltd.
+ */
+
+#ifndef __ARM64_KVM_NVHE_SPINLOCK_H__
+#define __ARM64_KVM_NVHE_SPINLOCK_H__
+
+#include <asm/alternative.h>
+#include <asm/lse.h>
+
+typedef union hyp_spinlock {
+	u32	__val;
+	struct {
+#ifdef __AARCH64EB__
+		u16 next, owner;
+#else
+		u16 owner, next;
+#endif
+	};
+} hyp_spinlock_t;
+
+#define hyp_spin_lock_init(l)						\
+do {									\
+	*(l) = (hyp_spinlock_t){ .__val = 0 };				\
+} while (0)
+
+static inline void hyp_spin_lock(hyp_spinlock_t *lock)
+{
+	u32 tmp;
+	hyp_spinlock_t lockval, newval;
+
+	asm volatile(
+	/* Atomically increment the next ticket. */
+	ARM64_LSE_ATOMIC_INSN(
+	/* LL/SC */
+"	prfm	pstl1strm, %3\n"
+"1:	ldaxr	%w0, %3\n"
+"	add	%w1, %w0, #(1 << 16)\n"
+"	stxr	%w2, %w1, %3\n"
+"	cbnz	%w2, 1b\n",
+	/* LSE atomics */
+"	mov	%w2, #(1 << 16)\n"
+"	ldadda	%w2, %w0, %3\n"
+	__nops(3))
+
+	/* Did we get the lock? */
+"	eor	%w1, %w0, %w0, ror #16\n"
+"	cbz	%w1, 3f\n"
+	/*
+	 * No: spin on the owner. Send a local event to avoid missing an
+	 * unlock before the exclusive load.
+	 */
+"	sevl\n"
+"2:	wfe\n"
+"	ldaxrh	%w2, %4\n"
+"	eor	%w1, %w2, %w0, lsr #16\n"
+"	cbnz	%w1, 2b\n"
+	/* We got the lock. Critical section starts here. */
+"3:"
+	: "=&r" (lockval), "=&r" (newval), "=&r" (tmp), "+Q" (*lock)
+	: "Q" (lock->owner)
+	: "memory");
+}
+
+static inline void hyp_spin_unlock(hyp_spinlock_t *lock)
+{
+	u64 tmp;
+
+	asm volatile(
+	ARM64_LSE_ATOMIC_INSN(
+	/* LL/SC */
+	"	ldrh	%w1, %0\n"
+	"	add	%w1, %w1, #1\n"
+	"	stlrh	%w1, %0",
+	/* LSE atomics */
+	"	mov	%w1, #1\n"
+	"	staddlh	%w1, %0\n"
+	__nops(1))
+	: "=Q" (lock->owner), "=&r" (tmp)
+	:
+	: "memory");
+}
+
+#endif /* __ARM64_KVM_NVHE_SPINLOCK_H__ */