1 files changed, 44 insertions, 2 deletions

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index a5ab416cf476..20d7b69ea6ff 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -530,8 +530,11 @@ int vfio_pci_core_enable(struct vfio_pci_core_device *vdev)
 		vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
 		vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
 		vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
-	} else
+		vdev->has_dyn_msix = pci_msix_can_alloc_dyn(pdev);
+	} else {
 		vdev->msix_bar = 0xFF;
+		vdev->has_dyn_msix = false;
+	}
 
 	if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
 		vdev->has_vga = true;
@@ -882,6 +885,37 @@ int vfio_pci_core_register_dev_region(struct vfio_pci_core_device *vdev,
 }
 EXPORT_SYMBOL_GPL(vfio_pci_core_register_dev_region);
 
+static int vfio_pci_info_atomic_cap(struct vfio_pci_core_device *vdev,
+				    struct vfio_info_cap *caps)
+{
+	struct vfio_device_info_cap_pci_atomic_comp cap = {
+		.header.id = VFIO_DEVICE_INFO_CAP_PCI_ATOMIC_COMP,
+		.header.version = 1
+	};
+	struct pci_dev *pdev = pci_physfn(vdev->pdev);
+	u32 devcap2;
+
+	pcie_capability_read_dword(pdev, PCI_EXP_DEVCAP2, &devcap2);
+
+	if ((devcap2 & PCI_EXP_DEVCAP2_ATOMIC_COMP32) &&
+	    !pci_enable_atomic_ops_to_root(pdev, PCI_EXP_DEVCAP2_ATOMIC_COMP32))
+		cap.flags |= VFIO_PCI_ATOMIC_COMP32;
+
+	if ((devcap2 & PCI_EXP_DEVCAP2_ATOMIC_COMP64) &&
+	    !pci_enable_atomic_ops_to_root(pdev, PCI_EXP_DEVCAP2_ATOMIC_COMP64))
+		cap.flags |= VFIO_PCI_ATOMIC_COMP64;
+
+	if ((devcap2 & PCI_EXP_DEVCAP2_ATOMIC_COMP128) &&
+	    !pci_enable_atomic_ops_to_root(pdev,
+					   PCI_EXP_DEVCAP2_ATOMIC_COMP128))
+		cap.flags |= VFIO_PCI_ATOMIC_COMP128;
+
+	if (!cap.flags)
+		return -ENODEV;
+
+	return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
+}
+
 static int vfio_pci_ioctl_get_info(struct vfio_pci_core_device *vdev,
 				   struct vfio_device_info __user *arg)
 {
@@ -920,6 +954,13 @@ static int vfio_pci_ioctl_get_info(struct vfio_pci_core_device *vdev,
 		return ret;
 	}
 
+	ret = vfio_pci_info_atomic_cap(vdev, &caps);
+	if (ret && ret != -ENODEV) {
+		pci_warn(vdev->pdev,
+			 "Failed to setup AtomicOps info capability\n");
+		return ret;
+	}
+
 	if (caps.size) {
 		info.flags |= VFIO_DEVICE_FLAGS_CAPS;
 		if (info.argsz < sizeof(info) + caps.size) {
@@ -1111,7 +1152,7 @@ static int vfio_pci_ioctl_get_irq_info(struct vfio_pci_core_device *vdev,
 	if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
 		info.flags |=
 			(VFIO_IRQ_INFO_MASKABLE | VFIO_IRQ_INFO_AUTOMASKED);
-	else
+	else if (info.index != VFIO_PCI_MSIX_IRQ_INDEX || !vdev->has_dyn_msix)
 		info.flags |= VFIO_IRQ_INFO_NORESIZE;
 
 	return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
@@ -2102,6 +2143,7 @@ int vfio_pci_core_init_dev(struct vfio_device *core_vdev)
 	INIT_LIST_HEAD(&vdev->vma_list);
 	INIT_LIST_HEAD(&vdev->sriov_pfs_item);
 	init_rwsem(&vdev->memory_lock);
+	xa_init(&vdev->ctx);
 
 	return 0;
 }