cregit-Linux how code gets into the kernel

Release 4.15 net/vmw_vsock/hyperv_transport.c

Directory: net/vmw_vsock
/*
 * Hyper-V transport for vsock
 *
 * Hyper-V Sockets supplies a byte-stream based communication mechanism
 * between the host and the VM. This driver implements the necessary
 * support in the VM by introducing the new vsock transport.
 *
 * Copyright (c) 2017, Microsoft Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/hyperv.h>
#include <net/sock.h>
#include <net/af_vsock.h>

/* The host side's design of the feature requires 6 exact 4KB pages for
 * recv/send rings respectively -- this is suboptimal considering memory
 * consumption, however unluckily we have to live with it, before the
 * host comes up with a better design in the future.
 */

#define PAGE_SIZE_4K		4096

#define RINGBUFFER_HVS_RCV_SIZE (PAGE_SIZE_4K * 6)

#define RINGBUFFER_HVS_SND_SIZE (PAGE_SIZE_4K * 6)

/* The MTU is 16KB per the host side's design */

#define HVS_MTU_SIZE		(1024 * 16)


struct vmpipe_proto_header {
	
u32 pkt_type;
	
u32 data_size;
};

/* For recv, we use the VMBus in-place packet iterator APIs to directly copy
 * data from the ringbuffer into the userspace buffer.
 */

struct hvs_recv_buf {
	/* The header before the payload data */
	
struct vmpipe_proto_header hdr;

	/* The payload */
	
u8 data[HVS_MTU_SIZE];
};

/* We can send up to HVS_MTU_SIZE bytes of payload to the host, but let's use
 * a small size, i.e. HVS_SEND_BUF_SIZE, to minimize the dynamically-allocated
 * buffer, because tests show there is no significant performance difference.
 *
 * Note: the buffer can be eliminated in the future when we add new VMBus
 * ringbuffer APIs that allow us to directly copy data from userspace buffer
 * to VMBus ringbuffer.
 */

#define HVS_SEND_BUF_SIZE (PAGE_SIZE_4K - sizeof(struct vmpipe_proto_header))


struct hvs_send_buf {
	/* The header before the payload data */
	
struct vmpipe_proto_header hdr;

	/* The payload */
	
u8 data[HVS_SEND_BUF_SIZE];
};


#define HVS_HEADER_LEN	(sizeof(struct vmpacket_descriptor) + \
                         sizeof(struct vmpipe_proto_header))

/* See 'prev_indices' in hv_ringbuffer_read(), hv_ringbuffer_write(), and
 * __hv_pkt_iter_next().
 */

#define VMBUS_PKT_TRAILER_SIZE	(sizeof(u64))


#define HVS_PKT_LEN(payload_len)	(HVS_HEADER_LEN + \
                                         ALIGN((payload_len), 8) + \
                                         VMBUS_PKT_TRAILER_SIZE)


union hvs_service_id {
	
uuid_le	srv_id;

	struct {
		
unsigned int svm_port;
		
unsigned char b[sizeof(uuid_le) - sizeof(unsigned int)];
	};
};

/* Per-socket state (accessed via vsk->trans) */

struct hvsock {
	
struct vsock_sock *vsk;

	
uuid_le vm_srv_id;
	
uuid_le host_srv_id;

	
struct vmbus_channel *chan;
	
struct vmpacket_descriptor *recv_desc;

	/* The length of the payload not delivered to userland yet */
	
u32 recv_data_len;
	/* The offset of the payload */
	
u32 recv_data_off;

	/* Have we sent the zero-length packet (FIN)? */
	
bool fin_sent;
};

/* In the VM, we support Hyper-V Sockets with AF_VSOCK, and the endpoint is
 * <cid, port> (see struct sockaddr_vm). Note: cid is not really used here:
 * when we write apps to connect to the host, we can only use VMADDR_CID_ANY
 * or VMADDR_CID_HOST (both are equivalent) as the remote cid, and when we
 * write apps to bind() & listen() in the VM, we can only use VMADDR_CID_ANY
 * as the local cid.
 *
 * On the host, Hyper-V Sockets are supported by Winsock AF_HYPERV:
 * https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user-
 * guide/make-integration-service, and the endpoint is <VmID, ServiceId> with
 * the below sockaddr:
 *
 * struct SOCKADDR_HV
 * {
 *    ADDRESS_FAMILY Family;
 *    USHORT Reserved;
 *    GUID VmId;
 *    GUID ServiceId;
 * };
 * Note: VmID is not used by Linux VM and actually it isn't transmitted via
 * VMBus, because here it's obvious the host and the VM can easily identify
 * each other. Though the VmID is useful on the host, especially in the case
 * of Windows container, Linux VM doesn't need it at all.
 *
 * To make use of the AF_VSOCK infrastructure in Linux VM, we have to limit
 * the available GUID space of SOCKADDR_HV so that we can create a mapping
 * between AF_VSOCK port and SOCKADDR_HV Service GUID. The rule of writing
 * Hyper-V Sockets apps on the host and in Linux VM is:
 *
 ****************************************************************************
 * The only valid Service GUIDs, from the perspectives of both the host and *
 * Linux VM, that can be connected by the other end, must conform to this   *
 * format: <port>-facb-11e6-bd58-64006a7986d3, and the "port" must be in    *
 * this range [0, 0x7FFFFFFF].                                              *
 ****************************************************************************
 *
 * When we write apps on the host to connect(), the GUID ServiceID is used.
 * When we write apps in Linux VM to connect(), we only need to specify the
 * port and the driver will form the GUID and use that to request the host.
 *
 * From the perspective of Linux VM:
 * 1. the local ephemeral port (i.e. the local auto-bound port when we call
 * connect() without explicit bind()) is generated by __vsock_bind_stream(),
 * and the range is [1024, 0xFFFFFFFF).
 * 2. the remote ephemeral port (i.e. the auto-generated remote port for
 * a connect request initiated by the host's connect()) is generated by
 * hvs_remote_addr_init() and the range is [0x80000000, 0xFFFFFFFF).
 */


#define MAX_LISTEN_PORT			((u32)0x7FFFFFFF)

#define MAX_VM_LISTEN_PORT		MAX_LISTEN_PORT

#define MAX_HOST_LISTEN_PORT		MAX_LISTEN_PORT

#define MIN_HOST_EPHEMERAL_PORT		(MAX_HOST_LISTEN_PORT + 1)

/* 00000000-facb-11e6-bd58-64006a7986d3 */

static const uuid_le srv_id_template =
	UUID_LE(0x00000000, 0xfacb, 0x11e6, 0xbd, 0x58,
		0x64, 0x00, 0x6a, 0x79, 0x86, 0xd3);


static bool is_valid_srv_id(const uuid_le *id) { return !memcmp(&id->b[4], &srv_id_template.b[4], sizeof(uuid_le) - 4); }

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static unsigned int get_port_by_srv_id(const uuid_le *svr_id) { return *((unsigned int *)svr_id); }

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static void hvs_addr_init(struct sockaddr_vm *addr, const uuid_le *svr_id) { unsigned int port = get_port_by_srv_id(svr_id); vsock_addr_init(addr, VMADDR_CID_ANY, port); }

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static void hvs_remote_addr_init(struct sockaddr_vm *remote, struct sockaddr_vm *local) { static u32 host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT; struct sock *sk; vsock_addr_init(remote, VMADDR_CID_ANY, VMADDR_PORT_ANY); while (1) { /* Wrap around ? */ if (host_ephemeral_port < MIN_HOST_EPHEMERAL_PORT || host_ephemeral_port == VMADDR_PORT_ANY) host_ephemeral_port = MIN_HOST_EPHEMERAL_PORT; remote->svm_port = host_ephemeral_port++; sk = vsock_find_connected_socket(remote, local); if (!sk) { /* Found an available ephemeral port */ return; } /* Release refcnt got in vsock_find_connected_socket */ sock_put(sk); } }

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static void hvs_set_channel_pending_send_size(struct vmbus_channel *chan) { set_channel_pending_send_size(chan, HVS_PKT_LEN(HVS_SEND_BUF_SIZE)); /* See hvs_stream_has_space(): we must make sure the host has seen * the new pending send size, before we can re-check the writable * bytes. */ virt_mb(); }

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static void hvs_clear_channel_pending_send_size(struct vmbus_channel *chan) { set_channel_pending_send_size(chan, 0); /* Ditto */ virt_mb(); }

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static bool hvs_channel_readable(struct vmbus_channel *chan) { u32 readable = hv_get_bytes_to_read(&chan->inbound); /* 0-size payload means FIN */ return readable >= HVS_PKT_LEN(0); }

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static int hvs_channel_readable_payload(struct vmbus_channel *chan) { u32 readable = hv_get_bytes_to_read(&chan->inbound); if (readable > HVS_PKT_LEN(0)) { /* At least we have 1 byte to read. We don't need to return * the exact readable bytes: see vsock_stream_recvmsg() -> * vsock_stream_has_data(). */ return 1; } if (readable == HVS_PKT_LEN(0)) { /* 0-size payload means FIN */ return 0; } /* No payload or FIN */ return -1; }

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static size_t hvs_channel_writable_bytes(struct vmbus_channel *chan) { u32 writeable = hv_get_bytes_to_write(&chan->outbound); size_t ret; /* The ringbuffer mustn't be 100% full, and we should reserve a * zero-length-payload packet for the FIN: see hv_ringbuffer_write() * and hvs_shutdown(). */ if (writeable <= HVS_PKT_LEN(1) + HVS_PKT_LEN(0)) return 0; ret = writeable - HVS_PKT_LEN(1) - HVS_PKT_LEN(0); return round_down(ret, 8); }

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static int hvs_send_data(struct vmbus_channel *chan, struct hvs_send_buf *send_buf, size_t to_write) { send_buf->hdr.pkt_type = 1; send_buf->hdr.data_size = to_write; return vmbus_sendpacket(chan, &send_buf->hdr, sizeof(send_buf->hdr) + to_write, 0, VM_PKT_DATA_INBAND, 0); }

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static void hvs_channel_cb(void *ctx) { struct sock *sk = (struct sock *)ctx; struct vsock_sock *vsk = vsock_sk(sk); struct hvsock *hvs = vsk->trans; struct vmbus_channel *chan = hvs->chan; if (hvs_channel_readable(chan)) sk->sk_data_ready(sk); /* See hvs_stream_has_space(): when we reach here, the writable bytes * may be already less than HVS_PKT_LEN(HVS_SEND_BUF_SIZE). */ if (hv_get_bytes_to_write(&chan->outbound) > 0) sk->sk_write_space(sk); }

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static void hvs_close_connection(struct vmbus_channel *chan) { struct sock *sk = get_per_channel_state(chan); struct vsock_sock *vsk = vsock_sk(sk); lock_sock(sk); sk->sk_state = TCP_CLOSE; sock_set_flag(sk, SOCK_DONE); vsk->peer_shutdown |= SEND_SHUTDOWN | RCV_SHUTDOWN; sk->sk_state_change(sk); release_sock(sk); }

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static void hvs_open_connection(struct vmbus_channel *chan) { uuid_le *if_instance, *if_type; unsigned char conn_from_host; struct sockaddr_vm addr; struct sock *sk, *new = NULL; struct vsock_sock *vnew; struct hvsock *hvs, *hvs_new; int ret; if_type = &chan->offermsg.offer.if_type; if_instance = &chan->offermsg.offer.if_instance; conn_from_host = chan->offermsg.offer.u.pipe.user_def[0]; /* The host or the VM should only listen on a port in * [0, MAX_LISTEN_PORT] */ if (!is_valid_srv_id(if_type) || get_port_by_srv_id(if_type) > MAX_LISTEN_PORT) return; hvs_addr_init(&addr, conn_from_host ? if_type : if_instance); sk = vsock_find_bound_socket(&addr); if (!sk) return; lock_sock(sk); if ((conn_from_host && sk->sk_state != TCP_LISTEN) || (!conn_from_host && sk->sk_state != TCP_SYN_SENT)) goto out; if (conn_from_host) { if (sk->sk_ack_backlog >= sk->sk_max_ack_backlog) goto out; new = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, sk->sk_type, 0); if (!new) goto out; new->sk_state = TCP_SYN_SENT; vnew = vsock_sk(new); hvs_new = vnew->trans; hvs_new->chan = chan; } else { hvs = vsock_sk(sk)->trans; hvs->chan = chan; } set_channel_read_mode(chan, HV_CALL_DIRECT); ret = vmbus_open(chan, RINGBUFFER_HVS_SND_SIZE, RINGBUFFER_HVS_RCV_SIZE, NULL, 0, hvs_channel_cb, conn_from_host ? new : sk); if (ret != 0) { if (conn_from_host) { hvs_new->chan = NULL; sock_put(new); } else { hvs->chan = NULL; } goto out; } set_per_channel_state(chan, conn_from_host ? new : sk); vmbus_set_chn_rescind_callback(chan, hvs_close_connection); if (conn_from_host) { new->sk_state = TCP_ESTABLISHED; sk->sk_ack_backlog++; hvs_addr_init(&vnew->local_addr, if_type); hvs_remote_addr_init(&vnew->remote_addr, &vnew->local_addr); hvs_new->vm_srv_id = *if_type; hvs_new->host_srv_id = *if_instance; vsock_insert_connected(vnew); vsock_enqueue_accept(sk, new); } else { sk->sk_state = TCP_ESTABLISHED; sk->sk_socket->state = SS_CONNECTED; vsock_insert_connected(vsock_sk(sk)); } sk->sk_state_change(sk); out: /* Release refcnt obtained when we called vsock_find_bound_socket() */ sock_put(sk); release_sock(sk); }

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static u32 hvs_get_local_cid(void) { return VMADDR_CID_ANY; }

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static int hvs_sock_init(struct vsock_sock *vsk, struct vsock_sock *psk) { struct hvsock *hvs; hvs = kzalloc(sizeof(*hvs), GFP_KERNEL); if (!hvs) return -ENOMEM; vsk->trans = hvs; hvs->vsk = vsk; return 0; }

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static int hvs_connect(struct vsock_sock *vsk) { union hvs_service_id vm, host; struct hvsock *h = vsk->trans; vm.srv_id = srv_id_template; vm.svm_port = vsk->local_addr.svm_port; h->vm_srv_id = vm.srv_id; host.srv_id = srv_id_template; host.svm_port = vsk->remote_addr.svm_port; h->host_srv_id = host.srv_id; return vmbus_send_tl_connect_request(&h->vm_srv_id, &h->host_srv_id); }

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static int hvs_shutdown(struct vsock_sock *vsk, int mode) { struct sock *sk = sk_vsock(vsk); struct vmpipe_proto_header hdr; struct hvs_send_buf *send_buf; struct hvsock *hvs; if (!(mode & SEND_SHUTDOWN)) return 0; lock_sock(sk); hvs = vsk->trans; if (hvs->fin_sent) goto out; send_buf = (struct hvs_send_buf *)&hdr; /* It can't fail: see hvs_channel_writable_bytes(). */ (void)hvs_send_data(hvs->chan, send_buf, 0); hvs->fin_sent = true; out: release_sock(sk); return 0; }

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static void hvs_release(struct vsock_sock *vsk) { struct sock *sk = sk_vsock(vsk); struct hvsock *hvs = vsk->trans; struct vmbus_channel *chan; lock_sock(sk); sk->sk_state = TCP_CLOSING; vsock_remove_sock(vsk); release_sock(sk); chan = hvs->chan; if (chan) hvs_shutdown(vsk, RCV_SHUTDOWN | SEND_SHUTDOWN); }

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static void hvs_destruct(struct vsock_sock *vsk) { struct hvsock *hvs = vsk->trans; struct vmbus_channel *chan = hvs->chan; if (chan) vmbus_hvsock_device_unregister(chan); kfree(hvs); }

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static int hvs_dgram_bind(struct vsock_sock *vsk, struct sockaddr_vm *addr) { return -EOPNOTSUPP; }

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static int hvs_dgram_dequeue(struct vsock_sock *vsk, struct msghdr *msg, size_t len, int flags) { return -EOPNOTSUPP; }

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static int hvs_dgram_enqueue(struct vsock_sock *vsk, struct sockaddr_vm *remote, struct msghdr *msg, size_t dgram_len) { return -EOPNOTSUPP; }

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static bool hvs_dgram_allow(u32 cid, u32 port) { return false; }

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static int hvs_update_recv_data(struct hvsock *hvs) { struct hvs_recv_buf *recv_buf; u32 payload_len; recv_buf = (struct hvs_recv_buf *)(hvs->recv_desc + 1); payload_len = recv_buf->hdr.data_size; if (payload_len > HVS_MTU_SIZE) return -EIO; if (payload_len == 0) hvs->vsk->peer_shutdown |= SEND_SHUTDOWN; hvs->recv_data_len = payload_len; hvs->recv_data_off = 0; return 0; }

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static ssize_t hvs_stream_dequeue(struct vsock_sock *vsk, struct msghdr *msg, size_t len, int flags) { struct hvsock *hvs = vsk->trans; bool need_refill = !hvs->recv_desc; struct hvs_recv_buf *recv_buf; u32 to_read; int ret; if (flags & MSG_PEEK) return -EOPNOTSUPP; if (need_refill) { hvs->recv_desc = hv_pkt_iter_first(hvs->chan); ret = hvs_update_recv_data(hvs); if (ret) return ret; } recv_buf = (struct hvs_recv_buf *)(hvs->recv_desc + 1); to_read = min_t(u32, len, hvs->recv_data_len); ret = memcpy_to_msg(msg, recv_buf->data + hvs->recv_data_off, to_read); if (ret != 0) return ret; hvs->recv_data_len -= to_read; if (hvs->recv_data_len == 0) { hvs->recv_desc = hv_pkt_iter_next(hvs->chan, hvs->recv_desc); if (hvs->recv_desc) { ret = hvs_update_recv_data(hvs); if (ret) return ret; } } else { hvs->recv_data_off += to_read; } return to_read; }

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static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg, size_t len) { struct hvsock *hvs = vsk->trans; struct vmbus_channel *chan = hvs->chan; struct hvs_send_buf *send_buf; ssize_t to_write, max_writable, ret; BUILD_BUG_ON(sizeof(*send_buf) != PAGE_SIZE_4K); send_buf = kmalloc(sizeof(*send_buf), GFP_KERNEL); if (!send_buf) return -ENOMEM; max_writable = hvs_channel_writable_bytes(chan); to_write = min_t(ssize_t, len, max_writable); to_write = min_t(ssize_t, to_write, HVS_SEND_BUF_SIZE); ret = memcpy_from_msg(send_buf->data, msg, to_write); if (ret < 0) goto out; ret = hvs_send_data(hvs->chan, send_buf, to_write); if (ret < 0) goto out; ret = to_write; out: kfree(send_buf); return ret; }

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static s64 hvs_stream_has_data(struct vsock_sock *vsk) { struct hvsock *hvs = vsk->trans; s64 ret; if (hvs->recv_data_len > 0) return 1; switch (hvs_channel_readable_payload(hvs->chan)) { case 1: ret = 1; break; case 0: vsk->peer_shutdown |= SEND_SHUTDOWN; ret = 0; break; default: /* -1 */ ret = 0; break; } return ret; }

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static s64 hvs_stream_has_space(struct vsock_sock *vsk) { struct hvsock *hvs = vsk->trans; struct vmbus_channel *chan = hvs->chan; s64 ret; ret = hvs_channel_writable_bytes(chan); if (ret > 0) { hvs_clear_channel_pending_send_size(chan); } else { /* See hvs_channel_cb() */ hvs_set_channel_pending_send_size(chan); /* Re-check the writable bytes to avoid race */ ret = hvs_channel_writable_bytes(chan); if (ret > 0) hvs_clear_channel_pending_send_size(chan); } return ret; }

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static u64 hvs_stream_rcvhiwat(struct vsock_sock *vsk) { return HVS_MTU_SIZE + 1; }

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static bool hvs_stream_is_active(struct vsock_sock *vsk) { struct hvsock *hvs = vsk->trans; return hvs->chan != NULL; }

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static bool hvs_stream_allow(u32 cid, u32 port) { /* The host's port range [MIN_HOST_EPHEMERAL_PORT, 0xFFFFFFFF) is * reserved as ephemeral ports, which are used as the host's ports * when the host initiates connections. * * Perform this check in the guest so an immediate error is produced * instead of a timeout. */ if (port > MAX_HOST_LISTEN_PORT) return false; if (cid == VMADDR_CID_HOST) return true; return false; }

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static int hvs_notify_poll_in(struct vsock_sock *vsk, size_t target, bool *readable) { struct hvsock *hvs = vsk->trans; *readable = hvs_channel_readable(hvs->chan); return 0; }

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static int hvs_notify_poll_out(struct vsock_sock *vsk, size_t target, bool *writable) { *writable = hvs_stream_has_space(vsk) > 0; return 0; }

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static int hvs_notify_recv_init(struct vsock_sock *vsk, size_t target, struct vsock_transport_recv_notify_data *d) { return 0; }

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static int hvs_notify_recv_pre_block(struct vsock_sock *vsk, size_t target, struct vsock_transport_recv_notify_data *d) { return 0; }

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static int hvs_notify_recv_pre_dequeue(struct vsock_sock *vsk, size_t target, struct vsock_transport_recv_notify_data *d) { return 0; }

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static int hvs_notify_recv_post_dequeue(struct vsock_sock *vsk, size_t target, ssize_t copied, bool data_read, struct vsock_transport_recv_notify_data *d) { return 0; }

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static int hvs_notify_send_init(struct vsock_sock *vsk, struct vsock_transport_send_notify_data *d) { return 0; }

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static int hvs_notify_send_pre_block(struct vsock_sock *vsk, struct vsock_transport_send_notify_data *d) { return 0; }

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static int hvs_notify_send_pre_enqueue(struct vsock_sock *vsk, struct vsock_transport_send_notify_data *d) { return 0; }

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static int hvs_notify_send_post_enqueue(struct vsock_sock *vsk, ssize_t written, struct vsock_transport_send_notify_data *d) { return 0; }

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static void hvs_set_buffer_size(struct vsock_sock *vsk, u64 val) { /* Ignored. */ }

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static void hvs_set_min_buffer_size(struct vsock_sock *vsk, u64 val) { /* Ignored. */ }

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static void hvs_set_max_buffer_size(struct vsock_sock *vsk, u64 val) { /* Ignored. */ }

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static u64 hvs_get_buffer_size(struct vsock_sock *vsk) { return -ENOPROTOOPT; }

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static u64 hvs_get_min_buffer_size(struct vsock_sock *vsk) { return -ENOPROTOOPT; }

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static u64 hvs_get_max_buffer_size(struct vsock_sock *vsk) { return -ENOPROTOOPT; }

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static struct vsock_transport hvs_transport = { .get_local_cid = hvs_get_local_cid, .init = hvs_sock_init, .destruct = hvs_destruct, .release = hvs_release, .connect = hvs_connect, .shutdown = hvs_shutdown, .dgram_bind = hvs_dgram_bind, .dgram_dequeue = hvs_dgram_dequeue, .dgram_enqueue = hvs_dgram_enqueue, .dgram_allow = hvs_dgram_allow, .stream_dequeue = hvs_stream_dequeue, .stream_enqueue = hvs_stream_enqueue, .stream_has_data = hvs_stream_has_data, .stream_has_space = hvs_stream_has_space, .stream_rcvhiwat = hvs_stream_rcvhiwat, .stream_is_active = hvs_stream_is_active, .stream_allow = hvs_stream_allow, .notify_poll_in = hvs_notify_poll_in, .notify_poll_out = hvs_notify_poll_out, .notify_recv_init = hvs_notify_recv_init, .notify_recv_pre_block = hvs_notify_recv_pre_block, .notify_recv_pre_dequeue = hvs_notify_recv_pre_dequeue, .notify_recv_post_dequeue = hvs_notify_recv_post_dequeue, .notify_send_init = hvs_notify_send_init, .notify_send_pre_block = hvs_notify_send_pre_block, .notify_send_pre_enqueue = hvs_notify_send_pre_enqueue, .notify_send_post_enqueue = hvs_notify_send_post_enqueue, .set_buffer_size = hvs_set_buffer_size, .set_min_buffer_size = hvs_set_min_buffer_size, .set_max_buffer_size = hvs_set_max_buffer_size, .get_buffer_size = hvs_get_buffer_size, .get_min_buffer_size = hvs_get_min_buffer_size, .get_max_buffer_size = hvs_get_max_buffer_size, };
static int hvs_probe(struct hv_device *hdev, const struct hv_vmbus_device_id *dev_id) { struct vmbus_channel *chan = hdev->channel; hvs_open_connection(chan); /* Always return success to suppress the unnecessary error message * in vmbus_probe(): on error the host will rescind the device in * 30 seconds and we can do cleanup at that time in * vmbus_onoffer_rescind(). */ return 0; }

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static int hvs_remove(struct hv_device *hdev) { struct vmbus_channel *chan = hdev->channel; vmbus_close(chan); return 0; }

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/* This isn't really used. See vmbus_match() and vmbus_probe() */ static const struct hv_vmbus_device_id id_table[] = { {}, }; static struct hv_driver hvs_drv = { .name = "hv_sock", .hvsock = true, .id_table = id_table, .probe = hvs_probe, .remove = hvs_remove, };
static int __init hvs_init(void) { int ret; if (vmbus_proto_version < VERSION_WIN10) return -ENODEV; ret = vmbus_driver_register(&hvs_drv); if (ret != 0) return ret; ret = vsock_core_init(&hvs_transport); if (ret) { vmbus_driver_unregister(&hvs_drv); return ret; } return 0; }

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static void __exit hvs_exit(void) { vsock_core_exit(); vmbus_driver_unregister(&hvs_drv); }

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module_init(hvs_init); module_exit(hvs_exit); MODULE_DESCRIPTION("Hyper-V Sockets"); MODULE_VERSION("1.0.0"); MODULE_LICENSE("GPL"); MODULE_ALIAS_NETPROTO(PF_VSOCK);

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