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hv: add new hypercalls to create and destroy an emulated device in hypervisor

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Add HC_CREATE_VDEV and HC_DESTROY_VDEV two hypercalls that are used to
create and destroy an emulated device(PCI device or legacy device) in hypervisor

v3: 1) change HC_CREATE_DEVICE and HC_DESTROY_DEVICE to HC_CREATE_VDEV
       and HC_DESTROY_VDEV
    2) refine code style

v4: 1) remove unnecessary parameter
    2) add VM state check for HC_CREATE_VDEV and HC_DESTROY hypercalls

Tracked-On: #4853

Reviewed-by: Wang, Yu1 <yu1.wang@intel.com>
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Yuan Liu
2020-08-26 16:20:01 +08:00
committed by wenlingz
parent 52bb9d6983
commit 8a34cf03ca
4 changed files with 172 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

95
hypervisor/common/hypercall.c
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@@ -23,6 +23,22 @@
#define DBG_LEVEL_HYCALL 6U
typedef int32_t (*emul_dev_op) (struct acrn_vm *vm, struct acrn_emul_dev *dev);
struct emul_dev_ops {
/*
* The low 32 bits represent the vendor id and device id of PCI device,
* and the high 32 bits represent the device number of the legacy device
*/
uint64_t dev_id;
emul_dev_op create;
emul_dev_op destroy;
};
static struct emul_dev_ops emul_dev_ops_tbl[] = {
{0, NULL, NULL}, /* implemented in next patch */
};
bool is_hypercall_from_ring0(void)
{
uint16_t cs_sel;
@@ -1197,3 +1213,82 @@ int32_t hcall_set_callback_vector(__unused struct acrn_vm *vm, __unused struct a
return ret;
}
/*
* @pre dev != NULL
*/
static struct emul_dev_ops *find_emul_dev_ops(struct acrn_emul_dev *dev)
{
struct emul_dev_ops *op = NULL;
uint32_t i;
for (i = 0U; i < ARRAY_SIZE(emul_dev_ops_tbl); i++) {
if (emul_dev_ops_tbl[i].dev_id == dev->dev_id.value) {
op = &emul_dev_ops_tbl[i];
break;
}
}
return op;
}
/**
* @brief Create an emulated device in hypervisor.
*
* @param vm pointer to VM data structure
* @param vmid ID of the VM
* @param param guest physical address. This gpa points to data structure of
* acrn_emul_dev including information about PCI or legacy devices
*
* @pre Pointer vm shall point to SOS_VM
* @return 0 on success, non-zero on error.
*/
int32_t hcall_create_vdev(struct acrn_vm *vm, struct acrn_vm *target_vm, __unused uint64_t param1, uint64_t param2)
{
int32_t ret = -EINVAL;
struct acrn_emul_dev dev;
struct emul_dev_ops *op;
/* We should only create a device to a post-launched VM at creating time for safety, not runtime or other cases*/
if (is_created_vm(target_vm)) {
if (copy_from_gpa(vm, &dev, param2, sizeof(dev)) == 0) {
op = find_emul_dev_ops(&dev);
if ((op != NULL) && (op->create != NULL)) {
ret = op->create(target_vm, &dev);
}
}
} else {
pr_err("%s, vm[%d] is not a postlaunched VM, or not in CREATED status to create a vdev\n", __func__, target_vm->vm_id);
}
return ret;
}
/**
* @brief Destroy an emulated device in hypervisor.
*
* @param vm pointer to VM data structure
* @param vmid ID of the VM
* @param param guest physical address. This gpa points to data structure of
* acrn_emul_dev including information about PCI or legacy devices
*
* @pre Pointer vm shall point to SOS_VM
* @return 0 on success, non-zero on error.
*/
int32_t hcall_destroy_vdev(struct acrn_vm *vm, struct acrn_vm *target_vm, __unused uint64_t param1, uint64_t param2)
{
int32_t ret = -EINVAL;
struct acrn_emul_dev dev;
struct emul_dev_ops *op;
/* We should only destroy a device to a post-launched VM at creating or pausing time for safety, not runtime or other cases*/
if (is_created_vm(target_vm) || is_paused_vm(target_vm)) {
if (copy_from_gpa(vm, &dev, param2, sizeof(dev)) == 0) {
op = find_emul_dev_ops(&dev);
if ((op != NULL) && (op->destroy != NULL)) {
ret = op->destroy(target_vm, &dev);
}
}
} else {
pr_err("%s, vm[%d] is not a postlaunched VM, or not in CREATED/PAUSED status to destroy a vdev\n", __func__, target_vm->vm_id);
}
return ret;
}