VFIO updates for v4.20
- EDID interfaces for vfio devices supporting display extensions
(Gerd Hoffmann)
- Generically select Type-1 IOMMU model support on ARM/ARM64
(Geert Uytterhoeven)
- Quirk for VFs reporting INTx pin (Alex Williamson)
- Fix error path memory leak in MSI support (Li Qiang)
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Merge tag 'vfio-v4.20-rc1.v2' of git://github.com/awilliam/linux-vfio
Pull VFIO updates from Alex Williamson:
- EDID interfaces for vfio devices supporting display extensions (Gerd
Hoffmann)
- Generically select Type-1 IOMMU model support on ARM/ARM64 (Geert
Uytterhoeven)
- Quirk for VFs reporting INTx pin (Alex Williamson)
- Fix error path memory leak in MSI support (Li Qiang)
* tag 'vfio-v4.20-rc1.v2' of git://github.com/awilliam/linux-vfio:
vfio: add edid support to mbochs sample driver
vfio: add edid api for display (vgpu) devices.
drivers/vfio: Allow type-1 IOMMU instantiation with all ARM/ARM64 IOMMUs
vfio/pci: Mask buggy SR-IOV VF INTx support
vfio/pci: Fix potential memory leak in vfio_msi_cap_len
This commit is contained in:
Linus Torvalds
Коммит
0c86e761b9
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@ -21,7 +21,7 @@ config VFIO_VIRQFD
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menuconfig VFIO
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tristate "VFIO Non-Privileged userspace driver framework"
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depends on IOMMU_API
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select VFIO_IOMMU_TYPE1 if (X86 || S390 || ARM_SMMU || ARM_SMMU_V3)
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select VFIO_IOMMU_TYPE1 if (X86 || S390 || ARM || ARM64)
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select ANON_INODES
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help
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VFIO provides a framework for secure userspace device drivers.
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@ -434,10 +434,14 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
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{
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if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
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u8 pin;
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pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
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if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && !vdev->nointx && pin)
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return 1;
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if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
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vdev->nointx || vdev->pdev->is_virtfn)
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return 0;
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pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
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return pin ? 1 : 0;
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} else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
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u8 pos;
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u16 flags;
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@ -1180,8 +1180,10 @@ static int vfio_msi_cap_len(struct vfio_pci_device *vdev, u8 pos)
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return -ENOMEM;
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ret = init_pci_cap_msi_perm(vdev->msi_perm, len, flags);
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if (ret)
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if (ret) {
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kfree(vdev->msi_perm);
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return ret;
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}
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return len;
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}
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@ -1609,6 +1611,15 @@ static int vfio_ecap_init(struct vfio_pci_device *vdev)
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return 0;
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}
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/*
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* Nag about hardware bugs, hopefully to have vendors fix them, but at least
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* to collect a list of dependencies for the VF INTx pin quirk below.
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*/
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static const struct pci_device_id known_bogus_vf_intx_pin[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x270c) },
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{}
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};
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/*
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* For each device we allocate a pci_config_map that indicates the
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* capability occupying each dword and thus the struct perm_bits we
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@ -1674,6 +1685,24 @@ int vfio_config_init(struct vfio_pci_device *vdev)
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if (pdev->is_virtfn) {
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*(__le16 *)&vconfig[PCI_VENDOR_ID] = cpu_to_le16(pdev->vendor);
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*(__le16 *)&vconfig[PCI_DEVICE_ID] = cpu_to_le16(pdev->device);
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/*
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* Per SR-IOV spec rev 1.1, 3.4.1.18 the interrupt pin register
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* does not apply to VFs and VFs must implement this register
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* as read-only with value zero. Userspace is not readily able
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* to identify whether a device is a VF and thus that the pin
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* definition on the device is bogus should it violate this
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* requirement. We already virtualize the pin register for
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* other purposes, so we simply need to replace the bogus value
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* and consider VFs when we determine INTx IRQ count.
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*/
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if (vconfig[PCI_INTERRUPT_PIN] &&
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!pci_match_id(known_bogus_vf_intx_pin, pdev))
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pci_warn(pdev,
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"Hardware bug: VF reports bogus INTx pin %d\n",
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vconfig[PCI_INTERRUPT_PIN]);
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vconfig[PCI_INTERRUPT_PIN] = 0; /* Gratuitous for good VFs */
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}
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if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) || vdev->nointx)
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@ -303,6 +303,56 @@ struct vfio_region_info_cap_type {
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#define VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG (2)
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#define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG (3)
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#define VFIO_REGION_TYPE_GFX (1)
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#define VFIO_REGION_SUBTYPE_GFX_EDID (1)
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/**
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* struct vfio_region_gfx_edid - EDID region layout.
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*
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* Set display link state and EDID blob.
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*
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* The EDID blob has monitor information such as brand, name, serial
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* number, physical size, supported video modes and more.
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*
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* This special region allows userspace (typically qemu) set a virtual
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* EDID for the virtual monitor, which allows a flexible display
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* configuration.
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*
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* For the edid blob spec look here:
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* https://en.wikipedia.org/wiki/Extended_Display_Identification_Data
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*
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* On linux systems you can find the EDID blob in sysfs:
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* /sys/class/drm/${card}/${connector}/edid
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*
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* You can use the edid-decode ulility (comes with xorg-x11-utils) to
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* decode the EDID blob.
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*
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* @edid_offset: location of the edid blob, relative to the
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* start of the region (readonly).
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* @edid_max_size: max size of the edid blob (readonly).
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* @edid_size: actual edid size (read/write).
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* @link_state: display link state (read/write).
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* VFIO_DEVICE_GFX_LINK_STATE_UP: Monitor is turned on.
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* VFIO_DEVICE_GFX_LINK_STATE_DOWN: Monitor is turned off.
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* @max_xres: max display width (0 == no limitation, readonly).
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* @max_yres: max display height (0 == no limitation, readonly).
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*
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* EDID update protocol:
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* (1) set link-state to down.
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* (2) update edid blob and size.
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* (3) set link-state to up.
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*/
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struct vfio_region_gfx_edid {
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__u32 edid_offset;
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__u32 edid_max_size;
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__u32 edid_size;
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__u32 max_xres;
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__u32 max_yres;
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__u32 link_state;
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#define VFIO_DEVICE_GFX_LINK_STATE_UP 1
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#define VFIO_DEVICE_GFX_LINK_STATE_DOWN 2
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};
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/*
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* The MSIX mappable capability informs that MSIX data of a BAR can be mmapped
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* which allows direct access to non-MSIX registers which happened to be within
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@ -71,11 +71,19 @@
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#define MBOCHS_NAME "mbochs"
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#define MBOCHS_CLASS_NAME "mbochs"
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#define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS
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#define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1)
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#define MBOCHS_CONFIG_SPACE_SIZE 0xff
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#define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE
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#define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE
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#define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
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#define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
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MBOCHS_MMIO_BAR_SIZE)
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#define MBOCHS_EDID_SIZE PAGE_SIZE
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#define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \
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MBOCHS_EDID_SIZE)
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#define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2)
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#define STORE_LE16(addr, val) (*(u16 *)addr = val)
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#define STORE_LE32(addr, val) (*(u32 *)addr = val)
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@ -95,16 +103,24 @@ MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
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static const struct mbochs_type {
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const char *name;
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u32 mbytes;
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u32 max_x;
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u32 max_y;
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} mbochs_types[] = {
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{
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.name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
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.mbytes = 4,
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.max_x = 800,
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.max_y = 600,
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}, {
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.name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
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.mbytes = 16,
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.max_x = 1920,
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.max_y = 1440,
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}, {
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.name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
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.mbytes = 64,
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.max_x = 0,
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.max_y = 0,
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},
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};
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@ -115,6 +131,11 @@ static struct cdev mbochs_cdev;
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static struct device mbochs_dev;
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static int mbochs_used_mbytes;
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struct vfio_region_info_ext {
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struct vfio_region_info base;
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struct vfio_region_info_cap_type type;
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};
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struct mbochs_mode {
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u32 drm_format;
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u32 bytepp;
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@ -144,13 +165,14 @@ struct mdev_state {
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u32 memory_bar_mask;
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struct mutex ops_lock;
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struct mdev_device *mdev;
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struct vfio_device_info dev_info;
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const struct mbochs_type *type;
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u16 vbe[VBE_DISPI_INDEX_COUNT];
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u64 memsize;
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struct page **pages;
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pgoff_t pagecount;
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struct vfio_region_gfx_edid edid_regs;
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u8 edid_blob[0x400];
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struct list_head dmabufs;
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u32 active_id;
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@ -342,10 +364,20 @@ static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
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char *buf, u32 count)
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{
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struct device *dev = mdev_dev(mdev_state->mdev);
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struct vfio_region_gfx_edid *edid;
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u16 reg16 = 0;
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int index;
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switch (offset) {
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case 0x000 ... 0x3ff: /* edid block */
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edid = &mdev_state->edid_regs;
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if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP ||
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offset >= edid->edid_size) {
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memset(buf, 0, count);
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break;
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}
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memcpy(buf, mdev_state->edid_blob + offset, count);
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break;
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case 0x500 ... 0x515: /* bochs dispi interface */
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if (count != 2)
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goto unhandled;
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@ -365,6 +397,44 @@ unhandled:
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}
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}
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static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset,
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char *buf, u32 count, bool is_write)
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{
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char *regs = (void *)&mdev_state->edid_regs;
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if (offset + count > sizeof(mdev_state->edid_regs))
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return;
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if (count != 4)
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return;
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if (offset % 4)
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return;
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if (is_write) {
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switch (offset) {
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case offsetof(struct vfio_region_gfx_edid, link_state):
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case offsetof(struct vfio_region_gfx_edid, edid_size):
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memcpy(regs + offset, buf, count);
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break;
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default:
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/* read-only regs */
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break;
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}
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} else {
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memcpy(buf, regs + offset, count);
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}
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}
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static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
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char *buf, u32 count, bool is_write)
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{
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if (offset + count > mdev_state->edid_regs.edid_max_size)
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return;
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if (is_write)
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memcpy(mdev_state->edid_blob + offset, buf, count);
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else
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memcpy(buf, mdev_state->edid_blob + offset, count);
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}
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static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
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loff_t pos, bool is_write)
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{
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|
|
@ -384,13 +454,25 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
|
|||
memcpy(buf, (mdev_state->vconfig + pos), count);
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|
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} else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
|
||||
pos + count <= MBOCHS_MEMORY_BAR_OFFSET) {
|
||||
pos + count <= (MBOCHS_MMIO_BAR_OFFSET +
|
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MBOCHS_MMIO_BAR_SIZE)) {
|
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pos -= MBOCHS_MMIO_BAR_OFFSET;
|
||||
if (is_write)
|
||||
handle_mmio_write(mdev_state, pos, buf, count);
|
||||
else
|
||||
handle_mmio_read(mdev_state, pos, buf, count);
|
||||
|
||||
} else if (pos >= MBOCHS_EDID_OFFSET &&
|
||||
pos + count <= (MBOCHS_EDID_OFFSET +
|
||||
MBOCHS_EDID_SIZE)) {
|
||||
pos -= MBOCHS_EDID_OFFSET;
|
||||
if (pos < MBOCHS_EDID_BLOB_OFFSET) {
|
||||
handle_edid_regs(mdev_state, pos, buf, count, is_write);
|
||||
} else {
|
||||
pos -= MBOCHS_EDID_BLOB_OFFSET;
|
||||
handle_edid_blob(mdev_state, pos, buf, count, is_write);
|
||||
}
|
||||
|
||||
} else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
|
||||
pos + count <=
|
||||
MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
|
||||
|
|
@ -471,6 +553,10 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
|
|||
mdev_state->next_id = 1;
|
||||
|
||||
mdev_state->type = type;
|
||||
mdev_state->edid_regs.max_xres = type->max_x;
|
||||
mdev_state->edid_regs.max_yres = type->max_y;
|
||||
mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
|
||||
mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
|
||||
mbochs_create_config_space(mdev_state);
|
||||
mbochs_reset(mdev);
|
||||
|
||||
|
|
@ -932,16 +1018,16 @@ static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
|
|||
}
|
||||
|
||||
static int mbochs_get_region_info(struct mdev_device *mdev,
|
||||
struct vfio_region_info *region_info,
|
||||
u16 *cap_type_id, void **cap_type)
|
||||
struct vfio_region_info_ext *ext)
|
||||
{
|
||||
struct vfio_region_info *region_info = &ext->base;
|
||||
struct mdev_state *mdev_state;
|
||||
|
||||
mdev_state = mdev_get_drvdata(mdev);
|
||||
if (!mdev_state)
|
||||
return -EINVAL;
|
||||
|
||||
if (region_info->index >= VFIO_PCI_NUM_REGIONS)
|
||||
if (region_info->index >= MBOCHS_NUM_REGIONS)
|
||||
return -EINVAL;
|
||||
|
||||
switch (region_info->index) {
|
||||
|
|
@ -964,6 +1050,20 @@ static int mbochs_get_region_info(struct mdev_device *mdev,
|
|||
region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
|
||||
VFIO_REGION_INFO_FLAG_WRITE);
|
||||
break;
|
||||
case MBOCHS_EDID_REGION_INDEX:
|
||||
ext->base.argsz = sizeof(*ext);
|
||||
ext->base.offset = MBOCHS_EDID_OFFSET;
|
||||
ext->base.size = MBOCHS_EDID_SIZE;
|
||||
ext->base.flags = (VFIO_REGION_INFO_FLAG_READ |
|
||||
VFIO_REGION_INFO_FLAG_WRITE |
|
||||
VFIO_REGION_INFO_FLAG_CAPS);
|
||||
ext->base.cap_offset = offsetof(typeof(*ext), type);
|
||||
ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
|
||||
ext->type.header.version = 1;
|
||||
ext->type.header.next = 0;
|
||||
ext->type.type = VFIO_REGION_TYPE_GFX;
|
||||
ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
|
||||
break;
|
||||
default:
|
||||
region_info->size = 0;
|
||||
region_info->offset = 0;
|
||||
|
|
@ -984,7 +1084,7 @@ static int mbochs_get_device_info(struct mdev_device *mdev,
|
|||
struct vfio_device_info *dev_info)
|
||||
{
|
||||
dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
|
||||
dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
|
||||
dev_info->num_regions = MBOCHS_NUM_REGIONS;
|
||||
dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1084,7 +1184,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
|
|||
unsigned long arg)
|
||||
{
|
||||
int ret = 0;
|
||||
unsigned long minsz;
|
||||
unsigned long minsz, outsz;
|
||||
struct mdev_state *mdev_state;
|
||||
|
||||
mdev_state = mdev_get_drvdata(mdev);
|
||||
|
|
@ -1106,8 +1206,6 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
|
|||
if (ret)
|
||||
return ret;
|
||||
|
||||
memcpy(&mdev_state->dev_info, &info, sizeof(info));
|
||||
|
||||
if (copy_to_user((void __user *)arg, &info, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
|
|
@ -1115,24 +1213,24 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
|
|||
}
|
||||
case VFIO_DEVICE_GET_REGION_INFO:
|
||||
{
|
||||
struct vfio_region_info info;
|
||||
u16 cap_type_id = 0;
|
||||
void *cap_type = NULL;
|
||||
struct vfio_region_info_ext info;
|
||||
|
||||
minsz = offsetofend(struct vfio_region_info, offset);
|
||||
minsz = offsetofend(typeof(info), base.offset);
|
||||
|
||||
if (copy_from_user(&info, (void __user *)arg, minsz))
|
||||
return -EFAULT;
|
||||
|
||||
if (info.argsz < minsz)
|
||||
outsz = info.base.argsz;
|
||||
if (outsz < minsz)
|
||||
return -EINVAL;
|
||||
if (outsz > sizeof(info))
|
||||
return -EINVAL;
|
||||
|
||||
ret = mbochs_get_region_info(mdev, &info, &cap_type_id,
|
||||
&cap_type);
|
||||
ret = mbochs_get_region_info(mdev, &info);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (copy_to_user((void __user *)arg, &info, minsz))
|
||||
if (copy_to_user((void __user *)arg, &info, outsz))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
|
|
@ -1148,7 +1246,7 @@ static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
|
|||
return -EFAULT;
|
||||
|
||||
if ((info.argsz < minsz) ||
|
||||
(info.index >= mdev_state->dev_info.num_irqs))
|
||||
(info.index >= VFIO_PCI_NUM_IRQS))
|
||||
return -EINVAL;
|
||||
|
||||
ret = mbochs_get_irq_info(mdev, &info);
|
||||
|
|
|
|||
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