vfio: make vfio run on s390

add Kconfig switch to hide INTx
add Kconfig switch to let vfio announce PCI BARs are not mapable

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

4 files changed, 19 insertions, 3 deletions

diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
index d8c57636b9ce..b93c25901e89 100644
--- a/drivers/vfio/Kconfig
+++ b/drivers/vfio/Kconfig
@@ -16,7 +16,7 @@ config VFIO_SPAPR_EEH
 menuconfig VFIO
         tristate "VFIO Non-Privileged userspace driver framework"
         depends on IOMMU_API
-        select VFIO_IOMMU_TYPE1 if X86
+        select VFIO_IOMMU_TYPE1 if (X86 || S390)
         select VFIO_IOMMU_SPAPR_TCE if (PPC_POWERNV || PPC_PSERIES)
         select VFIO_SPAPR_EEH if (PPC_POWERNV || PPC_PSERIES)
         select ANON_INODES
diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index c41b01e2b693..c6bb5da2d2a7 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -16,3 +16,11 @@ config VFIO_PCI_VGA
           BIOS and generic video drivers.
 
           If you don't know what to do here, say N.
+
+config VFIO_PCI_MMAP
+        depends on VFIO_PCI
+        def_bool y if !S390
+
+config VFIO_PCI_INTX
+        depends on VFIO_PCI
+        def_bool y if !S390
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 9558da3f06a0..255201f22126 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -215,7 +215,7 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
         if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
                 u8 pin;
                 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
-                if (pin)
+                if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && pin)
                         return 1;
 
         } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
@@ -406,7 +406,8 @@ static long vfio_pci_ioctl(void *device_data,
 
                         info.flags = VFIO_REGION_INFO_FLAG_READ |
                                      VFIO_REGION_INFO_FLAG_WRITE;
-                        if (pci_resource_flags(pdev, info.index) &
+                        if (IS_ENABLED(CONFIG_VFIO_PCI_MMAP) &&
+                            pci_resource_flags(pdev, info.index) &
                             IORESOURCE_MEM && info.size >= PAGE_SIZE)
                                 info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
                         break;
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index 1de3f94aa7de..ff75ca31a199 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -609,6 +609,10 @@ static int __init init_pci_cap_basic_perm(struct perm_bits *perm)
 
         /* Sometimes used by sw, just virtualize */
         p_setb(perm, PCI_INTERRUPT_LINE, (u8)ALL_VIRT, (u8)ALL_WRITE);
+
+        /* Virtualize interrupt pin to allow hiding INTx */
+        p_setb(perm, PCI_INTERRUPT_PIN, (u8)ALL_VIRT, (u8)NO_WRITE);
+
         return 0;
 }
 
@@ -1445,6 +1449,9 @@ int vfio_config_init(struct vfio_pci_device *vdev)
                 *(__le16 *)&vconfig[PCI_DEVICE_ID] = cpu_to_le16(pdev->device);
         }
 
+        if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX))
+                vconfig[PCI_INTERRUPT_PIN] = 0;
+
         ret = vfio_cap_init(vdev);
         if (ret)
                 goto out;