Merge branch kvm-arm64/pkvm-cleanups-5.17 into kvmarm-master/next

* kvm-arm64/pkvm-cleanups-5.17:
  : .
  : pKVM cleanups from Quentin Perret:
  :
  : This series is a collection of various fixes and cleanups for KVM/arm64
  : when running in nVHE protected mode. The first two patches are real
  : fixes/improvements, the following two are minor cleanups, and the last
  : two help satisfy my paranoia so they're certainly optional.
  : .
  KVM: arm64: pkvm: Make kvm_host_owns_hyp_mappings() robust to VHE
  KVM: arm64: pkvm: Stub io map functions
  KVM: arm64: Make __io_map_base static
  KVM: arm64: Make the hyp memory pool static
  KVM: arm64: pkvm: Disable GICv2 support
  KVM: arm64: pkvm: Fix hyp_pool max order

Signed-off-by: Marc Zyngier <[email protected]>

Author: Marc Zyngier

arch/arm64/kvm/hyp/include/nvhe/mm.h

@@ -12,8 +12,6 @@
 
 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);

arch/arm64/kvm/hyp/nvhe/mm.c

@@ -19,11 +19,12 @@
 
 struct kvm_pgtable pkvm_pgtable;
 hyp_spinlock_t pkvm_pgd_lock;
-u64 __io_map_base;
 
 struct memblock_region hyp_memory[HYP_MEMBLOCK_REGIONS];
 unsigned int hyp_memblock_nr;
 
+static u64 __io_map_base;
+
 static int __pkvm_create_mappings(unsigned long start, unsigned long size,
 				  unsigned long phys, enum kvm_pgtable_prot prot)
 {

arch/arm64/kvm/hyp/nvhe/page_alloc.c

@@ -241,7 +241,7 @@ int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
 	int i;
 
 	hyp_spin_lock_init(&pool->lock);
-	pool->max_order = min(MAX_ORDER, get_order(nr_pages << PAGE_SHIFT));
+	pool->max_order = min(MAX_ORDER, get_order((nr_pages + 1) << PAGE_SHIFT));
 	for (i = 0; i < pool->max_order; i++)
 		INIT_LIST_HEAD(&pool->free_area[i]);
 	pool->range_start = phys;

arch/arm64/kvm/hyp/nvhe/setup.c

@@ -18,7 +18,6 @@
 #include <nvhe/mm.h>
 #include <nvhe/trap_handler.h>
 
-struct hyp_pool hpool;
 unsigned long hyp_nr_cpus;
 
 #define hyp_percpu_size ((unsigned long)__per_cpu_end - \
@@ -28,6 +27,7 @@ static void *vmemmap_base;
 static void *hyp_pgt_base;
 static void *host_s2_pgt_base;
 static struct kvm_pgtable_mm_ops pkvm_pgtable_mm_ops;
+static struct hyp_pool hpool;
 
 static int divide_memory_pool(void *virt, unsigned long size)
 {

arch/arm64/kvm/mmu.c

@@ -239,6 +239,9 @@ void free_hyp_pgds(void)
 
 static bool kvm_host_owns_hyp_mappings(void)
 {
+	if (is_kernel_in_hyp_mode())
+		return false;
+
 	if (static_branch_likely(&kvm_protected_mode_initialized))
 		return false;
 
@@ -407,6 +410,9 @@ int create_hyp_io_mappings(phys_addr_t phys_addr, size_t size,
 	unsigned long addr;
 	int ret;
 
+	if (is_protected_kvm_enabled())
+		return -EPERM;
+
 	*kaddr = ioremap(phys_addr, size);
 	if (!*kaddr)
 		return -ENOMEM;
@@ -650,6 +656,9 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
 				     KVM_PGTABLE_PROT_R |
 				     (writable ? KVM_PGTABLE_PROT_W : 0);
 
+	if (is_protected_kvm_enabled())
+		return -EPERM;
+
 	size += offset_in_page(guest_ipa);
 	guest_ipa &= PAGE_MASK;
 

arch/arm64/kvm/vgic/vgic-v2.c

@@ -345,6 +345,11 @@ int vgic_v2_probe(const struct gic_kvm_info *info)
 	int ret;
 	u32 vtr;
 
+	if (is_protected_kvm_enabled()) {
+		kvm_err("GICv2 not supported in protected mode\n");
+		return -ENXIO;
+	}
+
 	if (!info->vctrl.start) {
 		kvm_err("GICH not present in the firmware table\n");
 		return -ENXIO;

arch/arm64/kvm/vgic/vgic-v3.c

@@ -651,7 +651,7 @@ int vgic_v3_probe(const struct gic_kvm_info *info)
 	} else if (!PAGE_ALIGNED(info->vcpu.start)) {
 		pr_warn("GICV physical address 0x%llx not page aligned\n",
 			(unsigned long long)info->vcpu.start);
-	} else {
+	} else if (kvm_get_mode() != KVM_MODE_PROTECTED) {
 		kvm_vgic_global_state.vcpu_base = info->vcpu.start;
 		kvm_vgic_global_state.can_emulate_gicv2 = true;
 		ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);