The most important part here, is we emulate a page of MMIO region using a page of memory. That's because MSI-X table was put in the region and we have to intercept it. Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx> --- qemu/hw/device-assignment.c | 287 ++++++++++++++++++++++++++++++++++++++++++- qemu/hw/device-assignment.h | 6 + 2 files changed, 288 insertions(+), 5 deletions(-) diff --git a/qemu/hw/device-assignment.c b/qemu/hw/device-assignment.c index 01485d7..1cd4cf7 100644 --- a/qemu/hw/device-assignment.c +++ b/qemu/hw/device-assignment.c @@ -146,6 +146,7 @@ static void assigned_dev_iomem_map(PCIDevice *pci_dev, int region_num, { AssignedDevice *r_dev = container_of(pci_dev, AssignedDevice, dev); AssignedDevRegion *region = &r_dev->v_addrs[region_num]; + PCIRegion *real_region = &r_dev->real_device.regions[region_num]; uint32_t old_ephys = region->e_physbase; uint32_t old_esize = region->e_size; int first_map = (region->e_size == 0); @@ -161,10 +162,27 @@ static void assigned_dev_iomem_map(PCIDevice *pci_dev, int region_num, kvm_destroy_phys_mem(kvm_context, old_ephys, TARGET_PAGE_ALIGN(old_esize)); - if (e_size > 0) + if (e_size > 0) { + /* deal with MSI-X MMIO page */ + if (real_region->base_addr <= r_dev->msix_table_addr && + real_region->base_addr + real_region->size >= + r_dev->msix_table_addr) { + int offset = r_dev->msix_table_addr - real_region->base_addr; + ret = munmap(region->u.r_virtbase + offset, TARGET_PAGE_SIZE); + if (ret == 0) + DEBUG("munmap done, virt_base 0x%p\n", + region->u.r_virtbase + offset); + else { + fprintf(stderr, "%s: fail munmap msix table!\n", __func__); + exit(1); + } + cpu_register_physical_memory(e_phys + offset, + TARGET_PAGE_SIZE, r_dev->mmio_index); + } ret = kvm_register_phys_mem(kvm_context, e_phys, region->u.r_virtbase, TARGET_PAGE_ALIGN(e_size), 0); + } if (ret != 0) { fprintf(stderr, "%s: Error: create new mapping failed\n", __func__); @@ -669,7 +687,9 @@ void assigned_dev_update_irqs() } } -#if defined(KVM_CAP_DEVICE_MSI) && defined (KVM_CAP_IRQ_ROUTING) +#ifdef KVM_CAP_IRQ_ROUTING + +#ifdef KVM_CAP_DEVICE_MSI static void assigned_dev_update_msi(PCIDevice *pci_dev, unsigned int ctrl_pos) { struct kvm_assigned_irq assigned_irq_data; @@ -724,14 +744,147 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev, unsigned int ctrl_pos) } #endif +#ifdef KVM_CAP_DEVICE_MSIX +static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev) +{ + AssignedDevice *adev = container_of(pci_dev, AssignedDevice, dev); + u16 entries_nr = 0, entries_max_nr; + int pos = 0, i, r = 0; + u32 msg_addr, msg_upper_addr, msg_data, msg_ctrl; + struct kvm_assigned_msix_nr msix_nr; + struct kvm_assigned_msix_entry msix_entry; + void *va = adev->msix_table_page; + + if (adev->cap.available & ASSIGNED_DEVICE_CAP_MSI) + pos = pci_dev->cap.start + PCI_CAPABILITY_CONFIG_MSI_LENGTH; + entries_max_nr = pci_dev->config[pos + 2]; + entries_max_nr &= PCI_MSIX_TABSIZE; + + /* Get the usable entry number for allocating */ + for (i = 0; i < entries_max_nr; i++) { + memcpy(&msg_ctrl, va + i * 16 + 12, 4); + /* 0x1 is mask bit for per vector */ + if (msg_ctrl & 0x1) + continue; + memcpy(&msg_data, va + i * 16 + 8, 4); + /* Ignore unused entry even it's unmasked */ + if (msg_data == 0) + continue; + entries_nr ++; + } + + if (entries_nr == 0) { + fprintf(stderr, "MSI-X entry number is zero!\n"); + return -EINVAL; + } + msix_nr.assigned_dev_id = calc_assigned_dev_id(adev->h_busnr, + (uint8_t)adev->h_devfn); + msix_nr.entry_nr = entries_nr; + r = kvm_assign_set_msix_nr(kvm_context, &msix_nr); + if (r != 0) { + fprintf(stderr, "fail to set MSI-X entry number for MSIX! %s\n", + strerror(-r)); + return r; + } + + free_dev_irq_entries(adev); + adev->irq_entries_nr = entries_nr; + adev->entry = calloc(entries_nr, sizeof(struct kvm_irq_routing_entry)); + if (!adev->entry) { + perror("assigned_dev_update_msix_mmio: "); + return -errno; + } + + msix_entry.assigned_dev_id = msix_nr.assigned_dev_id; + entries_nr = 0; + for (i = 0; i < entries_max_nr; i++) { + if (entries_nr >= msix_nr.entry_nr) + break; + memcpy(&msg_ctrl, va + i * 16 + 12, 4); + if (msg_ctrl & 0x1) + continue; + memcpy(&msg_data, va + i * 16 + 8, 4); + if (msg_data == 0) + continue; + + memcpy(&msg_addr, va + i * 16, 4); + memcpy(&msg_upper_addr, va + i * 16 + 4, 4); + + r = kvm_get_irq_route_gsi(kvm_context); + if (r < 0) + return r; + + adev->entry[entries_nr].gsi = r; + adev->entry[entries_nr].type = KVM_IRQ_ROUTING_MSI; + adev->entry[entries_nr].flags = 0; + adev->entry[entries_nr].u.msi.address_lo = msg_addr; + adev->entry[entries_nr].u.msi.address_hi = msg_upper_addr; + adev->entry[entries_nr].u.msi.data = msg_data; + DEBUG("MSI-X data 0x%x, MSI-X addr_lo 0x%x\n!", msg_data, msg_addr); + kvm_add_routing_entry(kvm_context, &adev->entry[entries_nr]); + + msix_entry.gsi = adev->entry[entries_nr].gsi; + msix_entry.entry = i; + r = kvm_assign_set_msix_entry(kvm_context, &msix_entry); + if (r) { + fprintf(stderr, "fail to set MSI-X entry! %s\n", strerror(-r)); + break; + } + DEBUG("MSI-X entry gsi 0x%x, entry %d\n!", + msix_entry.gsi, msix_entry.entry); + entries_nr ++; + } + + if (r == 0 && kvm_commit_irq_routes(kvm_context) < 0) { + perror("assigned_dev_update_msix_mmio: kvm_commit_irq_routes"); + return -EINVAL; + } + + return r; +} + +static void assigned_dev_update_msix(PCIDevice *pci_dev, unsigned int ctrl_pos) +{ + struct kvm_assigned_irq assigned_irq_data; + AssignedDevice *assigned_dev = container_of(pci_dev, AssignedDevice, dev); + uint16_t *ctrl_word = (uint16_t *)(pci_dev->config + ctrl_pos); + int r; + + memset(&assigned_irq_data, 0, sizeof assigned_irq_data); + assigned_irq_data.assigned_dev_id = + calc_assigned_dev_id(assigned_dev->h_busnr, + (uint8_t)assigned_dev->h_devfn); + + free_dev_irq_entries(assigned_dev); + assigned_irq_data.flags = KVM_DEV_IRQ_HOST_MSIX | KVM_DEV_IRQ_GUEST_MSIX; + r = kvm_deassign_irq(kvm_context, &assigned_irq_data); + /* -ENXIO means no assigned irq */ + if (r && r != -ENXIO) + perror("assigned_dev_update_msix: deassign irq"); + + if (*ctrl_word & PCI_MSIX_ENABLE) { + if (assigned_dev_update_msix_mmio(pci_dev) < 0) { + perror("assigned_dev_update_msix_mmio"); + return; + } + if (kvm_assign_irq(kvm_context, &assigned_irq_data) < 0) { + perror("assigned_dev_enable_msix: assign irq"); + return; + } + } +} +#endif +#endif + static void assigned_device_pci_cap_write_config(PCIDevice *pci_dev, uint32_t address, - uint32_t val, int len) + uint32_t val, int len) { AssignedDevice *assigned_dev = container_of(pci_dev, AssignedDevice, dev); unsigned int pos = pci_dev->cap.start, ctrl_pos; pci_default_cap_write_config(pci_dev, address, val, len); -#if defined(KVM_CAP_DEVICE_MSI) && defined (KVM_CAP_IRQ_ROUTING) +#ifdef KVM_CAP_IRQ_ROUTING +#ifdef KVM_CAP_DEVICE_MSI if (assigned_dev->cap.available & ASSIGNED_DEVICE_CAP_MSI) { ctrl_pos = pos + PCI_MSI_FLAGS; if (address <= ctrl_pos && address + len > ctrl_pos) @@ -739,16 +892,29 @@ static void assigned_device_pci_cap_write_config(PCIDevice *pci_dev, uint32_t ad pos += PCI_CAPABILITY_CONFIG_MSI_LENGTH; } #endif +#ifdef KVM_CAP_DEVICE_MSIX + if (assigned_dev->cap.available & ASSIGNED_DEVICE_CAP_MSIX) { + ctrl_pos = pos + 3; + if (address <= ctrl_pos && address + len > ctrl_pos) { + ctrl_pos--; /* control is word long */ + assigned_dev_update_msix(pci_dev, ctrl_pos); + } + pos += PCI_CAPABILITY_CONFIG_MSIX_LENGTH; + } +#endif +#endif return; } static int assigned_device_pci_cap_init(PCIDevice *pci_dev) { AssignedDevice *dev = container_of(pci_dev, AssignedDevice, dev); + PCIRegion *pci_region = dev->real_device.regions; int next_cap_pt = 0; pci_dev->cap.length = 0; -#if defined(KVM_CAP_DEVICE_MSI) && defined (KVM_CAP_IRQ_ROUTING) +#ifdef KVM_CAP_IRQ_ROUTING +#ifdef KVM_CAP_DEVICE_MSI /* Expose MSI capability * MSI capability is the 1st capability in capability config */ if (pci_find_cap_offset(dev->pdev, PCI_CAP_ID_MSI)) { @@ -761,7 +927,113 @@ static int assigned_device_pci_cap_init(PCIDevice *pci_dev) next_cap_pt = 1; } #endif +#ifdef KVM_CAP_DEVICE_MSIX + /* Expose MSI-X capability */ + if (pci_find_cap_offset(dev->pdev, PCI_CAP_ID_MSIX)) { + int pos, entry_nr, bar_nr; + u32 msix_table_entry; + dev->cap.available |= ASSIGNED_DEVICE_CAP_MSIX; + memset(&pci_dev->config[pci_dev->cap.start + pci_dev->cap.length], + 0, PCI_CAPABILITY_CONFIG_MSIX_LENGTH); + pos = pci_find_cap_offset(dev->pdev, PCI_CAP_ID_MSIX); + entry_nr = pci_read_word(dev->pdev, pos + 2) & PCI_MSIX_TABSIZE; + pci_dev->config[pci_dev->cap.start + pci_dev->cap.length] = 0x11; + pci_dev->config[pci_dev->cap.start + + pci_dev->cap.length + 2] = entry_nr; + msix_table_entry = pci_read_long(dev->pdev, pos + PCI_MSIX_TABLE); + *(uint32_t *)(pci_dev->config + pci_dev->cap.start + + pci_dev->cap.length + PCI_MSIX_TABLE) = msix_table_entry; + *(uint32_t *)(pci_dev->config + pci_dev->cap.start + + pci_dev->cap.length + PCI_MSIX_PBA) = + pci_read_long(dev->pdev, pos + PCI_MSIX_PBA); + bar_nr = msix_table_entry & PCI_MSIX_BIR; + msix_table_entry &= ~PCI_MSIX_BIR; + dev->msix_table_addr = pci_region[bar_nr].base_addr + msix_table_entry; + if (next_cap_pt != 0) { + pci_dev->config[pci_dev->cap.start + next_cap_pt] = + pci_dev->cap.start + pci_dev->cap.length; + next_cap_pt += PCI_CAPABILITY_CONFIG_MSI_LENGTH; + } else + next_cap_pt = 1; + pci_dev->cap.length += PCI_CAPABILITY_CONFIG_MSIX_LENGTH; + } +#endif +#endif + + return 0; +} + +static uint32_t msix_mmio_readl(void *opaque, target_phys_addr_t addr) +{ + AssignedDevice *adev = opaque; + unsigned int offset = addr & 0xfff; + void *page = adev->msix_table_page; + uint32_t val = 0; + + memcpy(&val, (void *)((char *)page + offset), 4); + return val; +} + +static uint32_t msix_mmio_readb(void *opaque, target_phys_addr_t addr) +{ + return ((msix_mmio_readl(opaque, addr & ~3)) >> + (8 * (addr & 3))) & 0xff; +} + +static uint32_t msix_mmio_readw(void *opaque, target_phys_addr_t addr) +{ + return ((msix_mmio_readl(opaque, addr & ~3)) >> + (8 * (addr & 3))) & 0xffff; +} + +static void msix_mmio_writel(void *opaque, + target_phys_addr_t addr, uint32_t val) +{ + AssignedDevice *adev = opaque; + unsigned int offset = addr & 0xfff; + void *page = adev->msix_table_page; + + DEBUG("write to MSI-X entry table mmio offset 0x%lx, val 0x%lx\n", + addr, val); + memcpy((void *)((char *)page + offset), &val, 4); +} + +static void msix_mmio_writew(void *opaque, + target_phys_addr_t addr, uint32_t val) +{ + msix_mmio_writel(opaque, addr & ~3, + (val & 0xffff) << (8*(addr & 3))); +} + +static void msix_mmio_writeb(void *opaque, + target_phys_addr_t addr, uint32_t val) +{ + msix_mmio_writel(opaque, addr & ~3, + (val & 0xff) << (8*(addr & 3))); +} + +static CPUWriteMemoryFunc *msix_mmio_write[] = { + msix_mmio_writeb, msix_mmio_writew, msix_mmio_writel +}; + +static CPUReadMemoryFunc *msix_mmio_read[] = { + msix_mmio_readb, msix_mmio_readw, msix_mmio_readl +}; + +static int assigned_dev_register_msix_mmio(AssignedDevice *dev) +{ + dev->msix_table_page = mmap(NULL, 0x1000, + PROT_READ|PROT_WRITE, + MAP_ANONYMOUS|MAP_PRIVATE, 0, 0); + memset(dev->msix_table_page, 0, 0x1000); + if (dev->msix_table_page == MAP_FAILED) { + fprintf(stderr, "fail allocate msix_table_page! %s\n", + strerror(errno)); + return -EFAULT; + } + dev->mmio_index = cpu_register_io_memory(0, + msix_mmio_read, msix_mmio_write, dev); return 0; } @@ -829,6 +1101,11 @@ struct PCIDevice *init_assigned_device(AssignedDevInfo *adev, PCIBus *bus) assigned_device_pci_cap_init) < 0) goto assigned_out; + /* intercept MSI-X entry page in the MMIO */ + if (dev->cap.available & ASSIGNED_DEVICE_CAP_MSIX) + if (assigned_dev_register_msix_mmio(dev)) + return NULL; + return &dev->dev; assigned_out: diff --git a/qemu/hw/device-assignment.h b/qemu/hw/device-assignment.h index b1f2156..69d549d 100644 --- a/qemu/hw/device-assignment.h +++ b/qemu/hw/device-assignment.h @@ -84,12 +84,18 @@ typedef struct { struct pci_dev *pdev; struct { #define ASSIGNED_DEVICE_CAP_MSI (1 << 0) +#define ASSIGNED_DEVICE_CAP_MSIX (1 << 1) uint32_t available; #define ASSIGNED_DEVICE_MSI_ENABLED (1 << 0) +#define ASSIGNED_DEVICE_MSIX_ENABLED (1 << 1) +#define ASSIGNED_DEVICE_MSIX_MASKED (1 << 2) uint32_t state; } cap; int irq_entries_nr; struct kvm_irq_routing_entry *entry; + void *msix_table_page; + target_phys_addr_t msix_table_addr; + int mmio_index; } AssignedDevice; typedef struct AssignedDevInfo AssignedDevInfo; -- 1.5.4.5 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html