[PATCH 10/12] VMCI: guest side driver implementation.
VMCI guest side driver code implementation. Signed-off-by: George Zhang Acked-by: Andy king Acked-by: Dmitry Torokhov --- drivers/misc/vmw_vmci/vmci_guest.c | 759 1 files changed, 759 insertions(+), 0 deletions(-) create mode 100644 drivers/misc/vmw_vmci/vmci_guest.c diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c new file mode 100644 index 000..d302c89 --- /dev/null +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -0,0 +1,759 @@ +/* + * VMware VMCI Driver + * + * Copyright (C) 2012 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vmci_datagram.h" +#include "vmci_doorbell.h" +#include "vmci_context.h" +#include "vmci_driver.h" +#include "vmci_event.h" + +#define PCI_VENDOR_ID_VMWARE 0x15AD +#define PCI_DEVICE_ID_VMWARE_VMCI 0x0740 + +#define VMCI_UTIL_NUM_RESOURCES 1 + +static bool vmci_disable_msi; +module_param_named(disable_msi, vmci_disable_msi, bool, 0); +MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); + +static bool vmci_disable_msix; +module_param_named(disable_msix, vmci_disable_msix, bool, 0); +MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); + +static u32 ctx_update_sub_id = VMCI_INVALID_ID; +static u32 vm_context_id = VMCI_INVALID_ID; + +struct vmci_guest_device { + struct device *dev; /* PCI device we are attached to */ + void __iomem *iobase; + + unsigned int irq; + unsigned int intr_type; + bool exclusive_vectors; + struct msix_entry msix_entries[VMCI_MAX_INTRS]; + + struct tasklet_struct datagram_tasklet; + struct tasklet_struct bm_tasklet; + + void *data_buffer; + void *notification_bitmap; +}; + +/* vmci_dev singleton device and supporting data*/ +static struct vmci_guest_device *vmci_dev_g; +static DEFINE_SPINLOCK(vmci_dev_spinlock); + +static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0); + +bool vmci_guest_code_active(void) +{ + return atomic_read(&vmci_num_guest_devices) != 0; +} + +u32 vmci_get_vm_context_id(void) +{ + if (vm_context_id == VMCI_INVALID_ID) { + u32 result; + struct vmci_datagram get_cid_msg; + get_cid_msg.dst = + vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID, +VMCI_GET_CONTEXT_ID); + get_cid_msg.src = VMCI_ANON_SRC_HANDLE; + get_cid_msg.payload_size = 0; + result = vmci_send_datagram(&get_cid_msg); + if (result >= 0) + vm_context_id = result; + } + return vm_context_id; +} + +/* + * VM to hypervisor call mechanism. We use the standard VMware naming + * convention since shared code is calling this function as well. + */ +int vmci_send_datagram(struct vmci_datagram *dg) +{ + unsigned long flags; + int result; + + /* Check args. */ + if (dg == NULL) + return VMCI_ERROR_INVALID_ARGS; + + /* +* Need to acquire spinlock on the device because the datagram +* data may be spread over multiple pages and the monitor may +* interleave device user rpc calls from multiple +* VCPUs. Acquiring the spinlock precludes that +* possibility. Disabling interrupts to avoid incoming +* datagrams during a "rep out" and possibly landing up in +* this function. +*/ + spin_lock_irqsave(&vmci_dev_spinlock, flags); + + if (vmci_dev_g) { + iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR, +dg, VMCI_DG_SIZE(dg)); + result = ioread32(vmci_dev_g->iobase + VMCI_RESULT_LOW_ADDR); + } else { + result = VMCI_ERROR_UNAVAILABLE; + } + + spin_unlock_irqrestore(&vmci_dev_spinlock, flags); + + return result; +} +EXPORT_SYMBOL_GPL(vmci_send_datagram); + +/* + * Gets called with the new context id if updated or resumed. + * Context id. + */ +static void vmci_guest_cid_update(u32 sub_id, + const struct vmci_event_data *event_data, + void *client_data) +{ + const struct vmci_event_payld_ctx *ev_payload = + vmci_event_data_const_payload(event_data); + + if (sub_id != ctx_update_sub_id) { +
[PATCH 10/12] VMCI: guest side driver implementation.
VMCI guest side driver code implementation. Signed-off-by: Dmitry Torokhov Signed-off-by: Andy King Signed-off-by: George Zhang --- drivers/misc/vmw_vmci/vmci_guest.c | 757 1 files changed, 757 insertions(+), 0 deletions(-) create mode 100644 drivers/misc/vmw_vmci/vmci_guest.c diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c new file mode 100644 index 000..bcbe8ab --- /dev/null +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -0,0 +1,757 @@ +/* + * VMware VMCI Driver + * + * Copyright (C) 2012 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vmci_common_int.h" +#include "vmci_datagram.h" +#include "vmci_doorbell.h" +#include "vmci_context.h" +#include "vmci_driver.h" +#include "vmci_event.h" + +#define VMCI_UTIL_NUM_RESOURCES 1 + +static bool vmci_disable_msi; +module_param_named(disable_msi, vmci_disable_msi, bool, 0); +MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); + +static bool vmci_disable_msix; +module_param_named(disable_msix, vmci_disable_msix, bool, 0); +MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); + +static u32 ctx_update_sub_id = VMCI_INVALID_ID; +static u32 vm_context_id = VMCI_INVALID_ID; + +struct vmci_guest_device { + struct device *dev; /* PCI device we are attached to */ + void __iomem *iobase; + + unsigned int irq; + unsigned int intr_type; + bool exclusive_vectors; + struct msix_entry msix_entries[VMCI_MAX_INTRS]; + + struct tasklet_struct datagram_tasklet; + struct tasklet_struct bm_tasklet; + + void *data_buffer; + void *notification_bitmap; +}; + +/* vmci_dev singleton device and supporting data*/ +static struct vmci_guest_device *vmci_dev_g; +static DEFINE_SPINLOCK(vmci_dev_spinlock); + +static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0); + +bool vmci_guest_code_active(void) +{ + return atomic_read(&vmci_num_guest_devices) != 0; +} + +u32 vmci_get_vm_context_id(void) +{ + if (vm_context_id == VMCI_INVALID_ID) { + u32 result; + struct vmci_datagram get_cid_msg; + get_cid_msg.dst = + vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID, +VMCI_GET_CONTEXT_ID); + get_cid_msg.src = VMCI_ANON_SRC_HANDLE; + get_cid_msg.payload_size = 0; + result = vmci_send_datagram(&get_cid_msg); + if (result >= 0) + vm_context_id = result; + } + return vm_context_id; +} + +/* + * VM to hypervisor call mechanism. We use the standard VMware naming + * convention since shared code is calling this function as well. + */ +int vmci_send_datagram(struct vmci_datagram *dg) +{ + unsigned long flags; + int result; + + /* Check args. */ + if (dg == NULL) + return VMCI_ERROR_INVALID_ARGS; + + /* +* Need to acquire spinlock on the device because the datagram +* data may be spread over multiple pages and the monitor may +* interleave device user rpc calls from multiple +* VCPUs. Acquiring the spinlock precludes that +* possibility. Disabling interrupts to avoid incoming +* datagrams during a "rep out" and possibly landing up in +* this function. +*/ + spin_lock_irqsave(&vmci_dev_spinlock, flags); + + if (vmci_dev_g) { + iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR, +dg, VMCI_DG_SIZE(dg)); + result = ioread32(vmci_dev_g->iobase + VMCI_RESULT_LOW_ADDR); + } else { + result = VMCI_ERROR_UNAVAILABLE; + } + + spin_unlock_irqrestore(&vmci_dev_spinlock, flags); + + return result; +} +EXPORT_SYMBOL_GPL(vmci_send_datagram); + +/* + * Gets called with the new context id if updated or resumed. + * Context id. + */ +static void vmci_guest_cid_update(u32 sub_id, + const struct vmci_event_data *event_data, + void *client_data) +{ + const struct vmci_event_payld_ctx *ev_payload = + vmci_event_data_const_payload(event_data); + + if (sub_id != ctx_update_sub_id) { + pr_devel("Invalid subscriber (ID=0x%x).\n", sub_
[PATCH 10/12] VMCI: guest side driver implementation.
VMCI guest side driver code implementation. Signed-off-by: George Zhang --- drivers/misc/vmw_vmci/vmci_guest.c | 762 1 files changed, 762 insertions(+), 0 deletions(-) create mode 100644 drivers/misc/vmw_vmci/vmci_guest.c diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c new file mode 100644 index 000..eedbe4d --- /dev/null +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -0,0 +1,762 @@ +/* + * VMware VMCI Driver + * + * Copyright (C) 2012 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vmci_common_int.h" +#include "vmci_datagram.h" +#include "vmci_doorbell.h" +#include "vmci_context.h" +#include "vmci_driver.h" +#include "vmci_event.h" + +#define VMCI_UTIL_NUM_RESOURCES 1 + +static bool vmci_disable_msi; +module_param_named(disable_msi, vmci_disable_msi, bool, 0); +MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); + +static bool vmci_disable_msix; +module_param_named(disable_msix, vmci_disable_msix, bool, 0); +MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); + +static u32 ctx_update_sub_id = VMCI_INVALID_ID; +static u32 vm_context_id = VMCI_INVALID_ID; + +struct vmci_guest_device { + struct device *dev; /* PCI device we are attached to */ + void __iomem *iobase; + + unsigned int irq; + unsigned int intr_type; + bool exclusive_vectors; + struct msix_entry msix_entries[VMCI_MAX_INTRS]; + + struct tasklet_struct datagram_tasklet; + struct tasklet_struct bm_tasklet; + + void *data_buffer; + void *notification_bitmap; +}; + +/* vmci_dev singleton device and supporting data*/ +static struct vmci_guest_device *vmci_dev_g; +static DEFINE_SPINLOCK(vmci_dev_spinlock); + +static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0); + +bool vmci_guest_code_active(void) +{ + return atomic_read(&vmci_num_guest_devices) != 0; +} + +u32 vmci_get_vm_context_id(void) +{ + if (vm_context_id == VMCI_INVALID_ID) { + u32 result; + struct vmci_datagram get_cid_msg; + get_cid_msg.dst = + vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID, +VMCI_GET_CONTEXT_ID); + get_cid_msg.src = VMCI_ANON_SRC_HANDLE; + get_cid_msg.payload_size = 0; + result = vmci_send_datagram(&get_cid_msg); + if (result >= 0) + vm_context_id = result; + } + return vm_context_id; +} + +/* + * VM to hypervisor call mechanism. We use the standard VMware naming + * convention since shared code is calling this function as well. + */ +int vmci_send_datagram(struct vmci_datagram *dg) +{ + unsigned long flags; + int result; + + /* Check args. */ + if (dg == NULL) + return VMCI_ERROR_INVALID_ARGS; + + /* +* Need to acquire spinlock on the device because the datagram +* data may be spread over multiple pages and the monitor may +* interleave device user rpc calls from multiple +* VCPUs. Acquiring the spinlock precludes that +* possibility. Disabling interrupts to avoid incoming +* datagrams during a "rep out" and possibly landing up in +* this function. +*/ + spin_lock_irqsave(&vmci_dev_spinlock, flags); + + if (vmci_dev_g) { + iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR, +dg, VMCI_DG_SIZE(dg)); + result = ioread32(vmci_dev_g->iobase + VMCI_RESULT_LOW_ADDR); + } else { + result = VMCI_ERROR_UNAVAILABLE; + } + + spin_unlock_irqrestore(&vmci_dev_spinlock, flags); + + return result; +} +EXPORT_SYMBOL_GPL(vmci_send_datagram); + +/* + * Gets called with the new context id if updated or resumed. + * Context id. + */ +static void vmci_guest_cid_update(u32 sub_id, + const struct vmci_event_data *event_data, + void *client_data) +{ + const struct vmci_event_payld_ctx *ev_payload = + vmci_event_data_const_payload(event_data); + + if (sub_id != ctx_update_sub_id) { + pr_devel("Invalid subscriber (ID=0x%x).\n", sub_id); + return; + } + + if (!even
[PATCH 10/12] VMCI: guest side driver implementation.
VMCI guest side driver code implementation. Signed-off-by: George Zhang --- drivers/misc/vmw_vmci/vmci_guest.c | 762 1 files changed, 762 insertions(+), 0 deletions(-) create mode 100644 drivers/misc/vmw_vmci/vmci_guest.c diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c new file mode 100644 index 000..eedbe4d --- /dev/null +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -0,0 +1,762 @@ +/* + * VMware VMCI Driver + * + * Copyright (C) 2012 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vmci_common_int.h" +#include "vmci_datagram.h" +#include "vmci_doorbell.h" +#include "vmci_context.h" +#include "vmci_driver.h" +#include "vmci_event.h" + +#define VMCI_UTIL_NUM_RESOURCES 1 + +static bool vmci_disable_msi; +module_param_named(disable_msi, vmci_disable_msi, bool, 0); +MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); + +static bool vmci_disable_msix; +module_param_named(disable_msix, vmci_disable_msix, bool, 0); +MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); + +static u32 ctx_update_sub_id = VMCI_INVALID_ID; +static u32 vm_context_id = VMCI_INVALID_ID; + +struct vmci_guest_device { + struct device *dev; /* PCI device we are attached to */ + void __iomem *iobase; + + unsigned int irq; + unsigned int intr_type; + bool exclusive_vectors; + struct msix_entry msix_entries[VMCI_MAX_INTRS]; + + struct tasklet_struct datagram_tasklet; + struct tasklet_struct bm_tasklet; + + void *data_buffer; + void *notification_bitmap; +}; + +/* vmci_dev singleton device and supporting data*/ +static struct vmci_guest_device *vmci_dev_g; +static DEFINE_SPINLOCK(vmci_dev_spinlock); + +static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0); + +bool vmci_guest_code_active(void) +{ + return atomic_read(&vmci_num_guest_devices) != 0; +} + +u32 vmci_get_vm_context_id(void) +{ + if (vm_context_id == VMCI_INVALID_ID) { + u32 result; + struct vmci_datagram get_cid_msg; + get_cid_msg.dst = + vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID, +VMCI_GET_CONTEXT_ID); + get_cid_msg.src = VMCI_ANON_SRC_HANDLE; + get_cid_msg.payload_size = 0; + result = vmci_send_datagram(&get_cid_msg); + if (result >= 0) + vm_context_id = result; + } + return vm_context_id; +} + +/* + * VM to hypervisor call mechanism. We use the standard VMware naming + * convention since shared code is calling this function as well. + */ +int vmci_send_datagram(struct vmci_datagram *dg) +{ + unsigned long flags; + int result; + + /* Check args. */ + if (dg == NULL) + return VMCI_ERROR_INVALID_ARGS; + + /* +* Need to acquire spinlock on the device because the datagram +* data may be spread over multiple pages and the monitor may +* interleave device user rpc calls from multiple +* VCPUs. Acquiring the spinlock precludes that +* possibility. Disabling interrupts to avoid incoming +* datagrams during a "rep out" and possibly landing up in +* this function. +*/ + spin_lock_irqsave(&vmci_dev_spinlock, flags); + + if (vmci_dev_g) { + iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR, +dg, VMCI_DG_SIZE(dg)); + result = ioread32(vmci_dev_g->iobase + VMCI_RESULT_LOW_ADDR); + } else { + result = VMCI_ERROR_UNAVAILABLE; + } + + spin_unlock_irqrestore(&vmci_dev_spinlock, flags); + + return result; +} +EXPORT_SYMBOL_GPL(vmci_send_datagram); + +/* + * Gets called with the new context id if updated or resumed. + * Context id. + */ +static void vmci_guest_cid_update(u32 sub_id, + const struct vmci_event_data *event_data, + void *client_data) +{ + const struct vmci_event_payld_ctx *ev_payload = + vmci_event_data_const_payload(event_data); + + if (sub_id != ctx_update_sub_id) { + pr_devel("Invalid subscriber (ID=0x%x).\n", sub_id); + return; + } + + if (!even
[PATCH 10/12] VMCI: guest side driver implementation.
VMCI guest side driver code implementation. Signed-off-by: George Zhang --- drivers/misc/vmw_vmci/vmci_guest.c | 765 1 files changed, 765 insertions(+), 0 deletions(-) create mode 100644 drivers/misc/vmw_vmci/vmci_guest.c diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c new file mode 100644 index 000..23f5e9e --- /dev/null +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -0,0 +1,765 @@ +/* + * VMware VMCI Driver + * + * Copyright (C) 2012 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 and no later version. + * + * This program is distributed in the hope that 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vmci_common_int.h" +#include "vmci_datagram.h" +#include "vmci_doorbell.h" +#include "vmci_context.h" +#include "vmci_driver.h" +#include "vmci_event.h" + +#define VMCI_UTIL_NUM_RESOURCES 1 + +static bool vmci_disable_msi; +module_param_named(disable_msi, vmci_disable_msi, bool, 0); +MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)"); + +static bool vmci_disable_msix; +module_param_named(disable_msix, vmci_disable_msix, bool, 0); +MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); + +static u32 ctx_update_sub_id = VMCI_INVALID_ID; +static u32 vm_context_id = VMCI_INVALID_ID; + +struct vmci_guest_device { + struct device *dev; /* PCI device we are attached to */ + void __iomem *iobase; + + unsigned int irq; + unsigned int intr_type; + bool exclusive_vectors; + struct msix_entry msix_entries[VMCI_MAX_INTRS]; + + struct tasklet_struct datagram_tasklet; + struct tasklet_struct bm_tasklet; + + void *data_buffer; + void *notification_bitmap; +}; + +/* vmci_dev singleton device and supporting data*/ +static struct vmci_guest_device *vmci_dev_g; +static DEFINE_SPINLOCK(vmci_dev_spinlock); + +static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0); + +bool vmci_guest_code_active(void) +{ + return atomic_read(&vmci_num_guest_devices) != 0; +} + +u32 vmci_get_vm_context_id(void) +{ + if (vm_context_id == VMCI_INVALID_ID) { + u32 result; + struct vmci_datagram get_cid_msg; + get_cid_msg.dst = + vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID, +VMCI_GET_CONTEXT_ID); + get_cid_msg.src = VMCI_ANON_SRC_HANDLE; + get_cid_msg.payload_size = 0; + result = vmci_send_datagram(&get_cid_msg); + if (result >= 0) + vm_context_id = result; + } + return vm_context_id; +} + +/* + * VM to hypervisor call mechanism. We use the standard VMware naming + * convention since shared code is calling this function as well. + */ +int vmci_send_datagram(struct vmci_datagram *dg) +{ + unsigned long flags; + int result; + + /* Check args. */ + if (dg == NULL) + return VMCI_ERROR_INVALID_ARGS; + + /* +* Need to acquire spinlock on the device because the datagram +* data may be spread over multiple pages and the monitor may +* interleave device user rpc calls from multiple +* VCPUs. Acquiring the spinlock precludes that +* possibility. Disabling interrupts to avoid incoming +* datagrams during a "rep out" and possibly landing up in +* this function. +*/ + spin_lock_irqsave(&vmci_dev_spinlock, flags); + + if (vmci_dev_g) { + iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR, +dg, VMCI_DG_SIZE(dg)); + result = ioread32(vmci_dev_g->iobase + VMCI_RESULT_LOW_ADDR); + } else { + result = VMCI_ERROR_UNAVAILABLE; + } + + spin_unlock_irqrestore(&vmci_dev_spinlock, flags); + + return result; +} +EXPORT_SYMBOL_GPL(vmci_send_datagram); + +/* + * Gets called with the new context id if updated or resumed. + * Context id. + */ +static void vmci_guest_cid_update(u32 sub_id, + const struct vmci_event_data *event_data, + void *client_data) +{ + const struct vmci_event_payld_ctx *ev_payload = + vmci_event_data_const_payload(event_data); + + if (sub_id != ctx_update_sub_id) { + pr_devel("Invalid subscriber (ID=0x%x).\n", sub_id); + return; + } + + if (!even