diff options
| -rw-r--r-- | hw/vfio_pci.c | 129 |
1 files changed, 128 insertions, 1 deletions
diff --git a/hw/vfio_pci.c b/hw/vfio_pci.c index a3bae7b..0f74dbb 100644 --- a/hw/vfio_pci.c +++ b/hw/vfio_pci.c @@ -1506,6 +1506,124 @@ static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos) return next - pos; } +static void vfio_set_word_bits(uint8_t *buf, uint16_t val, uint16_t mask) +{ + pci_set_word(buf, (pci_get_word(buf) & ~mask) | val); +} + +static void vfio_add_emulated_word(VFIODevice *vdev, int pos, + uint16_t val, uint16_t mask) +{ + vfio_set_word_bits(vdev->pdev.config + pos, val, mask); + vfio_set_word_bits(vdev->pdev.wmask + pos, ~mask, mask); + vfio_set_word_bits(vdev->emulated_config_bits + pos, mask, mask); +} + +static void vfio_set_long_bits(uint8_t *buf, uint32_t val, uint32_t mask) +{ + pci_set_long(buf, (pci_get_long(buf) & ~mask) | val); +} + +static void vfio_add_emulated_long(VFIODevice *vdev, int pos, + uint32_t val, uint32_t mask) +{ + vfio_set_long_bits(vdev->pdev.config + pos, val, mask); + vfio_set_long_bits(vdev->pdev.wmask + pos, ~mask, mask); + vfio_set_long_bits(vdev->emulated_config_bits + pos, mask, mask); +} + +static int vfio_setup_pcie_cap(VFIODevice *vdev, int pos, uint8_t size) +{ + uint16_t flags; + uint8_t type; + + flags = pci_get_word(vdev->pdev.config + pos + PCI_CAP_FLAGS); + type = (flags & PCI_EXP_FLAGS_TYPE) >> 4; + + if (type != PCI_EXP_TYPE_ENDPOINT && + type != PCI_EXP_TYPE_LEG_END && + type != PCI_EXP_TYPE_RC_END) { + + error_report("vfio: Assignment of PCIe type 0x%x " + "devices is not currently supported", type); + return -EINVAL; + } + + if (!pci_bus_is_express(vdev->pdev.bus)) { + /* + * Use express capability as-is on PCI bus. It doesn't make much + * sense to even expose, but some drivers (ex. tg3) depend on it + * and guests don't seem to be particular about it. We'll need + * to revist this or force express devices to express buses if we + * ever expose an IOMMU to the guest. + */ + } else if (pci_bus_is_root(vdev->pdev.bus)) { + /* + * On a Root Complex bus Endpoints become Root Complex Integrated + * Endpoints, which changes the type and clears the LNK & LNK2 fields. + */ + if (type == PCI_EXP_TYPE_ENDPOINT) { + vfio_add_emulated_word(vdev, pos + PCI_CAP_FLAGS, + PCI_EXP_TYPE_RC_END << 4, + PCI_EXP_FLAGS_TYPE); + + /* Link Capabilities, Status, and Control goes away */ + if (size > PCI_EXP_LNKCTL) { + vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP, 0, ~0); + vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0); + vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA, 0, ~0); + +#ifndef PCI_EXP_LNKCAP2 +#define PCI_EXP_LNKCAP2 44 +#endif +#ifndef PCI_EXP_LNKSTA2 +#define PCI_EXP_LNKSTA2 50 +#endif + /* Link 2 Capabilities, Status, and Control goes away */ + if (size > PCI_EXP_LNKCAP2) { + vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP2, 0, ~0); + vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL2, 0, ~0); + vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA2, 0, ~0); + } + } + + } else if (type == PCI_EXP_TYPE_LEG_END) { + /* + * Legacy endpoints don't belong on the root complex. Windows + * seems to be happier with devices if we skip the capability. + */ + return 0; + } + + } else { + /* + * Convert Root Complex Integrated Endpoints to regular endpoints. + * These devices don't support LNK/LNK2 capabilities, so make them up. + */ + if (type == PCI_EXP_TYPE_RC_END) { + vfio_add_emulated_word(vdev, pos + PCI_CAP_FLAGS, + PCI_EXP_TYPE_ENDPOINT << 4, + PCI_EXP_FLAGS_TYPE); + vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP, + PCI_EXP_LNK_MLW_1 | PCI_EXP_LNK_LS_25, ~0); + vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0); + } + + /* Mark the Link Status bits as emulated to allow virtual negotiation */ + vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA, + pci_get_word(vdev->pdev.config + pos + + PCI_EXP_LNKSTA), + PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS); + } + + pos = pci_add_capability(&vdev->pdev, PCI_CAP_ID_EXP, pos, size); + if (pos >= 0) { + vdev->pdev.exp.exp_cap = pos; + } + + return pos; +} + static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos) { PCIDevice *pdev = &vdev->pdev; @@ -1536,13 +1654,22 @@ static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos) return ret; } } else { - pdev->config[PCI_CAPABILITY_LIST] = 0; /* Begin the rebuild */ + /* Begin the rebuild, use QEMU emulated list bits */ + pdev->config[PCI_CAPABILITY_LIST] = 0; + vdev->emulated_config_bits[PCI_CAPABILITY_LIST] = 0xff; + vdev->emulated_config_bits[PCI_STATUS] |= PCI_STATUS_CAP_LIST; } + /* Use emulated next pointer to allow dropping caps */ + pci_set_byte(vdev->emulated_config_bits + pos + 1, 0xff); + switch (cap_id) { case PCI_CAP_ID_MSI: ret = vfio_setup_msi(vdev, pos); break; + case PCI_CAP_ID_EXP: + ret = vfio_setup_pcie_cap(vdev, pos, size); + break; case PCI_CAP_ID_MSIX: ret = vfio_setup_msix(vdev, pos); break; |