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This interface is necessary for VMM which creates separated thread for IO handling or uses vhost devices. Signed-off-by: Yingshiuan Pan Signed-off-by: kevenny hsieh Signed-off-by: Liju Chen Signed-off-by: Yi-De Wu --- arch/arm64/geniezone/gzvm_arch_common.h | 18 ++ drivers/virt/geniezone/Makefile | 3 +- drivers/virt/geniezone/gzvm_irqfd.c | 382 ++++++++++++++++++++++++ drivers/virt/geniezone/gzvm_main.c | 12 +- drivers/virt/geniezone/gzvm_vcpu.c | 1 + drivers/virt/geniezone/gzvm_vm.c | 18 ++ include/linux/gzvm_drv.h | 25 ++ include/uapi/linux/gzvm.h | 26 ++ 8 files changed, 483 insertions(+), 2 deletions(-) create mode 100644 drivers/virt/geniezone/gzvm_irqfd.c diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone= /gzvm_arch_common.h index 7b423c1c4549..67c7864c3afc 100644 --- a/arch/arm64/geniezone/gzvm_arch_common.h +++ b/arch/arm64/geniezone/gzvm_arch_common.h @@ -45,6 +45,8 @@ enum { #define MT_HVC_GZVM_ENABLE_CAP GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP) #define MT_HVC_GZVM_INFORM_EXIT GZVM_HCALL_ID(GZVM_FUNC_INFORM_EXIT) =20 +#define GIC_V3_NR_LRS 16 + /** * gzvm_hypcall_wrapper() - the wrapper for hvc calls * @a0: arguments passed in registers 0 @@ -75,6 +77,22 @@ static inline u16 get_vcpuid_from_tuple(unsigned int tup= le) return (u16)(tuple & 0xffff); } =20 +/** + * struct gzvm_vcpu_hwstate: Sync architecture state back to host for hand= ling + * @nr_lrs: The available LRs(list registers) in Soc. + * @__pad: add an explicit '__u32 __pad;' in the middle to make it clear + * what the actual layout is. + * @lr: The array of LRs(list registers). + * + * - Keep the same layout of hypervisor data struct. + * - Sync list registers back for acking virtual device interrupt status. + */ +struct gzvm_vcpu_hwstate { + __le32 nr_lrs; + __le32 __pad; + __le64 lr[GIC_V3_NR_LRS]; +}; + static inline unsigned int assemble_vm_vcpu_tuple(u16 vmid, u16 vcpuid) { diff --git a/drivers/virt/geniezone/Makefile b/drivers/virt/geniezone/Makef= ile index a630b919cda5..cebe5ad53f41 100644 --- a/drivers/virt/geniezone/Makefile +++ b/drivers/virt/geniezone/Makefile @@ -7,4 +7,5 @@ GZVM_DIR ?=3D ../../../drivers/virt/geniezone =20 gzvm-y :=3D $(GZVM_DIR)/gzvm_main.o $(GZVM_DIR)/gzvm_vm.o \ - $(GZVM_DIR)/gzvm_mmu.o $(GZVM_DIR)/gzvm_vcpu.o + $(GZVM_DIR)/gzvm_mmu.o $(GZVM_DIR)/gzvm_vcpu.o \ + $(GZVM_DIR)/gzvm_irqfd.o diff --git a/drivers/virt/geniezone/gzvm_irqfd.c b/drivers/virt/geniezone/g= zvm_irqfd.c new file mode 100644 index 000000000000..fe77d074cf20 --- /dev/null +++ b/drivers/virt/geniezone/gzvm_irqfd.c @@ -0,0 +1,382 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2023 MediaTek Inc. + */ + +#include +#include +#include +#include "gzvm_common.h" + +struct gzvm_irq_ack_notifier { + struct hlist_node link; + unsigned int gsi; + void (*irq_acked)(struct gzvm_irq_ack_notifier *ian); +}; + +/** + * struct gzvm_kernel_irqfd: gzvm kernel irqfd descriptor. + * @gzvm: Pointer to struct gzvm. + * @wait: Wait queue entry. + * @gsi: Used for level IRQ fast-path. + * @eventfd: Used for setup/shutdown. + * @list: struct list_head. + * @pt: struct poll_table_struct. + * @shutdown: struct work_struct. + */ +struct gzvm_kernel_irqfd { + struct gzvm *gzvm; + wait_queue_entry_t wait; + + int gsi; + + struct eventfd_ctx *eventfd; + struct list_head list; + poll_table pt; + struct work_struct shutdown; +}; + +static struct workqueue_struct *irqfd_cleanup_wq; + +/** + * irqfd_set_irq(): irqfd to inject virtual interrupt. + * @gzvm: Pointer to gzvm. + * @irq: This is spi interrupt number (starts from 0 instead of 32). + * @level: irq triggered level. + */ +static void irqfd_set_irq(struct gzvm *gzvm, u32 irq, int level) +{ + if (level) + gzvm_irqchip_inject_irq(gzvm, 0, irq, level); +} + +/** + * irqfd_shutdown() - Race-free decouple logic (ordering is critical). + * @work: Pointer to work_struct. + */ +static void irqfd_shutdown(struct work_struct *work) +{ + struct gzvm_kernel_irqfd *irqfd =3D + container_of(work, struct gzvm_kernel_irqfd, shutdown); + struct gzvm *gzvm =3D irqfd->gzvm; + u64 cnt; + + /* Make sure irqfd has been initialized in assign path. */ + synchronize_srcu(&gzvm->irq_srcu); + + /* + * Synchronize with the wait-queue and unhook ourselves to prevent + * further events. + */ + eventfd_ctx_remove_wait_queue(irqfd->eventfd, &irqfd->wait, &cnt); + + /* + * It is now safe to release the object's resources + */ + eventfd_ctx_put(irqfd->eventfd); + kfree(irqfd); +} + +/** + * irqfd_is_active() - Assumes gzvm->irqfds.lock is held. + * @irqfd: Pointer to gzvm_kernel_irqfd. + * + * Return: + * * true - irqfd is active. + */ +static bool irqfd_is_active(struct gzvm_kernel_irqfd *irqfd) +{ + return list_empty(&irqfd->list) ? false : true; +} + +/** + * irqfd_deactivate() - Mark the irqfd as inactive and schedule it for rem= oval. + * assumes gzvm->irqfds.lock is held. + * @irqfd: Pointer to gzvm_kernel_irqfd. + */ +static void irqfd_deactivate(struct gzvm_kernel_irqfd *irqfd) +{ + if (!irqfd_is_active(irqfd)) + return; + + list_del_init(&irqfd->list); + + queue_work(irqfd_cleanup_wq, &irqfd->shutdown); +} + +/** + * irqfd_wakeup() - Callback of irqfd wait queue, would be woken by writin= g to + * irqfd to do virtual interrupt injection. + * @wait: Pointer to wait_queue_entry_t. + * @mode: Unused. + * @sync: Unused. + * @key: Get flags about Epoll events. + * + * Return: + * * 0 - Success + */ +static int irqfd_wakeup(wait_queue_entry_t *wait, unsigned int mode, int s= ync, + void *key) +{ + struct gzvm_kernel_irqfd *irqfd =3D + container_of(wait, struct gzvm_kernel_irqfd, wait); + __poll_t flags =3D key_to_poll(key); + struct gzvm *gzvm =3D irqfd->gzvm; + + if (flags & EPOLLIN) { + u64 cnt; + + eventfd_ctx_do_read(irqfd->eventfd, &cnt); + /* gzvm's irq injection is not blocked, don't need workq */ + irqfd_set_irq(gzvm, irqfd->gsi, 1); + } + + if (flags & EPOLLHUP) { + /* The eventfd is closing, detach from GZVM */ + unsigned long iflags; + + spin_lock_irqsave(&gzvm->irqfds.lock, iflags); + + /* + * Do more check if someone deactivated the irqfd before + * we could acquire the irqfds.lock. + */ + if (irqfd_is_active(irqfd)) + irqfd_deactivate(irqfd); + + spin_unlock_irqrestore(&gzvm->irqfds.lock, iflags); + } + + return 0; +} + +static void irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *= wqh, + poll_table *pt) +{ + struct gzvm_kernel_irqfd *irqfd =3D + container_of(pt, struct gzvm_kernel_irqfd, pt); + add_wait_queue_priority(wqh, &irqfd->wait); +} + +static int gzvm_irqfd_assign(struct gzvm *gzvm, struct gzvm_irqfd *args) +{ + struct gzvm_kernel_irqfd *irqfd, *tmp; + struct fd f; + struct eventfd_ctx *eventfd =3D NULL; + int ret; + int idx; + + irqfd =3D kzalloc(sizeof(*irqfd), GFP_KERNEL_ACCOUNT); + if (!irqfd) + return -ENOMEM; + + irqfd->gzvm =3D gzvm; + irqfd->gsi =3D args->gsi; + + INIT_LIST_HEAD(&irqfd->list); + INIT_WORK(&irqfd->shutdown, irqfd_shutdown); + + f =3D fdget(args->fd); + if (!f.file) { + ret =3D -EBADF; + goto out; + } + + eventfd =3D eventfd_ctx_fileget(f.file); + if (IS_ERR(eventfd)) { + ret =3D PTR_ERR(eventfd); + goto fail; + } + + irqfd->eventfd =3D eventfd; + + /* + * Install our own custom wake-up handling so we are notified via + * a callback whenever someone signals the underlying eventfd + */ + init_waitqueue_func_entry(&irqfd->wait, irqfd_wakeup); + init_poll_funcptr(&irqfd->pt, irqfd_ptable_queue_proc); + + spin_lock_irq(&gzvm->irqfds.lock); + + ret =3D 0; + list_for_each_entry(tmp, &gzvm->irqfds.items, list) { + if (irqfd->eventfd !=3D tmp->eventfd) + continue; + /* This fd is used for another irq already. */ + pr_err("already used: gsi=3D%d fd=3D%d\n", args->gsi, args->fd); + ret =3D -EBUSY; + spin_unlock_irq(&gzvm->irqfds.lock); + goto fail; + } + + idx =3D srcu_read_lock(&gzvm->irq_srcu); + + list_add_tail(&irqfd->list, &gzvm->irqfds.items); + + spin_unlock_irq(&gzvm->irqfds.lock); + + vfs_poll(f.file, &irqfd->pt); + + srcu_read_unlock(&gzvm->irq_srcu, idx); + + /* + * do not drop the file until the irqfd is fully initialized, otherwise + * we might race against the EPOLLHUP + */ + fdput(f); + return 0; + +fail: + if (eventfd && !IS_ERR(eventfd)) + eventfd_ctx_put(eventfd); + + fdput(f); + +out: + kfree(irqfd); + return ret; +} + +static void gzvm_notify_acked_gsi(struct gzvm *gzvm, int gsi) +{ + struct gzvm_irq_ack_notifier *gian; + + hlist_for_each_entry_srcu(gian, &gzvm->irq_ack_notifier_list, + link, srcu_read_lock_held(&gzvm->irq_srcu)) + if (gian->gsi =3D=3D gsi) + gian->irq_acked(gian); +} + +void gzvm_notify_acked_irq(struct gzvm *gzvm, unsigned int gsi) +{ + int idx; + + idx =3D srcu_read_lock(&gzvm->irq_srcu); + gzvm_notify_acked_gsi(gzvm, gsi); + srcu_read_unlock(&gzvm->irq_srcu, idx); +} + +/** + * gzvm_irqfd_deassign() - Shutdown any irqfd's that match fd+gsi. + * @gzvm: Pointer to gzvm. + * @args: Pointer to gzvm_irqfd. + * + * Return: + * * 0 - Success. + * * Negative value - Failure. + */ +static int gzvm_irqfd_deassign(struct gzvm *gzvm, struct gzvm_irqfd *args) +{ + struct gzvm_kernel_irqfd *irqfd, *tmp; + struct eventfd_ctx *eventfd; + + eventfd =3D eventfd_ctx_fdget(args->fd); + if (IS_ERR(eventfd)) + return PTR_ERR(eventfd); + + spin_lock_irq(&gzvm->irqfds.lock); + + list_for_each_entry_safe(irqfd, tmp, &gzvm->irqfds.items, list) { + if (irqfd->eventfd =3D=3D eventfd && irqfd->gsi =3D=3D args->gsi) + irqfd_deactivate(irqfd); + } + + spin_unlock_irq(&gzvm->irqfds.lock); + eventfd_ctx_put(eventfd); + + /* + * Block until we know all outstanding shutdown jobs have completed + * so that we guarantee there will not be any more interrupts on this + * gsi once this deassign function returns. + */ + flush_workqueue(irqfd_cleanup_wq); + + return 0; +} + +int gzvm_irqfd(struct gzvm *gzvm, struct gzvm_irqfd *args) +{ + for (int i =3D 0; i < ARRAY_SIZE(args->pad); i++) { + if (args->pad[i]) + return -EINVAL; + } + + if (args->flags & + ~(GZVM_IRQFD_FLAG_DEASSIGN | GZVM_IRQFD_FLAG_RESAMPLE)) + return -EINVAL; + + if (args->flags & GZVM_IRQFD_FLAG_DEASSIGN) + return gzvm_irqfd_deassign(gzvm, args); + + return gzvm_irqfd_assign(gzvm, args); +} + +/** + * gzvm_vm_irqfd_init() - Initialize irqfd data structure per VM + * + * @gzvm: Pointer to struct gzvm. + * + * Return: + * * 0 - Success. + * * Negative - Failure. + */ +int gzvm_vm_irqfd_init(struct gzvm *gzvm) +{ + mutex_init(&gzvm->irq_lock); + + spin_lock_init(&gzvm->irqfds.lock); + INIT_LIST_HEAD(&gzvm->irqfds.items); + if (init_srcu_struct(&gzvm->irq_srcu)) + return -EINVAL; + INIT_HLIST_HEAD(&gzvm->irq_ack_notifier_list); + + return 0; +} + +/** + * gzvm_vm_irqfd_release() - This function is called as the gzvm VM fd is = being + * released. Shutdown all irqfds that still remain open. + * @gzvm: Pointer to gzvm. + */ +void gzvm_vm_irqfd_release(struct gzvm *gzvm) +{ + struct gzvm_kernel_irqfd *irqfd, *tmp; + + spin_lock_irq(&gzvm->irqfds.lock); + + list_for_each_entry_safe(irqfd, tmp, &gzvm->irqfds.items, list) + irqfd_deactivate(irqfd); + + spin_unlock_irq(&gzvm->irqfds.lock); + + /* + * Block until we know all outstanding shutdown jobs have completed. + */ + flush_workqueue(irqfd_cleanup_wq); +} + +/** + * gzvm_drv_irqfd_init() - Erase flushing work items when a VM exits. + * + * Return: + * * 0 - Success. + * * Negative - Failure. + * + * Create a host-wide workqueue for issuing deferred shutdown requests + * aggregated from all vm* instances. We need our own isolated + * queue to ease flushing work items when a VM exits. + */ +int gzvm_drv_irqfd_init(void) +{ + irqfd_cleanup_wq =3D alloc_workqueue("gzvm-irqfd-cleanup", 0, 0); + if (!irqfd_cleanup_wq) + return -ENOMEM; + + return 0; +} + +void gzvm_drv_irqfd_exit(void) +{ + destroy_workqueue(irqfd_cleanup_wq); +} diff --git a/drivers/virt/geniezone/gzvm_main.c b/drivers/virt/geniezone/gz= vm_main.c index 30f6c3975026..4e5d1b83df4a 100644 --- a/drivers/virt/geniezone/gzvm_main.c +++ b/drivers/virt/geniezone/gzvm_main.c @@ -97,16 +97,26 @@ static struct miscdevice gzvm_dev =3D { =20 static int gzvm_drv_probe(struct platform_device *pdev) { + int ret; + if (gzvm_arch_probe() !=3D 0) { dev_err(&pdev->dev, "Not found available conduit\n"); return -ENODEV; } =20 - return misc_register(&gzvm_dev); + ret =3D misc_register(&gzvm_dev); + if (ret) + return ret; + + ret =3D gzvm_drv_irqfd_init(); + if (ret) + return ret; + return 0; } =20 static int gzvm_drv_remove(struct platform_device *pdev) { + gzvm_drv_irqfd_exit(); gzvm_destroy_all_vms(); misc_deregister(&gzvm_dev); return 0; diff --git a/drivers/virt/geniezone/gzvm_vcpu.c b/drivers/virt/geniezone/gz= vm_vcpu.c index 39c471d0d257..598f0ed2dbb5 100644 --- a/drivers/virt/geniezone/gzvm_vcpu.c +++ b/drivers/virt/geniezone/gzvm_vcpu.c @@ -228,6 +228,7 @@ int gzvm_vm_ioctl_create_vcpu(struct gzvm *gzvm, u32 cp= uid) ret =3D -ENOMEM; goto free_vcpu; } + vcpu->hwstate =3D (void *)vcpu->run + PAGE_SIZE; vcpu->vcpuid =3D cpuid; vcpu->gzvm =3D gzvm; mutex_init(&vcpu->lock); diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm= _vm.c index 8d6b7aebaf3a..2ab4391ff16a 100644 --- a/drivers/virt/geniezone/gzvm_vm.c +++ b/drivers/virt/geniezone/gzvm_vm.c @@ -213,6 +213,16 @@ static long gzvm_vm_ioctl(struct file *filp, unsigned = int ioctl, ret =3D gzvm_vm_ioctl_create_device(gzvm, argp); break; } + case GZVM_IRQFD: { + struct gzvm_irqfd data; + + if (copy_from_user(&data, argp, sizeof(data))) { + ret =3D -EFAULT; + goto out; + } + ret =3D gzvm_irqfd(gzvm, &data); + break; + } case GZVM_ENABLE_CAP: { struct gzvm_enable_cap cap; =20 @@ -236,6 +246,7 @@ static void gzvm_destroy_vm(struct gzvm *gzvm) =20 mutex_lock(&gzvm->lock); =20 + gzvm_vm_irqfd_release(gzvm); gzvm_destroy_vcpus(gzvm); gzvm_arch_destroy_vm(gzvm->vm_id); =20 @@ -281,6 +292,13 @@ static struct gzvm *gzvm_create_vm(unsigned long vm_ty= pe) gzvm->mm =3D current->mm; mutex_init(&gzvm->lock); =20 + ret =3D gzvm_vm_irqfd_init(gzvm); + if (ret) { + pr_err("Failed to initialize irqfd\n"); + kfree(gzvm); + return ERR_PTR(ret); + } + mutex_lock(&gzvm_list_lock); list_add(&gzvm->vm_list, &gzvm_list); mutex_unlock(&gzvm_list_lock); diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h index da414c6f81d5..0f9196ddacb7 100644 --- a/include/linux/gzvm_drv.h +++ b/include/linux/gzvm_drv.h @@ -10,6 +10,7 @@ #include #include #include +#include =20 /* * For the normal physical address, the highest 12 bits should be zero, so= we @@ -30,6 +31,7 @@ #define ERR_NOT_SUPPORTED (-24) #define ERR_NOT_IMPLEMENTED (-27) #define ERR_FAULT (-40) +#define GZVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1 =20 /* * The following data structures are for data transferring between driver = and @@ -73,6 +75,7 @@ struct gzvm_vcpu { /* lock of vcpu*/ struct mutex lock; struct gzvm_vcpu_run *run; + struct gzvm_vcpu_hwstate *hwstate; }; =20 struct gzvm { @@ -82,8 +85,23 @@ struct gzvm { struct gzvm_memslot memslot[GZVM_MAX_MEM_REGION]; /* lock for list_add*/ struct mutex lock; + + struct { + /* lock for irqfds list operation */ + spinlock_t lock; + struct list_head items; + struct list_head resampler_list; + /* lock for irqfds resampler */ + struct mutex resampler_lock; + } irqfds; + struct list_head vm_list; u16 vm_id; + + struct hlist_head irq_ack_notifier_list; + struct srcu_struct irq_srcu; + /* lock for irq injection */ + struct mutex irq_lock; }; =20 long gzvm_dev_ioctl_check_extension(struct gzvm *gzvm, unsigned long args); @@ -126,4 +144,11 @@ int gzvm_arch_create_device(u16 vm_id, struct gzvm_cre= ate_device *gzvm_dev); int gzvm_arch_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx, u32 irq, bool level); =20 +void gzvm_notify_acked_irq(struct gzvm *gzvm, unsigned int gsi); +int gzvm_irqfd(struct gzvm *gzvm, struct gzvm_irqfd *args); +int gzvm_drv_irqfd_init(void); +void gzvm_drv_irqfd_exit(void); +int gzvm_vm_irqfd_init(struct gzvm *gzvm); +void gzvm_vm_irqfd_release(struct gzvm *gzvm); + #endif /* __GZVM_DRV_H__ */ diff --git a/include/uapi/linux/gzvm.h b/include/uapi/linux/gzvm.h index 2147ef3adf43..bf6611476117 100644 --- a/include/uapi/linux/gzvm.h +++ b/include/uapi/linux/gzvm.h @@ -308,4 +308,30 @@ struct gzvm_one_reg { =20 #define GZVM_REG_GENERIC 0x0000000000000000ULL =20 +#define GZVM_IRQFD_FLAG_DEASSIGN BIT(0) +/* + * GZVM_IRQFD_FLAG_RESAMPLE indicates resamplefd is valid and specifies + * the irqfd to operate in resampling mode for level triggered interrupt + * emulation. + */ +#define GZVM_IRQFD_FLAG_RESAMPLE BIT(1) + +/** + * struct gzvm_irqfd: gzvm irqfd descriptor + * @fd: File descriptor. + * @gsi: Used for level IRQ fast-path. + * @flags: FLAG_DEASSIGN or FLAG_RESAMPLE. + * @resamplefd: The file descriptor of the resampler. + * @pad: Reserved for future-proof. + */ +struct gzvm_irqfd { + __u32 fd; + __u32 gsi; + __u32 flags; + __u32 resamplefd; + __u8 pad[16]; +}; + +#define GZVM_IRQFD _IOW(GZVM_IOC_MAGIC, 0x76, struct gzvm_irqfd) + #endif /* __GZVM_H__ */ --=20 2.18.0