[PATCH v3 2/8] KVM: add PCI MSI hypercall for VFIO passthrough

[kernel test robot]

Hi Jose,

kernel test robot noticed the following build errors:

[auto build test ERROR on pci/next]
[also build test ERROR on pci/for-linus linus/master next-20261030]
[cannot apply to kvm/queue kvm/next ath/ath-next kvm/linux-next v7.3]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jose-Ignacio-Tornos-Martinez/vfio-add-helper-to-find-PCI-device-by-vendor-device-ID/20261029-173706
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20261029163713.1366077-3-jtornosm%40redhat.com
patch subject: [PATCH v3 2/8] KVM: add PCI MSI hypercall for VFIO passthrough
config: s390-randconfig-1000-20261031 (https://download.01.org/0day-ci/archive/20261031/202610311038.ydvb3F1w-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261031/202610311038.ydvb3F1w-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610311038.ydvb3F1w-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/s390/kvm/arm64/../../../../virt/kvm/vfio.c: In function 'kvm_vfio_pci_msi_alloc':
>> arch/s390/kvm/arm64/../../../../virt/kvm/vfio.c:438:48: error: 'struct irq_data' has no member named 'parent_data'
     438 |                 for (pos = irqd; pos; pos = pos->parent_data) {
         |                                                ^~
--
   arch/s390/kvm/s390/../../../../virt/kvm/vfio.c: In function 'kvm_vfio_pci_msi_alloc':
>> arch/s390/kvm/s390/../../../../virt/kvm/vfio.c:438:48: error: 'struct irq_data' has no member named 'parent_data'
     438 |                 for (pos = irqd; pos; pos = pos->parent_data) {
         |                                                ^~


vim +438 arch/s390/kvm/arm64/../../../../virt/kvm/vfio.c

   361	
   362	/**
   363	 * kvm_vfio_pci_msi_alloc - Get physical MSI address/data for a VFIO device
   364	 * @kvm: the VM instance
   365	 * @devid: PCI vendor:device packed as (vendor << 16 | device)
   366	 * @vector: MSI vector index
   367	 * @msg: output MSI message (address + data)
   368	 *
   369	 * Walks VFIO files attached to this VM, uses vfio_file_find_pci_device()
   370	 * to find the PCI device matching the given vendor:device ID, and returns
   371	 * the host's physical MSI address/data for the requested vector.
   372	 *
   373	 * Returns 0 on success, negative errno on failure.
   374	 */
   375	int kvm_vfio_pci_msi_alloc(struct kvm *kvm, u32 devid,
   376				     unsigned int vector, struct msi_msg *msg)
   377	{
   378		struct kvm_vfio_file *kvf;
   379		struct kvm_vfio *kv = NULL;
   380		struct vfio_device *vdev;
   381		struct kvm_device *dev;
   382		struct msi_desc *desc;
   383		struct irq_data *irqd;
   384		struct pci_dev *pdev;
   385		u16 vendor = devid >> 16;
   386		u16 device = devid & 0xffff;
   387		int irq;
   388	
   389		scoped_guard(mutex, &kvm->lock) {
   390			list_for_each_entry(dev, &kvm->devices, vm_node) {
   391				if (dev->ops == &kvm_vfio_ops) {
   392					kv = dev->private;
   393					break;
   394				}
   395			}
   396		}
   397	
   398		if (!kv)
   399			return -ENODEV;
   400	
   401		guard(mutex)(&kv->lock);
   402	
   403		vdev = NULL;
   404		list_for_each_entry(kvf, &kv->file_list, node) {
   405			vdev = vfio_file_find_pci_device(kvf->file, vendor, device);
   406			if (vdev)
   407				break;
   408		}
   409	
   410		if (!vdev)
   411			return -ENODEV;
   412	
   413		pdev = to_pci_dev(vdev->dev);
   414	
   415		if (!pdev->msi_enabled && !pdev->msix_enabled) {
   416			memset(msg, 0, sizeof(*msg));
   417			return 0;
   418		}
   419	
   420		irq = pci_irq_vector(pdev, vector);
   421		if (irq <= 0) {
   422			memset(msg, 0, sizeof(*msg));
   423			return 0;
   424		}
   425	
   426		irqd = irq_get_irq_data(irq);
   427		if (!irqd) {
   428			memset(msg, 0, sizeof(*msg));
   429			return 0;
   430		}
   431	
   432		desc = irq_get_msi_desc(irq);
   433		if (desc) {
   434			*msg = desc->msg;
   435		} else {
   436			struct irq_data *pos;
   437	
 > 438			for (pos = irqd; pos; pos = pos->parent_data) {
   439				if (pos->chip && pos->chip->irq_compose_msi_msg) {
   440					pos->chip->irq_compose_msi_msg(pos, msg);
   441					break;
   442				}
   443			}
   444			if (!pos) {
   445				memset(msg, 0, sizeof(*msg));
   446				return 0;
   447			}
   448		}
   449	
   450		return 0;
   451	}
   452	

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