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The ACRN hypervisor has scenarios which could run a real-time guest VM.
The real-time guest VM occupies dedicated CPU cores, be assigned with
dedicated PCI devices. It can run without the Service VM after boot up.
hcall_destroy_vm() returns failure when a real-time guest VM refuses.
The clearing of flag ACRN_VM_FLAG_DESTROYED causes some kernel resource
double-freed in a later acrn_vm_destroy().
Do hcall_destroy_vm() before resource release to drop this chance to
destroy the VM if hypercall fails.
Fixes: 9c5137aedd ("virt: acrn: Introduce VM management interfaces")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Signed-off-by: Fei Li <fei1.li@intel.com>
Link: https://lore.kernel.org/r/20210722062736.15050-1-fei1.li@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ACRN_HSM: Virtual Machine management
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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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* Yakui Zhao <yakui.zhao@intel.com>
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*/
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include "acrn_drv.h"
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/* List of VMs */
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LIST_HEAD(acrn_vm_list);
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/*
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* acrn_vm_list is read in a worker thread which dispatch I/O requests and
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* is wrote in VM creation ioctl. Use the rwlock mechanism to protect it.
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*/
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DEFINE_RWLOCK(acrn_vm_list_lock);
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struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
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struct acrn_vm_creation *vm_param)
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{
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int ret;
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ret = hcall_create_vm(virt_to_phys(vm_param));
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if (ret < 0 || vm_param->vmid == ACRN_INVALID_VMID) {
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dev_err(acrn_dev.this_device,
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"Failed to create VM! Error: %d\n", ret);
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return NULL;
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}
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mutex_init(&vm->regions_mapping_lock);
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INIT_LIST_HEAD(&vm->ioreq_clients);
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spin_lock_init(&vm->ioreq_clients_lock);
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vm->vmid = vm_param->vmid;
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vm->vcpu_num = vm_param->vcpu_num;
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if (acrn_ioreq_init(vm, vm_param->ioreq_buf) < 0) {
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hcall_destroy_vm(vm_param->vmid);
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vm->vmid = ACRN_INVALID_VMID;
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return NULL;
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}
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write_lock_bh(&acrn_vm_list_lock);
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list_add(&vm->list, &acrn_vm_list);
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write_unlock_bh(&acrn_vm_list_lock);
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acrn_ioeventfd_init(vm);
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acrn_irqfd_init(vm);
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dev_dbg(acrn_dev.this_device, "VM %u created.\n", vm->vmid);
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return vm;
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}
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int acrn_vm_destroy(struct acrn_vm *vm)
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{
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int ret;
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if (vm->vmid == ACRN_INVALID_VMID ||
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test_and_set_bit(ACRN_VM_FLAG_DESTROYED, &vm->flags))
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return 0;
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ret = hcall_destroy_vm(vm->vmid);
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if (ret < 0) {
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dev_err(acrn_dev.this_device,
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"Failed to destroy VM %u\n", vm->vmid);
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clear_bit(ACRN_VM_FLAG_DESTROYED, &vm->flags);
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return ret;
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}
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/* Remove from global VM list */
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write_lock_bh(&acrn_vm_list_lock);
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list_del_init(&vm->list);
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write_unlock_bh(&acrn_vm_list_lock);
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acrn_ioeventfd_deinit(vm);
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acrn_irqfd_deinit(vm);
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acrn_ioreq_deinit(vm);
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if (vm->monitor_page) {
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put_page(vm->monitor_page);
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vm->monitor_page = NULL;
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}
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acrn_vm_all_ram_unmap(vm);
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dev_dbg(acrn_dev.this_device, "VM %u destroyed.\n", vm->vmid);
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vm->vmid = ACRN_INVALID_VMID;
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return 0;
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}
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/**
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* acrn_msi_inject() - Inject a MSI interrupt into a User VM
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* @vm: User VM
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* @msi_addr: The MSI address
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* @msi_data: The MSI data
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*
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* Return: 0 on success, <0 on error
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*/
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int acrn_msi_inject(struct acrn_vm *vm, u64 msi_addr, u64 msi_data)
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{
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struct acrn_msi_entry *msi;
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int ret;
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/* might be used in interrupt context, so use GFP_ATOMIC */
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msi = kzalloc(sizeof(*msi), GFP_ATOMIC);
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if (!msi)
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return -ENOMEM;
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/*
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* msi_addr: addr[19:12] with dest vcpu id
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* msi_data: data[7:0] with vector
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*/
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msi->msi_addr = msi_addr;
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msi->msi_data = msi_data;
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ret = hcall_inject_msi(vm->vmid, virt_to_phys(msi));
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if (ret < 0)
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dev_err(acrn_dev.this_device,
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"Failed to inject MSI to VM %u!\n", vm->vmid);
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kfree(msi);
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return ret;
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}
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