[PATCH v1 24/27] KVM: s390: arm64: Implement vm/vcpu create destroy.

[Steffen Eiden]

Implement init and destroy IOCTLS for vcpu and vm.
Implement arch vm IOCTL. Use s390 gmap.

Co-developed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Co-developed-by: Andreas Grapentin <gra@xxxxxxxxxxxxx>
Signed-off-by: Andreas Grapentin <gra@xxxxxxxxxxxxx>
Co-developed-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx>
Signed-off-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx>
Signed-off-by: Steffen Eiden <seiden@xxxxxxxxxxxxx>
---
 arch/s390/kvm/arm64/arm.c | 160 ++++++++++++++++++++++++++++++++++++++
 arch/s390/kvm/arm64/arm.h |  54 +++++++++++++
 2 files changed, 214 insertions(+)

diff --git a/arch/s390/kvm/arm64/arm.c b/arch/s390/kvm/arm64/arm.c
index 8f94eb8fe288..962d23f4e469 100644
--- a/arch/s390/kvm/arm64/arm.c
+++ b/arch/s390/kvm/arm64/arm.c
@@ -9,6 +9,8 @@
 #include <linux/kvm_host.h>
 
 #include "arm.h"
+#include "reset.h"
+#include "gmap.h"
 
 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 {
@@ -41,6 +43,61 @@ static u64 kvm_max_guest_address(void)
 	return ALIGN_DOWN(max_addr + 1, 1 << 30) - 1;
 }
 
+static int kvm_gmap_init(struct kvm *kvm)
+{
+	struct crst_table *table;
+
+	kvm->arch.gmap = gmap_new(kvm, kvm->arch.guest_phys_size);
+
+	if (!kvm->arch.gmap)
+		return -ENOMEM;
+
+	/* arm64 (on s390) do not have pfault */
+	clear_bit(GMAP_FLAG_PFAULT_ENABLED, &kvm->arch.gmap->flags);
+	set_bit(GMAP_FLAG_ALLOW_HPAGE_1M, &kvm->arch.gmap->flags);
+
+	table = dereference_asce(kvm->arch.gmap->asce);
+	crst_table_init((void *)table, _CRSTE_HOLE(table->crstes[0].h.tt).val);
+
+	return 0;
+}
+
+int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
+{
+	char debug_name[32];
+	int ret;
+
+	if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK)
+		return -EINVAL;
+
+	ret = kvm_vm_type_ipa_size_shift(type);
+	if (ret < 0)
+		return ret;
+	kvm->arch.guest_phys_size = 1UL << ret;
+
+	mutex_init(&kvm->arch.config_lock);
+	bitmap_zero(kvm->arch.vcpu_features, KVM_VCPU_MAX_FEATURES);
+
+	snprintf(debug_name, sizeof(debug_name), "kvm-arm64-%u", current->pid);
+	kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
+	if (!kvm->arch.dbf)
+		return -ENOMEM;
+	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
+
+	ret = kvm_gmap_init(kvm);
+	if (ret)
+		goto out_err;
+	kvm->arch.mem_limit = kvm_max_guest_address();
+
+	VM_EVENT(kvm, 3, "vm created with type %lu", type);
+	return 0;
+
+out_err:
+	debug_unregister(kvm->arch.dbf);
+
+	return ret;
+}
+
 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 {
 	return VM_FAULT_SIGBUS;
@@ -52,6 +109,13 @@ long kvm_arch_dev_ioctl(struct file *filp,
 	return -EINVAL;
 }
 
+void kvm_arch_destroy_vm(struct kvm *kvm)
+{
+	kvm_destroy_vcpus(kvm);
+	debug_unregister(kvm->arch.dbf);
+	kvm->arch.gmap = gmap_put(kvm->arch.gmap);
+}
+
 u32 get_kvm_ipa_limit(void)
 {
 	return fls64(kvm_max_guest_address() + 1) - 1;
@@ -62,10 +126,39 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 	return 0;
 }
 
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
+{
+	struct kvm_sae_block *sae_block = &vcpu->arch.sae_block;
+
+	spin_lock_init(&vcpu->arch.mp_state_lock);
+
+	/* Force users to call KVM_ARM_VCPU_INIT */
+	vcpu_clear_flag(vcpu, VCPU_INITIALIZED);
+
+	vcpu->arch.mc = kvm_s390_new_mmu_cache();
+	if (!vcpu->arch.mc)
+		return -ENOMEM;
+
+	sae_block->hbasce = vcpu->kvm->arch.gmap->asce.val;
+	sae_block->mso = 0L;
+	sae_block->msl = kvm_max_guest_address();
+
+	VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%p, sae block at 0x%p, satellite at 0x%p",
+		 vcpu->vcpu_id, vcpu, &vcpu->arch.sae_block, &vcpu->arch.save_area);
+	return 0;
+}
+
 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 {
 }
 
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+	kvm_s390_free_mmu_cache(vcpu->arch.mc);
+
+	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
+}
+
 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
 {
 }
@@ -103,6 +196,52 @@ int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
 	return 0;
 }
 
+int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
+			       struct kvm_dirty_log *log)
+{
+	return gmap_get_dirty_log(kvm, log);
+}
+
+bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+	scoped_guard(read_lock, &kvm->mmu_lock)
+		return gmap_age_gfn(kvm->arch.gmap, range->start, range->end);
+}
+
+void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
+{
+	gfn_t last_gfn = memslot->base_gfn + memslot->npages;
+
+	scoped_guard(read_lock, &kvm->mmu_lock)
+		gmap_sync_dirty_log(kvm->arch.gmap, memslot->base_gfn, last_gfn);
+}
+
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+				   const struct kvm_memory_slot *old,
+				   struct kvm_memory_slot *new,
+				   enum kvm_mr_change change)
+{
+	return gmap_prepare_memory_region(kvm, old, new, change);
+}
+
+void kvm_arch_commit_memory_region(struct kvm *kvm,
+				   struct kvm_memory_slot *old,
+				   const struct kvm_memory_slot *new,
+				   enum kvm_mr_change change)
+{
+	gmap_commit_memory_region(kvm, old, new, change);
+}
+
+bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+	return gmap_unmap_gfn_range(kvm->arch.gmap, range->slot, range->start, range->end);
+}
+
+bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+	return gmap_test_age_gfn(kvm, range);
+}
+
 void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
 					     struct kvm_memory_slot *slot,
 					     gfn_t gfn_offset,
@@ -110,6 +249,27 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
 {
 }
 
+int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+
+	switch (ioctl) {
+	case KVM_ARM_PREFERRED_TARGET: {
+		struct kvm_vcpu_init init = {
+			.target = KVM_ARM_TARGET_GENERIC_V8,
+		};
+
+		if (copy_to_user(argp, &init, sizeof(init)))
+			return -EFAULT;
+
+		return 0;
+	}
+
+	default:
+		return -EINVAL;
+	}
+}
+
 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)
 {
 	return false;
diff --git a/arch/s390/kvm/arm64/arm.h b/arch/s390/kvm/arm64/arm.h
index a3db254462c0..9571e6e1851a 100644
--- a/arch/s390/kvm/arm64/arm.h
+++ b/arch/s390/kvm/arm64/arm.h
@@ -4,4 +4,58 @@
 
 #define KVM_DEV_NAME "kvm-arm64"
 
+#define VM_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
+do { \
+	debug_sprintf_event((d_kvm)->arch.dbf, d_loglevel, KVM_DEV_NAME ": " d_string "\n", d_args); \
+} while (0)
+
+#define VCPU_EVENT(d_vcpu, d_loglevel, d_string, d_args...)			\
+	do {									\
+		debug_sprintf_event(						\
+			(d_vcpu)->kvm->arch.dbf, d_loglevel,			\
+			"KVM_DEV_NAME %02d[%016llx-%016llx]: " d_string "\n",	\
+			(d_vcpu)->vcpu_id, (d_vcpu)->arch.sae_block.pstate,	\
+			(d_vcpu)->arch.sae_block.pc, d_args);			\
+	} while (0)
+
+static __always_inline bool kvm_s390_is_in_sie(struct kvm_vcpu *vcpu)
+{
+	return false;
+}
+
+static __always_inline int kvm_is_ucontrol(struct kvm *kvm)
+{
+	return 0;
+}
+
+static __always_inline int __kvm_s390_pv_destroy_page(struct page *page)
+{
+	return 0;
+}
+
+static __always_inline void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, gpa_t start, gpa_t end)
+{
+}
+
+static __always_inline int kvm_s390_pv_get_handle(struct kvm *kvm)
+{
+	return 0;
+}
+
+static __always_inline int kvm_s390_is_migration_mode(struct kvm *kvm)
+{
+	return false;
+}
+
+static __always_inline bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
+{
+	return false;
+}
+
+/* should never be called */
+static __always_inline int kvm_s390_vm_stop_migration(struct kvm *kvm)
+{
+	return -EINVAL;
+}
+
 #endif /* ARCH_S390_KVM_ARM64_H */
-- 
2.51.0