kvm创建虚拟pci设备的几个函数（老版本）

来源：互联网发布：神通数据库下载编辑：程序博客网时间：2024/05/21 19:21

1：

1003 int pci_enable_capability_support(PCIDevice *pci_dev,

1004 uint32_t config_start,

1005 PCICapConfigReadFunc *config_read,

1006 PCICapConfigWriteFunc *config_write,

1007 PCICapConfigInitFunc *config_init)

1008 {

1009 if (!pci_dev)

1010 return -ENODEV;

1011

1012 pci_dev->config[0x06] |= 0x10; // status = capabilities

1013

1014 if (config_start == 0)

1015 pci_dev->cap.start = PCI_CAPABILITY_CONFIG_DEFAULT_START_ADDR;

1016 else if (config_start >= 0x40 && config_start < 0xff)

1017 pci_dev->cap.start = config_start;

1018 else

1019 return -EINVAL;

1020

1021 if (config_read)

1022 pci_dev->cap.config_read = config_read;

1023 else

1024 pci_dev->cap.config_read = pci_default_cap_read_config;

1025 if (config_write)

1026 pci_dev->cap.config_write = config_write;

1027 else

1028 pci_dev->cap.config_write = pci_default_cap_write_config;

1029 pci_dev->cap.supported = 1;

1030 pci_dev->config[PCI_CAPABILITY_LIST] = pci_dev->cap.start;

1031 return config_init(pci_dev);

1032 }

关于irqfd

+#ifdef KVM_CAP_IRQFD+static int _kvm_irqfd(kvm_context_t kvm, int fd, int gsi, int flags)+{+int r;+struct kvm_irqfd data = {+.fd    = fd,+.gsi   = gsi,+.flags = flags,+};++r = ioctl(kvm->vm_fd, KVM_IRQFD, &data);+if (r == -1)+r = -errno;+return r;+}++int kvm_create_irqfd(kvm_context_t kvm, int gsi, int flags)+{+int r;+int fd;++if (!kvm_check_extension(kvm, KVM_CAP_IRQFD))+return -ENOENT;++fd = eventfd(0, 0);+if (fd < 0)+return -errno;++r = _kvm_irqfd(kvm, fd, gsi, 0);+if (r < 0) {+close(fd);+return -errno;+}++return fd;+}++int kvm_destroy_irqfd(kvm_context_t kvm, int fd, int gsi, int flags)+{+return _kvm_irqfd(kvm, fd, gsi, KVM_IRQFD_FLAG_DEASSIGN);+}++#else /* KVM_CAP_IRQFD */++int kvm_create_irqfd(kvm_context_t kvm, int gsi, int flags)+{+return -ENOENT;+}++int kvm_destroy_irqfd(kvm_context_t kvm, int fd, int gsi, int flags)+{+return -ENOENT;+}++#endif /* KVM_CAP_IRQFD */

+int kvm_assign_iofd(kvm_context_t kvm, unsigned long addr, size_t len,+    int fd, int type, int flags)+{+int r;+struct kvm_iofd data = {+.addr  = addr,+.len   = len,+.fd    = fd,+.flags = type ? KVM_IOFD_FLAG_PIO : 0,+};++if (!kvm_check_extension(kvm, KVM_CAP_EVENTFD))+return -ENOENT;++r = ioctl(kvm->vm_fd, KVM_IOFD, &data);+if (r == -1)+r = -errno;+return r;+}++int kvm_deassign_iofd(kvm_context_t kvm, unsigned long addr, size_t len,+      int type, int flags)+{+int r;+struct kvm_iofd data = {+.addr  = addr,+.len   = len,+.flags = KVM_IOFD_FLAG_DEASSIGN | (type ? KVM_IOFD_FLAG_PIO : 0),+};++if (!kvm_check_extension(kvm, KVM_CAP_EVENTFD))+return -ENOENT;++r = ioctl(kvm->vm_fd, KVM_IOFD, &data);+if (r == -1)+r = -errno;+return r;+}+ #else /* KVM_CAP_EVENTFD */