mirror of https://gitee.com/openkylin/linux.git
virt: acrn: Introduce I/O request management
An I/O request of a User VM, which is constructed by the hypervisor, is distributed by the ACRN Hypervisor Service Module to an I/O client corresponding to the address range of the I/O request. For each User VM, there is a shared 4-KByte memory region used for I/O requests communication between the hypervisor and Service VM. An I/O request is a 256-byte structure buffer, which is 'struct acrn_io_request', that is filled by an I/O handler of the hypervisor when a trapped I/O access happens in a User VM. ACRN userspace in the Service VM first allocates a 4-KByte page and passes the GPA (Guest Physical Address) of the buffer to the hypervisor. The buffer is used as an array of 16 I/O request slots with each I/O request slot being 256 bytes. This array is indexed by vCPU ID. An I/O client, which is 'struct acrn_ioreq_client', is responsible for handling User VM I/O requests whose accessed GPA falls in a certain range. Multiple I/O clients can be associated with each User VM. There is a special client associated with each User VM, called the default client, that handles all I/O requests that do not fit into the range of any other I/O clients. The ACRN userspace acts as the default client for each User VM. The state transitions of a ACRN I/O request are as follows. FREE -> PENDING -> PROCESSING -> COMPLETE -> FREE -> ... FREE: this I/O request slot is empty PENDING: a valid I/O request is pending in this slot PROCESSING: the I/O request is being processed COMPLETE: the I/O request has been processed An I/O request in COMPLETE or FREE state is owned by the hypervisor. HSM and ACRN userspace are in charge of processing the others. The processing flow of I/O requests are listed as following: a) The I/O handler of the hypervisor will fill an I/O request with PENDING state when a trapped I/O access happens in a User VM. b) The hypervisor makes an upcall, which is a notification interrupt, to the Service VM. c) The upcall handler schedules a worker to dispatch I/O requests. d) The worker looks for the PENDING I/O requests, assigns them to different registered clients based on the address of the I/O accesses, updates their state to PROCESSING, and notifies the corresponding client to handle. e) The notified client handles the assigned I/O requests. f) The HSM updates I/O requests states to COMPLETE and notifies the hypervisor of the completion via hypercalls. Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Zhi Wang <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Acked-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-10-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuo Liu
Greg Kroah-Hartman
parent
88f537d5e8
commit
72f293de3f
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@ -1,3 +1,3 @@
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# SPDX-License-Identifier: GPL-2.0
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obj-$(CONFIG_ACRN_HSM) := acrn.o
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acrn-y := hsm.o vm.o mm.o
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acrn-y := hsm.o vm.o mm.o ioreq.o
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@ -12,10 +12,15 @@
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extern struct miscdevice acrn_dev;
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#define ACRN_NAME_LEN 16
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#define ACRN_MEM_MAPPING_MAX 256
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#define ACRN_MEM_REGION_ADD 0
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#define ACRN_MEM_REGION_DEL 2
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struct acrn_vm;
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struct acrn_ioreq_client;
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/**
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* struct vm_memory_region_op - Hypervisor memory operation
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* @type: Operation type (ACRN_MEM_REGION_*)
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@ -75,9 +80,63 @@ struct vm_memory_mapping {
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size_t size;
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};
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/**
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* struct acrn_ioreq_buffer - Data for setting the ioreq buffer of User VM
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* @ioreq_buf: The GPA of the IO request shared buffer of a VM
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*
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* The parameter for the HC_SET_IOREQ_BUFFER hypercall used to set up
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* the shared I/O request buffer between Service VM and ACRN hypervisor.
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*/
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struct acrn_ioreq_buffer {
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u64 ioreq_buf;
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};
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struct acrn_ioreq_range {
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struct list_head list;
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u32 type;
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u64 start;
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u64 end;
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};
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#define ACRN_IOREQ_CLIENT_DESTROYING 0U
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typedef int (*ioreq_handler_t)(struct acrn_ioreq_client *client,
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struct acrn_io_request *req);
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/**
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* struct acrn_ioreq_client - Structure of I/O client.
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* @name: Client name
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* @vm: The VM that the client belongs to
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* @list: List node for this acrn_ioreq_client
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* @is_default: If this client is the default one
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* @flags: Flags (ACRN_IOREQ_CLIENT_*)
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* @range_list: I/O ranges
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* @range_lock: Lock to protect range_list
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* @ioreqs_map: The pending I/O requests bitmap.
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* @handler: I/O requests handler of this client
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* @thread: The thread which executes the handler
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* @wq: The wait queue for the handler thread parking
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* @priv: Data for the thread
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*/
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struct acrn_ioreq_client {
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char name[ACRN_NAME_LEN];
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struct acrn_vm *vm;
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struct list_head list;
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bool is_default;
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unsigned long flags;
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struct list_head range_list;
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rwlock_t range_lock;
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DECLARE_BITMAP(ioreqs_map, ACRN_IO_REQUEST_MAX);
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ioreq_handler_t handler;
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struct task_struct *thread;
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wait_queue_head_t wq;
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void *priv;
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};
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#define ACRN_INVALID_VMID (0xffffU)
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#define ACRN_VM_FLAG_DESTROYED 0U
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#define ACRN_VM_FLAG_CLEARING_IOREQ 1U
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extern struct list_head acrn_vm_list;
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extern rwlock_t acrn_vm_list_lock;
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/**
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* struct acrn_vm - Properties of ACRN User VM.
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* @list: Entry within global list of all VMs.
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@ -90,6 +149,11 @@ struct vm_memory_mapping {
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* &acrn_vm.regions_mapping_count.
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* @regions_mapping: Memory mappings of this VM.
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* @regions_mapping_count: Number of memory mapping of this VM.
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* @ioreq_clients_lock: Lock to protect ioreq_clients and default_client
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* @ioreq_clients: The I/O request clients list of this VM
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* @default_client: The default I/O request client
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* @ioreq_buf: I/O request shared buffer
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* @ioreq_page: The page of the I/O request shared buffer
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*/
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struct acrn_vm {
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struct list_head list;
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@ -99,6 +163,11 @@ struct acrn_vm {
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struct mutex regions_mapping_lock;
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struct vm_memory_mapping regions_mapping[ACRN_MEM_MAPPING_MAX];
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int regions_mapping_count;
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spinlock_t ioreq_clients_lock;
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struct list_head ioreq_clients;
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struct acrn_ioreq_client *default_client;
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struct acrn_io_request_buffer *ioreq_buf;
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struct page *ioreq_page;
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};
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struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
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@ -112,4 +181,17 @@ int acrn_vm_memseg_unmap(struct acrn_vm *vm, struct acrn_vm_memmap *memmap);
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int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap);
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void acrn_vm_all_ram_unmap(struct acrn_vm *vm);
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int acrn_ioreq_init(struct acrn_vm *vm, u64 buf_vma);
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void acrn_ioreq_deinit(struct acrn_vm *vm);
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int acrn_ioreq_intr_setup(void);
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void acrn_ioreq_intr_remove(void);
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void acrn_ioreq_request_clear(struct acrn_vm *vm);
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int acrn_ioreq_client_wait(struct acrn_ioreq_client *client);
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int acrn_ioreq_request_default_complete(struct acrn_vm *vm, u16 vcpu);
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struct acrn_ioreq_client *acrn_ioreq_client_create(struct acrn_vm *vm,
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ioreq_handler_t handler,
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void *data, bool is_default,
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const char *name);
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void acrn_ioreq_client_destroy(struct acrn_ioreq_client *client);
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#endif /* __ACRN_HSM_DRV_H */
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@ -48,6 +48,7 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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struct acrn_vm *vm = filp->private_data;
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struct acrn_vm_creation *vm_param;
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struct acrn_vcpu_regs *cpu_regs;
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struct acrn_ioreq_notify notify;
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struct acrn_vm_memmap memmap;
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int i, ret = 0;
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@ -147,6 +148,35 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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ret = acrn_vm_memseg_unmap(vm, &memmap);
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break;
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case ACRN_IOCTL_CREATE_IOREQ_CLIENT:
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if (vm->default_client)
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return -EEXIST;
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if (!acrn_ioreq_client_create(vm, NULL, NULL, true, "acrndm"))
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ret = -EINVAL;
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break;
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case ACRN_IOCTL_DESTROY_IOREQ_CLIENT:
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if (vm->default_client)
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acrn_ioreq_client_destroy(vm->default_client);
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break;
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case ACRN_IOCTL_ATTACH_IOREQ_CLIENT:
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if (vm->default_client)
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ret = acrn_ioreq_client_wait(vm->default_client);
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else
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ret = -ENODEV;
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break;
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case ACRN_IOCTL_NOTIFY_REQUEST_FINISH:
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if (copy_from_user(¬ify, (void __user *)ioctl_param,
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sizeof(struct acrn_ioreq_notify)))
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return -EFAULT;
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if (notify.reserved != 0)
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return -EINVAL;
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ret = acrn_ioreq_request_default_complete(vm, notify.vcpu);
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break;
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case ACRN_IOCTL_CLEAR_VM_IOREQ:
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acrn_ioreq_request_clear(vm);
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break;
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default:
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dev_dbg(acrn_dev.this_device, "Unknown IOCTL 0x%x!\n", cmd);
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ret = -ENOTTY;
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@ -188,14 +218,23 @@ static int __init hsm_init(void)
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return -EPERM;
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ret = misc_register(&acrn_dev);
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if (ret)
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if (ret) {
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pr_err("Create misc dev failed!\n");
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return ret;
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}
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return ret;
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ret = acrn_ioreq_intr_setup();
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if (ret) {
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pr_err("Setup I/O request handler failed!\n");
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misc_deregister(&acrn_dev);
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return ret;
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}
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return 0;
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}
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static void __exit hsm_exit(void)
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{
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acrn_ioreq_intr_remove();
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misc_deregister(&acrn_dev);
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}
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module_init(hsm_init);
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@ -21,6 +21,10 @@
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#define HC_RESET_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x05)
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#define HC_SET_VCPU_REGS _HC_ID(HC_ID, HC_ID_VM_BASE + 0x06)
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#define HC_ID_IOREQ_BASE 0x30UL
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#define HC_SET_IOREQ_BUFFER _HC_ID(HC_ID, HC_ID_IOREQ_BASE + 0x00)
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#define HC_NOTIFY_REQUEST_FINISH _HC_ID(HC_ID, HC_ID_IOREQ_BASE + 0x01)
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#define HC_ID_MEM_BASE 0x40UL
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#define HC_VM_SET_MEMORY_REGIONS _HC_ID(HC_ID, HC_ID_MEM_BASE + 0x02)
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@ -91,6 +95,30 @@ static inline long hcall_set_vcpu_regs(u64 vmid, u64 regs_state)
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return acrn_hypercall2(HC_SET_VCPU_REGS, vmid, regs_state);
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}
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/**
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* hcall_set_ioreq_buffer() - Set up the shared buffer for I/O Requests.
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* @vmid: User VM ID
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* @buffer: Service VM GPA of the shared buffer
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_set_ioreq_buffer(u64 vmid, u64 buffer)
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{
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return acrn_hypercall2(HC_SET_IOREQ_BUFFER, vmid, buffer);
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}
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/**
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* hcall_notify_req_finish() - Notify ACRN Hypervisor of I/O request completion.
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* @vmid: User VM ID
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* @vcpu: The vCPU which initiated the I/O request
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_notify_req_finish(u64 vmid, u64 vcpu)
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{
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return acrn_hypercall2(HC_NOTIFY_REQUEST_FINISH, vmid, vcpu);
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}
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/**
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* hcall_set_memory_regions() - Inform the hypervisor to set up EPT mappings
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* @regions_pa: Service VM GPA of &struct vm_memory_region_batch
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@ -0,0 +1,521 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ACRN_HSM: Handle I/O requests
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*
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* Copyright (C) 2020 Intel Corporation. All rights reserved.
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*
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* Authors:
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* Jason Chen CJ <jason.cj.chen@intel.com>
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* Fengwei Yin <fengwei.yin@intel.com>
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kthread.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <asm/acrn.h>
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#include "acrn_drv.h"
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static void ioreq_pause(void);
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static void ioreq_resume(void);
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static void ioreq_dispatcher(struct work_struct *work);
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static struct workqueue_struct *ioreq_wq;
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static DECLARE_WORK(ioreq_work, ioreq_dispatcher);
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static inline bool has_pending_request(struct acrn_ioreq_client *client)
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{
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return !bitmap_empty(client->ioreqs_map, ACRN_IO_REQUEST_MAX);
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}
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static inline bool is_destroying(struct acrn_ioreq_client *client)
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{
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return test_bit(ACRN_IOREQ_CLIENT_DESTROYING, &client->flags);
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}
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static int ioreq_complete_request(struct acrn_vm *vm, u16 vcpu,
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struct acrn_io_request *acrn_req)
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{
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bool polling_mode;
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int ret = 0;
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polling_mode = acrn_req->completion_polling;
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/* Add barrier() to make sure the writes are done before completion */
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smp_store_release(&acrn_req->processed, ACRN_IOREQ_STATE_COMPLETE);
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/*
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* To fulfill the requirement of real-time in several industry
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* scenarios, like automotive, ACRN can run under the partition mode,
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* in which User VMs and Service VM are bound to dedicated CPU cores.
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* Polling mode of handling the I/O request is introduced to achieve a
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* faster I/O request handling. In polling mode, the hypervisor polls
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* I/O request's completion. Once an I/O request is marked as
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* ACRN_IOREQ_STATE_COMPLETE, hypervisor resumes from the polling point
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* to continue the I/O request flow. Thus, the completion notification
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* from HSM of I/O request is not needed. Please note,
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* completion_polling needs to be read before the I/O request being
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* marked as ACRN_IOREQ_STATE_COMPLETE to avoid racing with the
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* hypervisor.
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*/
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if (!polling_mode) {
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ret = hcall_notify_req_finish(vm->vmid, vcpu);
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if (ret < 0)
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dev_err(acrn_dev.this_device,
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"Notify I/O request finished failed!\n");
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}
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return ret;
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}
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static int acrn_ioreq_complete_request(struct acrn_ioreq_client *client,
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u16 vcpu,
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struct acrn_io_request *acrn_req)
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{
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int ret;
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if (vcpu >= client->vm->vcpu_num)
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return -EINVAL;
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clear_bit(vcpu, client->ioreqs_map);
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if (!acrn_req) {
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acrn_req = (struct acrn_io_request *)client->vm->ioreq_buf;
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acrn_req += vcpu;
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}
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ret = ioreq_complete_request(client->vm, vcpu, acrn_req);
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return ret;
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}
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int acrn_ioreq_request_default_complete(struct acrn_vm *vm, u16 vcpu)
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{
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int ret = 0;
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spin_lock_bh(&vm->ioreq_clients_lock);
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if (vm->default_client)
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ret = acrn_ioreq_complete_request(vm->default_client,
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vcpu, NULL);
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spin_unlock_bh(&vm->ioreq_clients_lock);
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return ret;
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}
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/*
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* ioreq_task() is the execution entity of handler thread of an I/O client.
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* The handler callback of the I/O client is called within the handler thread.
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*/
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static int ioreq_task(void *data)
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{
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struct acrn_ioreq_client *client = data;
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struct acrn_io_request *req;
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unsigned long *ioreqs_map;
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int vcpu, ret;
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/*
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* Lockless access to ioreqs_map is safe, because
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* 1) set_bit() and clear_bit() are atomic operations.
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* 2) I/O requests arrives serialized. The access flow of ioreqs_map is:
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* set_bit() - in ioreq_work handler
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* Handler callback handles corresponding I/O request
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* clear_bit() - in handler thread (include ACRN userspace)
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* Mark corresponding I/O request completed
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* Loop again if a new I/O request occurs
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*/
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ioreqs_map = client->ioreqs_map;
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while (!kthread_should_stop()) {
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acrn_ioreq_client_wait(client);
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while (has_pending_request(client)) {
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vcpu = find_first_bit(ioreqs_map, client->vm->vcpu_num);
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req = client->vm->ioreq_buf->req_slot + vcpu;
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ret = client->handler(client, req);
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if (ret < 0) {
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dev_err(acrn_dev.this_device,
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"IO handle failure: %d\n", ret);
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break;
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}
|
||||
acrn_ioreq_complete_request(client, vcpu, req);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* For the non-default I/O clients, give them chance to complete the current
|
||||
* I/O requests if there are any. For the default I/O client, it is safe to
|
||||
* clear all pending I/O requests because the clearing request is from ACRN
|
||||
* userspace.
|
||||
*/
|
||||
void acrn_ioreq_request_clear(struct acrn_vm *vm)
|
||||
{
|
||||
struct acrn_ioreq_client *client;
|
||||
bool has_pending = false;
|
||||
unsigned long vcpu;
|
||||
int retry = 10;
|
||||
|
||||
/*
|
||||
* IO requests of this VM will be completed directly in
|
||||
* acrn_ioreq_dispatch if ACRN_VM_FLAG_CLEARING_IOREQ flag is set.
|
||||
*/
|
||||
set_bit(ACRN_VM_FLAG_CLEARING_IOREQ, &vm->flags);
|
||||
|
||||
/*
|
||||
* acrn_ioreq_request_clear is only called in VM reset case. Simply
|
||||
* wait 100ms in total for the IO requests' completion.
|
||||
*/
|
||||
do {
|
||||
spin_lock_bh(&vm->ioreq_clients_lock);
|
||||
list_for_each_entry(client, &vm->ioreq_clients, list) {
|
||||
has_pending = has_pending_request(client);
|
||||
if (has_pending)
|
||||
break;
|
||||
}
|
||||
spin_unlock_bh(&vm->ioreq_clients_lock);
|
||||
|
||||
if (has_pending)
|
||||
schedule_timeout_interruptible(HZ / 100);
|
||||
} while (has_pending && --retry > 0);
|
||||
if (retry == 0)
|
||||
dev_warn(acrn_dev.this_device,
|
||||
"%s cannot flush pending request!\n", client->name);
|
||||
|
||||
/* Clear all ioreqs belonging to the default client */
|
||||
spin_lock_bh(&vm->ioreq_clients_lock);
|
||||
client = vm->default_client;
|
||||
if (client) {
|
||||
vcpu = find_next_bit(client->ioreqs_map,
|
||||
ACRN_IO_REQUEST_MAX, 0);
|
||||
while (vcpu < ACRN_IO_REQUEST_MAX) {
|
||||
acrn_ioreq_complete_request(client, vcpu, NULL);
|
||||
vcpu = find_next_bit(client->ioreqs_map,
|
||||
ACRN_IO_REQUEST_MAX, vcpu + 1);
|
||||
}
|
||||
}
|
||||
spin_unlock_bh(&vm->ioreq_clients_lock);
|
||||
|
||||
/* Clear ACRN_VM_FLAG_CLEARING_IOREQ flag after the clearing */
|
||||
clear_bit(ACRN_VM_FLAG_CLEARING_IOREQ, &vm->flags);
|
||||
}
|
||||
|
||||
int acrn_ioreq_client_wait(struct acrn_ioreq_client *client)
|
||||
{
|
||||
if (client->is_default) {
|
||||
/*
|
||||
* In the default client, a user space thread waits on the
|
||||
* waitqueue. The is_destroying() check is used to notify user
|
||||
* space the client is going to be destroyed.
|
||||
*/
|
||||
wait_event_interruptible(client->wq,
|
||||
has_pending_request(client) ||
|
||||
is_destroying(client));
|
||||
if (is_destroying(client))
|
||||
return -ENODEV;
|
||||
} else {
|
||||
wait_event_interruptible(client->wq,
|
||||
has_pending_request(client) ||
|
||||
kthread_should_stop());
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool in_range(struct acrn_ioreq_range *range,
|
||||
struct acrn_io_request *req)
|
||||
{
|
||||
bool ret = false;
|
||||
|
||||
if (range->type == req->type) {
|
||||
switch (req->type) {
|
||||
case ACRN_IOREQ_TYPE_MMIO:
|
||||
if (req->reqs.mmio_request.address >= range->start &&
|
||||
(req->reqs.mmio_request.address +
|
||||
req->reqs.mmio_request.size - 1) <= range->end)
|
||||
ret = true;
|
||||
break;
|
||||
case ACRN_IOREQ_TYPE_PORTIO:
|
||||
if (req->reqs.pio_request.address >= range->start &&
|
||||
(req->reqs.pio_request.address +
|
||||
req->reqs.pio_request.size - 1) <= range->end)
|
||||
ret = true;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct acrn_ioreq_client *find_ioreq_client(struct acrn_vm *vm,
|
||||
struct acrn_io_request *req)
|
||||
{
|
||||
struct acrn_ioreq_client *client, *found = NULL;
|
||||
struct acrn_ioreq_range *range;
|
||||
|
||||
lockdep_assert_held(&vm->ioreq_clients_lock);
|
||||
|
||||
list_for_each_entry(client, &vm->ioreq_clients, list) {
|
||||
read_lock_bh(&client->range_lock);
|
||||
list_for_each_entry(range, &client->range_list, list) {
|
||||
if (in_range(range, req)) {
|
||||
found = client;
|
||||
break;
|
||||
}
|
||||
}
|
||||
read_unlock_bh(&client->range_lock);
|
||||
if (found)
|
||||
break;
|
||||
}
|
||||
return found ? found : vm->default_client;
|
||||
}
|
||||
|
||||
/**
|
||||
* acrn_ioreq_client_create() - Create an ioreq client
|
||||
* @vm: The VM that this client belongs to
|
||||
* @handler: The ioreq_handler of ioreq client acrn_hsm will create a kernel
|
||||
* thread and call the handler to handle I/O requests.
|
||||
* @priv: Private data for the handler
|
||||
* @is_default: If it is the default client
|
||||
* @name: The name of ioreq client
|
||||
*
|
||||
* Return: acrn_ioreq_client pointer on success, NULL on error
|
||||
*/
|
||||
struct acrn_ioreq_client *acrn_ioreq_client_create(struct acrn_vm *vm,
|
||||
ioreq_handler_t handler,
|
||||
void *priv, bool is_default,
|
||||
const char *name)
|
||||
{
|
||||
struct acrn_ioreq_client *client;
|
||||
|
||||
if (!handler && !is_default) {
|
||||
dev_dbg(acrn_dev.this_device,
|
||||
"Cannot create non-default client w/o handler!\n");
|
||||
return NULL;
|
||||
}
|
||||
client = kzalloc(sizeof(*client), GFP_KERNEL);
|
||||
if (!client)
|
||||
return NULL;
|
||||
|
||||
client->handler = handler;
|
||||
client->vm = vm;
|
||||
client->priv = priv;
|
||||
client->is_default = is_default;
|
||||
if (name)
|
||||
strncpy(client->name, name, sizeof(client->name) - 1);
|
||||
rwlock_init(&client->range_lock);
|
||||
INIT_LIST_HEAD(&client->range_list);
|
||||
init_waitqueue_head(&client->wq);
|
||||
|
||||
if (client->handler) {
|
||||
client->thread = kthread_run(ioreq_task, client, "VM%u-%s",
|
||||
client->vm->vmid, client->name);
|
||||
if (IS_ERR(client->thread)) {
|
||||
kfree(client);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
spin_lock_bh(&vm->ioreq_clients_lock);
|
||||
if (is_default)
|
||||
vm->default_client = client;
|
||||
else
|
||||
list_add(&client->list, &vm->ioreq_clients);
|
||||
spin_unlock_bh(&vm->ioreq_clients_lock);
|
||||
|
||||
dev_dbg(acrn_dev.this_device, "Created ioreq client %s.\n", name);
|
||||
return client;
|
||||
}
|
||||
|
||||
/**
|
||||
* acrn_ioreq_client_destroy() - Destroy an ioreq client
|
||||
* @client: The ioreq client
|
||||
*/
|
||||
void acrn_ioreq_client_destroy(struct acrn_ioreq_client *client)
|
||||
{
|
||||
struct acrn_ioreq_range *range, *next;
|
||||
struct acrn_vm *vm = client->vm;
|
||||
|
||||
dev_dbg(acrn_dev.this_device,
|
||||
"Destroy ioreq client %s.\n", client->name);
|
||||
ioreq_pause();
|
||||
set_bit(ACRN_IOREQ_CLIENT_DESTROYING, &client->flags);
|
||||
if (client->is_default)
|
||||
wake_up_interruptible(&client->wq);
|
||||
else
|
||||
kthread_stop(client->thread);
|
||||
|
||||
spin_lock_bh(&vm->ioreq_clients_lock);
|
||||
if (client->is_default)
|
||||
vm->default_client = NULL;
|
||||
else
|
||||
list_del(&client->list);
|
||||
spin_unlock_bh(&vm->ioreq_clients_lock);
|
||||
|
||||
write_lock_bh(&client->range_lock);
|
||||
list_for_each_entry_safe(range, next, &client->range_list, list) {
|
||||
list_del(&range->list);
|
||||
kfree(range);
|
||||
}
|
||||
write_unlock_bh(&client->range_lock);
|
||||
kfree(client);
|
||||
|
||||
ioreq_resume();
|
||||
}
|
||||
|
||||
static int acrn_ioreq_dispatch(struct acrn_vm *vm)
|
||||
{
|
||||
struct acrn_ioreq_client *client;
|
||||
struct acrn_io_request *req;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < vm->vcpu_num; i++) {
|
||||
req = vm->ioreq_buf->req_slot + i;
|
||||
|
||||
/* barrier the read of processed of acrn_io_request */
|
||||
if (smp_load_acquire(&req->processed) ==
|
||||
ACRN_IOREQ_STATE_PENDING) {
|
||||
/* Complete the IO request directly in clearing stage */
|
||||
if (test_bit(ACRN_VM_FLAG_CLEARING_IOREQ, &vm->flags)) {
|
||||
ioreq_complete_request(vm, i, req);
|
||||
continue;
|
||||
}
|
||||
|
||||
spin_lock_bh(&vm->ioreq_clients_lock);
|
||||
client = find_ioreq_client(vm, req);
|
||||
if (!client) {
|
||||
dev_err(acrn_dev.this_device,
|
||||
"Failed to find ioreq client!\n");
|
||||
spin_unlock_bh(&vm->ioreq_clients_lock);
|
||||
return -EINVAL;
|
||||
}
|
||||
if (!client->is_default)
|
||||
req->kernel_handled = 1;
|
||||
else
|
||||
req->kernel_handled = 0;
|
||||
/*
|
||||
* Add barrier() to make sure the writes are done
|
||||
* before setting ACRN_IOREQ_STATE_PROCESSING
|
||||
*/
|
||||
smp_store_release(&req->processed,
|
||||
ACRN_IOREQ_STATE_PROCESSING);
|
||||
set_bit(i, client->ioreqs_map);
|
||||
wake_up_interruptible(&client->wq);
|
||||
spin_unlock_bh(&vm->ioreq_clients_lock);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void ioreq_dispatcher(struct work_struct *work)
|
||||
{
|
||||
struct acrn_vm *vm;
|
||||
|
||||
read_lock(&acrn_vm_list_lock);
|
||||
list_for_each_entry(vm, &acrn_vm_list, list) {
|
||||
if (!vm->ioreq_buf)
|
||||
break;
|
||||
acrn_ioreq_dispatch(vm);
|
||||
}
|
||||
read_unlock(&acrn_vm_list_lock);
|
||||
}
|
||||
|
||||
static void ioreq_intr_handler(void)
|
||||
{
|
||||
queue_work(ioreq_wq, &ioreq_work);
|
||||
}
|
||||
|
||||
static void ioreq_pause(void)
|
||||
{
|
||||
/* Flush and unarm the handler to ensure no I/O requests pending */
|
||||
acrn_remove_intr_handler();
|
||||
drain_workqueue(ioreq_wq);
|
||||
}
|
||||
|
||||
static void ioreq_resume(void)
|
||||
{
|
||||
/* Schedule after enabling in case other clients miss interrupt */
|
||||
acrn_setup_intr_handler(ioreq_intr_handler);
|
||||
queue_work(ioreq_wq, &ioreq_work);
|
||||
}
|
||||
|
||||
int acrn_ioreq_intr_setup(void)
|
||||
{
|
||||
acrn_setup_intr_handler(ioreq_intr_handler);
|
||||
ioreq_wq = alloc_workqueue("ioreq_wq",
|
||||
WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
|
||||
if (!ioreq_wq) {
|
||||
dev_err(acrn_dev.this_device, "Failed to alloc workqueue!\n");
|
||||
acrn_remove_intr_handler();
|
||||
return -ENOMEM;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void acrn_ioreq_intr_remove(void)
|
||||
{
|
||||
if (ioreq_wq)
|
||||
destroy_workqueue(ioreq_wq);
|
||||
acrn_remove_intr_handler();
|
||||
}
|
||||
|
||||
int acrn_ioreq_init(struct acrn_vm *vm, u64 buf_vma)
|
||||
{
|
||||
struct acrn_ioreq_buffer *set_buffer;
|
||||
struct page *page;
|
||||
int ret;
|
||||
|
||||
if (vm->ioreq_buf)
|
||||
return -EEXIST;
|
||||
|
||||
set_buffer = kzalloc(sizeof(*set_buffer), GFP_KERNEL);
|
||||
if (!set_buffer)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = pin_user_pages_fast(buf_vma, 1,
|
||||
FOLL_WRITE | FOLL_LONGTERM, &page);
|
||||
if (unlikely(ret != 1) || !page) {
|
||||
dev_err(acrn_dev.this_device, "Failed to pin ioreq page!\n");
|
||||
ret = -EFAULT;
|
||||
goto free_buf;
|
||||
}
|
||||
|
||||
vm->ioreq_buf = page_address(page);
|
||||
vm->ioreq_page = page;
|
||||
set_buffer->ioreq_buf = page_to_phys(page);
|
||||
ret = hcall_set_ioreq_buffer(vm->vmid, virt_to_phys(set_buffer));
|
||||
if (ret < 0) {
|
||||
dev_err(acrn_dev.this_device, "Failed to init ioreq buffer!\n");
|
||||
unpin_user_page(page);
|
||||
vm->ioreq_buf = NULL;
|
||||
goto free_buf;
|
||||
}
|
||||
|
||||
dev_dbg(acrn_dev.this_device,
|
||||
"Init ioreq buffer %pK!\n", vm->ioreq_buf);
|
||||
ret = 0;
|
||||
free_buf:
|
||||
kfree(set_buffer);
|
||||
return ret;
|
||||
}
|
||||
|
||||
void acrn_ioreq_deinit(struct acrn_vm *vm)
|
||||
{
|
||||
struct acrn_ioreq_client *client, *next;
|
||||
|
||||
dev_dbg(acrn_dev.this_device,
|
||||
"Deinit ioreq buffer %pK!\n", vm->ioreq_buf);
|
||||
/* Destroy all clients belonging to this VM */
|
||||
list_for_each_entry_safe(client, next, &vm->ioreq_clients, list)
|
||||
acrn_ioreq_client_destroy(client);
|
||||
if (vm->default_client)
|
||||
acrn_ioreq_client_destroy(vm->default_client);
|
||||
|
||||
if (vm->ioreq_buf && vm->ioreq_page) {
|
||||
unpin_user_page(vm->ioreq_page);
|
||||
vm->ioreq_buf = NULL;
|
||||
}
|
||||
}
|
||||
|
|
@ -15,9 +15,12 @@
|
|||
#include "acrn_drv.h"
|
||||
|
||||
/* List of VMs */
|
||||
static LIST_HEAD(acrn_vm_list);
|
||||
/* To protect acrn_vm_list */
|
||||
static DEFINE_MUTEX(acrn_vm_list_lock);
|
||||
LIST_HEAD(acrn_vm_list);
|
||||
/*
|
||||
* acrn_vm_list is read in a worker thread which dispatch I/O requests and
|
||||
* is wrote in VM creation ioctl. Use the rwlock mechanism to protect it.
|
||||
*/
|
||||
DEFINE_RWLOCK(acrn_vm_list_lock);
|
||||
|
||||
struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
|
||||
struct acrn_vm_creation *vm_param)
|
||||
|
|
@ -32,12 +35,20 @@ struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
|
|||
}
|
||||
|
||||
mutex_init(&vm->regions_mapping_lock);
|
||||
INIT_LIST_HEAD(&vm->ioreq_clients);
|
||||
spin_lock_init(&vm->ioreq_clients_lock);
|
||||
vm->vmid = vm_param->vmid;
|
||||
vm->vcpu_num = vm_param->vcpu_num;
|
||||
|
||||
mutex_lock(&acrn_vm_list_lock);
|
||||
if (acrn_ioreq_init(vm, vm_param->ioreq_buf) < 0) {
|
||||
hcall_destroy_vm(vm_param->vmid);
|
||||
vm->vmid = ACRN_INVALID_VMID;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
write_lock_bh(&acrn_vm_list_lock);
|
||||
list_add(&vm->list, &acrn_vm_list);
|
||||
mutex_unlock(&acrn_vm_list_lock);
|
||||
write_unlock_bh(&acrn_vm_list_lock);
|
||||
|
||||
dev_dbg(acrn_dev.this_device, "VM %u created.\n", vm->vmid);
|
||||
return vm;
|
||||
|
|
@ -52,9 +63,11 @@ int acrn_vm_destroy(struct acrn_vm *vm)
|
|||
return 0;
|
||||
|
||||
/* Remove from global VM list */
|
||||
mutex_lock(&acrn_vm_list_lock);
|
||||
write_lock_bh(&acrn_vm_list_lock);
|
||||
list_del_init(&vm->list);
|
||||
mutex_unlock(&acrn_vm_list_lock);
|
||||
write_unlock_bh(&acrn_vm_list_lock);
|
||||
|
||||
acrn_ioreq_deinit(vm);
|
||||
|
||||
ret = hcall_destroy_vm(vm->vmid);
|
||||
if (ret < 0) {
|
||||
|
|
|
|||
|
|
@ -14,6 +14,145 @@
|
|||
#include <linux/types.h>
|
||||
#include <linux/uuid.h>
|
||||
|
||||
#define ACRN_IO_REQUEST_MAX 16
|
||||
|
||||
#define ACRN_IOREQ_STATE_PENDING 0
|
||||
#define ACRN_IOREQ_STATE_COMPLETE 1
|
||||
#define ACRN_IOREQ_STATE_PROCESSING 2
|
||||
#define ACRN_IOREQ_STATE_FREE 3
|
||||
|
||||
#define ACRN_IOREQ_TYPE_PORTIO 0
|
||||
#define ACRN_IOREQ_TYPE_MMIO 1
|
||||
|
||||
#define ACRN_IOREQ_DIR_READ 0
|
||||
#define ACRN_IOREQ_DIR_WRITE 1
|
||||
|
||||
/**
|
||||
* struct acrn_mmio_request - Info of a MMIO I/O request
|
||||
* @direction: Access direction of this request (ACRN_IOREQ_DIR_*)
|
||||
* @reserved: Reserved for alignment and should be 0
|
||||
* @address: Access address of this MMIO I/O request
|
||||
* @size: Access size of this MMIO I/O request
|
||||
* @value: Read/write value of this MMIO I/O request
|
||||
*/
|
||||
struct acrn_mmio_request {
|
||||
__u32 direction;
|
||||
__u32 reserved;
|
||||
__u64 address;
|
||||
__u64 size;
|
||||
__u64 value;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct acrn_pio_request - Info of a PIO I/O request
|
||||
* @direction: Access direction of this request (ACRN_IOREQ_DIR_*)
|
||||
* @reserved: Reserved for alignment and should be 0
|
||||
* @address: Access address of this PIO I/O request
|
||||
* @size: Access size of this PIO I/O request
|
||||
* @value: Read/write value of this PIO I/O request
|
||||
*/
|
||||
struct acrn_pio_request {
|
||||
__u32 direction;
|
||||
__u32 reserved;
|
||||
__u64 address;
|
||||
__u64 size;
|
||||
__u32 value;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct acrn_io_request - 256-byte ACRN I/O request
|
||||
* @type: Type of this request (ACRN_IOREQ_TYPE_*).
|
||||
* @completion_polling: Polling flag. Hypervisor will poll completion of the
|
||||
* I/O request if this flag set.
|
||||
* @reserved0: Reserved fields.
|
||||
* @reqs: Union of different types of request. Byte offset: 64.
|
||||
* @reqs.pio_request: PIO request data of the I/O request.
|
||||
* @reqs.mmio_request: MMIO request data of the I/O request.
|
||||
* @reqs.data: Raw data of the I/O request.
|
||||
* @reserved1: Reserved fields.
|
||||
* @kernel_handled: Flag indicates this request need be handled in kernel.
|
||||
* @processed: The status of this request (ACRN_IOREQ_STATE_*).
|
||||
*
|
||||
* The state transitions of ACRN I/O request:
|
||||
*
|
||||
* FREE -> PENDING -> PROCESSING -> COMPLETE -> FREE -> ...
|
||||
*
|
||||
* An I/O request in COMPLETE or FREE state is owned by the hypervisor. HSM and
|
||||
* ACRN userspace are in charge of processing the others.
|
||||
*
|
||||
* On basis of the states illustrated above, a typical lifecycle of ACRN IO
|
||||
* request would look like:
|
||||
*
|
||||
* Flow (assume the initial state is FREE)
|
||||
* |
|
||||
* | Service VM vCPU 0 Service VM vCPU x User vCPU y
|
||||
* |
|
||||
* | hypervisor:
|
||||
* | fills in type, addr, etc.
|
||||
* | pauses the User VM vCPU y
|
||||
* | sets the state to PENDING (a)
|
||||
* | fires an upcall to Service VM
|
||||
* |
|
||||
* | HSM:
|
||||
* | scans for PENDING requests
|
||||
* | sets the states to PROCESSING (b)
|
||||
* | assigns the requests to clients (c)
|
||||
* V
|
||||
* | client:
|
||||
* | scans for the assigned requests
|
||||
* | handles the requests (d)
|
||||
* | HSM:
|
||||
* | sets states to COMPLETE
|
||||
* | notifies the hypervisor
|
||||
* |
|
||||
* | hypervisor:
|
||||
* | resumes User VM vCPU y (e)
|
||||
* |
|
||||
* | hypervisor:
|
||||
* | post handling (f)
|
||||
* V sets states to FREE
|
||||
*
|
||||
* Note that the procedures (a) to (f) in the illustration above require to be
|
||||
* strictly processed in the order. One vCPU cannot trigger another request of
|
||||
* I/O emulation before completing the previous one.
|
||||
*
|
||||
* Atomic and barriers are required when HSM and hypervisor accessing the state
|
||||
* of &struct acrn_io_request.
|
||||
*
|
||||
*/
|
||||
struct acrn_io_request {
|
||||
__u32 type;
|
||||
__u32 completion_polling;
|
||||
__u32 reserved0[14];
|
||||
union {
|
||||
struct acrn_pio_request pio_request;
|
||||
struct acrn_mmio_request mmio_request;
|
||||
__u64 data[8];
|
||||
} reqs;
|
||||
__u32 reserved1;
|
||||
__u32 kernel_handled;
|
||||
__u32 processed;
|
||||
} __attribute__((aligned(256)));
|
||||
|
||||
struct acrn_io_request_buffer {
|
||||
union {
|
||||
struct acrn_io_request req_slot[ACRN_IO_REQUEST_MAX];
|
||||
__u8 reserved[4096];
|
||||
};
|
||||
};
|
||||
|
||||
/**
|
||||
* struct acrn_ioreq_notify - The structure of ioreq completion notification
|
||||
* @vmid: User VM ID
|
||||
* @reserved: Reserved and should be 0
|
||||
* @vcpu: vCPU ID
|
||||
*/
|
||||
struct acrn_ioreq_notify {
|
||||
__u16 vmid;
|
||||
__u16 reserved;
|
||||
__u32 vcpu;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct acrn_vm_creation - Info to create a User VM
|
||||
* @vmid: User VM ID returned from the hypervisor
|
||||
|
|
@ -218,6 +357,17 @@ struct acrn_vm_memmap {
|
|||
#define ACRN_IOCTL_SET_VCPU_REGS \
|
||||
_IOW(ACRN_IOCTL_TYPE, 0x16, struct acrn_vcpu_regs)
|
||||
|
||||
#define ACRN_IOCTL_NOTIFY_REQUEST_FINISH \
|
||||
_IOW(ACRN_IOCTL_TYPE, 0x31, struct acrn_ioreq_notify)
|
||||
#define ACRN_IOCTL_CREATE_IOREQ_CLIENT \
|
||||
_IO(ACRN_IOCTL_TYPE, 0x32)
|
||||
#define ACRN_IOCTL_ATTACH_IOREQ_CLIENT \
|
||||
_IO(ACRN_IOCTL_TYPE, 0x33)
|
||||
#define ACRN_IOCTL_DESTROY_IOREQ_CLIENT \
|
||||
_IO(ACRN_IOCTL_TYPE, 0x34)
|
||||
#define ACRN_IOCTL_CLEAR_VM_IOREQ \
|
||||
_IO(ACRN_IOCTL_TYPE, 0x35)
|
||||
|
||||
#define ACRN_IOCTL_SET_MEMSEG \
|
||||
_IOW(ACRN_IOCTL_TYPE, 0x41, struct acrn_vm_memmap)
|
||||
#define ACRN_IOCTL_UNSET_MEMSEG \
|
||||
|
|
|
|||
Loading…
Reference in New Issue