diff --git a/src/runtime-rs/crates/hypervisor/ch-config/src/convert.rs b/src/runtime-rs/crates/hypervisor/ch-config/src/convert.rs
index 638a333560..314dcbe929 100644
--- a/src/runtime-rs/crates/hypervisor/ch-config/src/convert.rs
+++ b/src/runtime-rs/crates/hypervisor/ch-config/src/convert.rs
@@ -28,6 +28,11 @@ const DEFAULT_CH_MAX_PHYS_BITS: u8 = 46;
 
 const DEFAULT_VSOCK_CID: u64 = 3;
 
+pub const DEFAULT_NUM_PCI_SEGMENTS: u16 = 1;
+
+pub const DEFAULT_DISK_QUEUES: usize = 1;
+pub const DEFAULT_DISK_QUEUE_SIZE: u16 = 128;
+
 impl TryFrom<NamedHypervisorConfig> for VmConfig {
     type Error = VmConfigError;
 
@@ -355,6 +360,8 @@ impl TryFrom<BootInfo> for DiskConfig {
         let disk = DiskConfig {
             path: Some(path),
             readonly: true,
+            num_queues: DEFAULT_DISK_QUEUES,
+            queue_size: DEFAULT_DISK_QUEUE_SIZE,
 
             ..Default::default()
         };
@@ -438,6 +445,7 @@ fn get_platform_cfg(tdx_enabled: bool) -> Option<PlatformConfig> {
     if tdx_enabled {
         let platform = PlatformConfig {
             tdx: true,
+            num_pci_segments: DEFAULT_NUM_PCI_SEGMENTS,
 
             ..Default::default()
         };
@@ -584,6 +592,8 @@ mod tests {
         let disk_config = DiskConfig {
             path: Some(PathBuf::from(path)),
             readonly: true,
+            num_queues: DEFAULT_DISK_QUEUES,
+            queue_size: DEFAULT_DISK_QUEUE_SIZE,
 
             ..Default::default()
         };
@@ -788,6 +798,7 @@ mod tests {
                 tdx_enabled: true,
                 result: Some(PlatformConfig {
                     tdx: true,
+                    num_pci_segments: DEFAULT_NUM_PCI_SEGMENTS,
 
                     ..Default::default()
                 }),
diff --git a/src/runtime-rs/crates/hypervisor/src/ch/inner_device.rs b/src/runtime-rs/crates/hypervisor/src/ch/inner_device.rs
index 53dad6b294..49fb9a06e3 100644
--- a/src/runtime-rs/crates/hypervisor/src/ch/inner_device.rs
+++ b/src/runtime-rs/crates/hypervisor/src/ch/inner_device.rs
@@ -13,6 +13,7 @@ use crate::ShareFsDeviceConfig;
 use crate::VmmState;
 use anyhow::{anyhow, Context, Result};
 use ch_config::ch_api::{cloud_hypervisor_vm_blockdev_add, cloud_hypervisor_vm_fs_add};
+use ch_config::convert::{DEFAULT_DISK_QUEUES, DEFAULT_DISK_QUEUE_SIZE, DEFAULT_NUM_PCI_SEGMENTS};
 use ch_config::DiskConfig;
 use ch_config::{net_util::MacAddr, FsConfig, NetConfig};
 use safe_path::scoped_join;
@@ -20,8 +21,9 @@ use std::convert::TryFrom;
 use std::path::PathBuf;
 
 const VIRTIO_FS: &str = "virtio-fs";
-const DEFAULT_DISK_QUEUES: usize = 1;
-const DEFAULT_DISK_QUEUE_SIZE: u16 = 1024;
+
+pub const DEFAULT_FS_QUEUES: usize = 1;
+const DEFAULT_FS_QUEUE_SIZE: u16 = 1024;
 
 impl CloudHypervisorInner {
     pub(crate) async fn add_device(&mut self, device: DeviceType) -> Result<()> {
@@ -93,13 +95,13 @@ impl CloudHypervisorInner {
         let num_queues: usize = if cfg.queue_num > 0 {
             cfg.queue_num as usize
         } else {
-            1
+            DEFAULT_FS_QUEUES
         };
 
         let queue_size: u16 = if cfg.queue_num > 0 {
             u16::try_from(cfg.queue_size)?
         } else {
-            1024
+            DEFAULT_FS_QUEUE_SIZE
         };
 
         let socket_path = if cfg.sock_path.starts_with('/') {
@@ -113,6 +115,8 @@ impl CloudHypervisorInner {
             socket: socket_path,
             num_queues,
             queue_size,
+            pci_segment: DEFAULT_NUM_PCI_SEGMENTS,
+
             ..Default::default()
         };
 
@@ -233,13 +237,13 @@ impl TryFrom<ShareFsSettings> for FsConfig {
         let num_queues: usize = if cfg.queue_num > 0 {
             cfg.queue_num as usize
         } else {
-            DEFAULT_DISK_QUEUES
+            DEFAULT_FS_QUEUES
         };
 
         let queue_size: u16 = if cfg.queue_num > 0 {
             u16::try_from(cfg.queue_size)?
         } else {
-            DEFAULT_DISK_QUEUE_SIZE
+            DEFAULT_FS_QUEUE_SIZE
         };
 
         let socket_path = if cfg.sock_path.starts_with('/') {