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The location of the devicetree in the guest's virtual memory can be declared via the SET_DTB_CONFIG ioctl. - Trigger start of the virtual machine with VM_START ioctl. Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman Reviewed-by: Srinivas Kandagatla --- drivers/virt/gunyah/vm_mgr.c | 243 ++++++++++++++++++++++++++++++-- drivers/virt/gunyah/vm_mgr.h | 10 ++ drivers/virt/gunyah/vm_mgr_mm.c | 23 +++ include/linux/gunyah_rsc_mgr.h | 6 + include/uapi/linux/gunyah.h | 13 ++ 5 files changed, 282 insertions(+), 13 deletions(-) diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c index e950274c6a53..299b9bb81edc 100644 --- a/drivers/virt/gunyah/vm_mgr.c +++ b/drivers/virt/gunyah/vm_mgr.c @@ -9,37 +9,118 @@ #include #include #include +#include #include #include #include "vm_mgr.h" +static int gh_vm_rm_notification_status(struct gh_vm *ghvm, void *data) +{ + struct gh_rm_vm_status_payload *payload = data; + + if (payload->vmid != ghvm->vmid) + return NOTIFY_OK; + + /* All other state transitions are synchronous to a corresponding RM call */ + if (payload->vm_status == GH_RM_VM_STATUS_RESET) { + down_write(&ghvm->status_lock); + ghvm->vm_status = payload->vm_status; + up_write(&ghvm->status_lock); + wake_up(&ghvm->vm_status_wait); + } + + return NOTIFY_DONE; +} + +static int gh_vm_rm_notification_exited(struct gh_vm *ghvm, void *data) +{ + struct gh_rm_vm_exited_payload *payload = data; + + if (payload->vmid != ghvm->vmid) + return NOTIFY_OK; + + down_write(&ghvm->status_lock); + ghvm->vm_status = GH_RM_VM_STATUS_EXITED; + up_write(&ghvm->status_lock); + + return NOTIFY_DONE; +} + +static int gh_vm_rm_notification(struct notifier_block *nb, unsigned long action, void *data) +{ + struct gh_vm *ghvm = container_of(nb, struct gh_vm, nb); + + switch (action) { + case GH_RM_NOTIFICATION_VM_STATUS: + return gh_vm_rm_notification_status(ghvm, data); + case GH_RM_NOTIFICATION_VM_EXITED: + return gh_vm_rm_notification_exited(ghvm, data); + default: + return NOTIFY_OK; + } +} + +static void gh_vm_stop(struct gh_vm *ghvm) +{ + int ret; + + down_write(&ghvm->status_lock); + if (ghvm->vm_status == GH_RM_VM_STATUS_RUNNING) { + ret = gh_rm_vm_stop(ghvm->rm, ghvm->vmid); + if (ret) + dev_warn(ghvm->parent, "Failed to stop VM: %d\n", ret); + } + + ghvm->vm_status = GH_RM_VM_STATUS_EXITED; + up_write(&ghvm->status_lock); +} + static void gh_vm_free(struct work_struct *work) { struct gh_vm *ghvm = container_of(work, struct gh_vm, free_work); struct gh_vm_mem *mapping, *tmp; int ret; - mutex_lock(&ghvm->mm_lock); - list_for_each_entry_safe(mapping, tmp, &ghvm->memory_mappings, list) { - gh_vm_mem_reclaim(ghvm, mapping); - kfree(mapping); - } - mutex_unlock(&ghvm->mm_lock); - - ret = gh_rm_dealloc_vmid(ghvm->rm, ghvm->vmid); - if (ret) - pr_warn("Failed to deallocate vmid: %d\n", ret); + switch (ghvm->vm_status) { + case GH_RM_VM_STATUS_RUNNING: + gh_vm_stop(ghvm); + fallthrough; + case GH_RM_VM_STATUS_INIT_FAILED: + case GH_RM_VM_STATUS_LOAD: + case GH_RM_VM_STATUS_EXITED: + mutex_lock(&ghvm->mm_lock); + list_for_each_entry_safe(mapping, tmp, &ghvm->memory_mappings, list) { + gh_vm_mem_reclaim(ghvm, mapping); + kfree(mapping); + } + mutex_unlock(&ghvm->mm_lock); + fallthrough; + case GH_RM_VM_STATUS_NO_STATE: + ret = gh_rm_dealloc_vmid(ghvm->rm, ghvm->vmid); + if (ret) + dev_warn(ghvm->parent, "Failed to deallocate vmid: %d\n", ret); + + gh_rm_notifier_unregister(ghvm->rm, &ghvm->nb); + gh_rm_put(ghvm->rm); + kfree(ghvm); + break; + default: + dev_err(ghvm->parent, "VM is unknown state: %d. VM will not be cleaned up.\n", + ghvm->vm_status); - put_gh_rm(ghvm->rm); - kfree(ghvm); + gh_rm_notifier_unregister(ghvm->rm, &ghvm->nb); + gh_rm_put(ghvm->rm); + kfree(ghvm); + break; + } } static __must_check struct gh_vm *gh_vm_alloc(struct gh_rm *rm) { struct gh_vm *ghvm; - int vmid; + int vmid, ret; vmid = gh_rm_alloc_vmid(rm, 0); if (vmid < 0) @@ -55,13 +136,130 @@ static __must_check struct gh_vm *gh_vm_alloc(struct gh_rm *rm) ghvm->vmid = vmid; ghvm->rm = rm; + init_waitqueue_head(&ghvm->vm_status_wait); + ghvm->nb.notifier_call = gh_vm_rm_notification; + ret = gh_rm_notifier_register(rm, &ghvm->nb); + if (ret) { + gh_rm_put(rm); + gh_rm_dealloc_vmid(rm, vmid); + kfree(ghvm); + return ERR_PTR(ret); + } + mutex_init(&ghvm->mm_lock); INIT_LIST_HEAD(&ghvm->memory_mappings); + init_rwsem(&ghvm->status_lock); INIT_WORK(&ghvm->free_work, gh_vm_free); + ghvm->vm_status = GH_RM_VM_STATUS_LOAD; return ghvm; } +static int gh_vm_start(struct gh_vm *ghvm) +{ + struct gh_vm_mem *mapping; + u64 dtb_offset; + u32 mem_handle; + int ret; + + down_write(&ghvm->status_lock); + if (ghvm->vm_status != GH_RM_VM_STATUS_LOAD) { + up_write(&ghvm->status_lock); + return 0; + } + + ghvm->vm_status = GH_RM_VM_STATUS_RESET; + + mutex_lock(&ghvm->mm_lock); + list_for_each_entry(mapping, &ghvm->memory_mappings, list) { + switch (mapping->share_type) { + case VM_MEM_LEND: + ret = gh_rm_mem_lend(ghvm->rm, &mapping->parcel); + break; + case VM_MEM_SHARE: + ret = gh_rm_mem_share(ghvm->rm, &mapping->parcel); + break; + } + if (ret) { + dev_warn(ghvm->parent, "Failed to %s parcel %d: %d\n", + mapping->share_type == VM_MEM_LEND ? "lend" : "share", + mapping->parcel.label, + ret); + goto err; + } + } + mutex_unlock(&ghvm->mm_lock); + + mapping = gh_vm_mem_find_by_addr(ghvm, ghvm->dtb_config.guest_phys_addr, + ghvm->dtb_config.size); + if (!mapping) { + dev_warn(ghvm->parent, "Failed to find the memory_handle for DTB\n"); + ret = -EINVAL; + goto err; + } + + mem_handle = mapping->parcel.mem_handle; + dtb_offset = ghvm->dtb_config.guest_phys_addr - mapping->guest_phys_addr; + + ret = gh_rm_vm_configure(ghvm->rm, ghvm->vmid, ghvm->auth, mem_handle, + 0, 0, dtb_offset, ghvm->dtb_config.size); + if (ret) { + dev_warn(ghvm->parent, "Failed to configure VM: %d\n", ret); + goto err; + } + + ret = gh_rm_vm_init(ghvm->rm, ghvm->vmid); + if (ret) { + dev_warn(ghvm->parent, "Failed to initialize VM: %d\n", ret); + goto err; + } + + ret = gh_rm_vm_start(ghvm->rm, ghvm->vmid); + if (ret) { + dev_warn(ghvm->parent, "Failed to start VM: %d\n", ret); + goto err; + } + + ghvm->vm_status = GH_RM_VM_STATUS_RUNNING; + up_write(&ghvm->status_lock); + return ret; +err: + ghvm->vm_status = GH_RM_VM_STATUS_INIT_FAILED; + /* gh_vm_free will handle releasing resources and reclaiming memory */ + up_write(&ghvm->status_lock); + return ret; +} + +static int gh_vm_ensure_started(struct gh_vm *ghvm) +{ + int ret; + + ret = down_read_interruptible(&ghvm->status_lock); + if (ret) + return ret; + + /* Unlikely because VM is typically started */ + if (unlikely(ghvm->vm_status == GH_RM_VM_STATUS_LOAD)) { + up_read(&ghvm->status_lock); + ret = gh_vm_start(ghvm); + if (ret) + goto out; + /** gh_vm_start() is guaranteed to bring status out of + * GH_RM_VM_STATUS_LOAD, thus inifitely recursive call is not + * possible + */ + return gh_vm_ensure_started(ghvm); + } + + /* Unlikely because VM is typically running */ + if (unlikely(ghvm->vm_status != GH_RM_VM_STATUS_RUNNING)) + ret = -ENODEV; + +out: + up_read(&ghvm->status_lock); + return ret; +} + static long gh_vm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct gh_vm *ghvm = filp->private_data; @@ -85,6 +283,25 @@ static long gh_vm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) r = gh_vm_mem_alloc(ghvm, ®ion); break; } + case GH_VM_SET_DTB_CONFIG: { + struct gh_vm_dtb_config dtb_config; + + if (copy_from_user(&dtb_config, argp, sizeof(dtb_config))) + return -EFAULT; + + dtb_config.size = PAGE_ALIGN(dtb_config.size); + if (dtb_config.guest_phys_addr + dtb_config.size < dtb_config.guest_phys_addr) + return -EOVERFLOW; + + ghvm->dtb_config = dtb_config; + + r = 0; + break; + } + case GH_VM_START: { + r = gh_vm_ensure_started(ghvm); + break; + } default: r = -ENOTTY; break; diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index c9f6fa5478ed..26bcc2ae4478 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -10,6 +10,8 @@ #include #include #include +#include +#include #include @@ -34,6 +36,13 @@ struct gh_vm { u16 vmid; struct gh_rm *rm; struct device *parent; + enum gh_rm_vm_auth_mechanism auth; + struct gh_vm_dtb_config dtb_config; + + struct notifier_block nb; + enum gh_rm_vm_status vm_status; + wait_queue_head_t vm_status_wait; + struct rw_semaphore status_lock; struct work_struct free_work; struct mutex mm_lock; @@ -44,5 +53,6 @@ int gh_vm_mem_alloc(struct gh_vm *ghvm, struct gh_userspace_memory_region *regio void gh_vm_mem_reclaim(struct gh_vm *ghvm, struct gh_vm_mem *mapping); int gh_vm_mem_free(struct gh_vm *ghvm, u32 label); struct gh_vm_mem *gh_vm_mem_find_by_label(struct gh_vm *ghvm, u32 label); +struct gh_vm_mem *gh_vm_mem_find_by_addr(struct gh_vm *ghvm, u64 guest_phys_addr, u32 size); #endif diff --git a/drivers/virt/gunyah/vm_mgr_mm.c b/drivers/virt/gunyah/vm_mgr_mm.c index db6f55cef37f..6e1d2e8bddb7 100644 --- a/drivers/virt/gunyah/vm_mgr_mm.c +++ b/drivers/virt/gunyah/vm_mgr_mm.c @@ -47,6 +47,29 @@ void gh_vm_mem_reclaim(struct gh_vm *ghvm, struct gh_vm_mem *mapping) list_del(&mapping->list); } +struct gh_vm_mem *gh_vm_mem_find_by_addr(struct gh_vm *ghvm, u64 guest_phys_addr, u32 size) +{ + struct gh_vm_mem *mapping = NULL; + int ret; + + ret = mutex_lock_interruptible(&ghvm->mm_lock); + if (ret) + return ERR_PTR(ret); + + list_for_each_entry(mapping, &ghvm->memory_mappings, list) { + if (guest_phys_addr >= mapping->guest_phys_addr && + (guest_phys_addr + size <= mapping->guest_phys_addr + + (mapping->npages << PAGE_SHIFT))) { + goto unlock; + } + } + + mapping = NULL; +unlock: + mutex_unlock(&ghvm->mm_lock); + return mapping; +} + struct gh_vm_mem *gh_vm_mem_find_by_label(struct gh_vm *ghvm, u32 label) { struct gh_vm_mem *mapping; diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h index 88a429dad09e..8b0b46f28e39 100644 --- a/include/linux/gunyah_rsc_mgr.h +++ b/include/linux/gunyah_rsc_mgr.h @@ -29,6 +29,12 @@ struct gh_rm_vm_exited_payload { #define GH_RM_NOTIFICATION_VM_EXITED 0x56100001 enum gh_rm_vm_status { + /** + * RM doesn't have a state where load partially failed because + * only Linux + */ + GH_RM_VM_STATUS_LOAD_FAILED = -1, + GH_RM_VM_STATUS_NO_STATE = 0, GH_RM_VM_STATUS_INIT = 1, GH_RM_VM_STATUS_READY = 2, diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h index a19207e3e065..d6abd8605a2e 100644 --- a/include/uapi/linux/gunyah.h +++ b/include/uapi/linux/gunyah.h @@ -49,4 +49,17 @@ struct gh_userspace_memory_region { #define GH_VM_SET_USER_MEM_REGION _IOW(GH_IOCTL_TYPE, 0x1, \ struct gh_userspace_memory_region) +/** + * struct gh_vm_dtb_config - Set the location of the VM's devicetree blob + * @guest_phys_addr: Address of the VM's devicetree in guest memory. + * @size: Maximum size of the devicetree. + */ +struct gh_vm_dtb_config { + __u64 guest_phys_addr; + __u64 size; +}; +#define GH_VM_SET_DTB_CONFIG _IOW(GH_IOCTL_TYPE, 0x2, struct gh_vm_dtb_config) + +#define GH_VM_START _IO(GH_IOCTL_TYPE, 0x3) + #endif