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HV: restrict conditions to assign/deassign pcidev

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hv: hypercall: restrict the condition to assign/deassign a pci device to
a post-launched VM for safety

For the safety of post-launched VMs, pci devices assignments should
occur only when VM is being created (at VM_CREATED STATUS), and pci
devices de-assignment should occur only when VM is being created or
shutdown/reset (at VM_CREATED or VM_PAUSED status)

Tracked-On: #4995
Acked-by: Eddie Done <eddie.dong@intel.com>
Reviewed-by: Li Fei <Fei1.Li@intel.com>
Signed-off-by: Wang Qian <qian1.wang@intel.com>
This commit is contained in:
Qian Wang 2020-07-01 09:53:21 +08:00 committed by wenlingz
parent 2276f1c43d
commit aee4515ff0
1 changed files with 6 additions and 4 deletions
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10
hypervisor/common/hypercall.c
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@ -835,12 +835,13 @@ int32_t hcall_assign_pcidev(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
struct acrn_assign_pcidev pcidev;
struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
/* We should only assign a device to a post-launched VM at creating time for safety, not runtime or other cases*/
if (is_created_vm(target_vm) && is_postlaunched_vm(target_vm)) {
if (copy_from_gpa(vm, &pcidev, param, sizeof(pcidev)) == 0) {
ret = vpci_assign_pcidev(target_vm, &pcidev);
}
} else {
pr_err("%s, vm[%d] is invalid\n", __func__, vm->vm_id);
pr_err("%s, vm[%d] is not a postlaunched VM, or not in CREATED status to be assigned with a pcidev\n", __func__, vm->vm_id);
}
return ret;
@ -863,12 +864,13 @@ int32_t hcall_deassign_pcidev(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
struct acrn_assign_pcidev pcidev;
struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
/* We should only de-assign a device from a post-launched VM at creating/shutdown/reset time */
if ((is_paused_vm(target_vm) || is_created_vm(target_vm)) && is_postlaunched_vm(target_vm)) {
if (copy_from_gpa(vm, &pcidev, param, sizeof(pcidev)) == 0) {
ret = vpci_deassign_pcidev(target_vm, &pcidev);
}
} else {
pr_err("%s, vm[%d] is invalid\n", __func__, vm->vm_id);
pr_err("%s, vm[%d] is not a postlaunched VM, or not in PAUSED/CREATED status to be deassigned from a pcidev\n", __func__, vm->vm_id);
}
return ret;