diff --git a/Cargo.lock b/Cargo.lock
index 01da25c9e..1a5dfee62 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -36,7 +36,7 @@ dependencies = [
  "arch_gen 0.1.0",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvm-ioctls 0.2.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
+ "kvm-ioctls 0.3.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "linux-loader 0.1.0 (git+https://github.com/rust-vmm/linux-loader)",
  "rand 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -227,7 +227,7 @@ dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "epoll 4.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvm-ioctls 0.2.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
+ "kvm-ioctls 0.3.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -333,11 +333,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "kvm-ioctls"
-version = "0.2.0"
-source = "git+https://github.com/rust-vmm/kvm-ioctls#30adb021584845eed4124bc8ef3b2b96cd9e159f"
+version = "0.3.0"
+source = "git+https://github.com/rust-vmm/kvm-ioctls#681745a7776d60e390bcf62eefd48531a5f8ec47"
 dependencies = [
  "kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vmm-sys-util 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -961,7 +962,7 @@ dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "devices 0.1.0",
  "kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvm-ioctls 0.2.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
+ "kvm-ioctls 0.3.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "pci 0.1.0",
@@ -1065,7 +1066,7 @@ dependencies = [
  "devices 0.1.0",
  "epoll 4.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvm-ioctls 0.2.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
+ "kvm-ioctls 0.3.0 (git+https://github.com/rust-vmm/kvm-ioctls)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "linux-loader 0.1.0 (git+https://github.com/rust-vmm/linux-loader)",
@@ -1181,7 +1182,7 @@ dependencies = [
 "checksum itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "501266b7edd0174f8530248f87f99c88fbe60ca4ef3dd486835b8d8d53136f7f"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum kvm-bindings 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c223e8703d2eb76d990c5f58e29c85b0f6f50e24b823babde927948e7c71fc03"
-"checksum kvm-ioctls 0.2.0 (git+https://github.com/rust-vmm/kvm-ioctls)" = "<none>"
+"checksum kvm-ioctls 0.3.0 (git+https://github.com/rust-vmm/kvm-ioctls)" = "<none>"
 "checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 "checksum libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)" = "1a31a0627fdf1f6a39ec0dd577e101440b7db22672c0901fe00a9a6fbb5c24e8"
 "checksum libssh2-sys 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)" = "5fcd5a428a31cbbfe059812d74f4b6cd3b9b7426c2bdaec56993c5365da1c328"
diff --git a/Cargo.toml b/Cargo.toml
index abad49449..83d522d13 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ virtio-bindings = "0.1.0"
 vmm = { path = "vmm" }
 vm-device = { path = "vm-device" }
 vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 vm-virtio = { path = "vm-virtio" }
 
 [dev-dependencies]
diff --git a/arch/src/x86_64/regs.rs b/arch/src/x86_64/regs.rs
index 2ab6c26b4..87a9872ec 100644
--- a/arch/src/x86_64/regs.rs
+++ b/arch/src/x86_64/regs.rs
@@ -84,7 +84,9 @@ pub fn setup_msrs(vcpu: &VcpuFd) -> Result<()> {
     msrs.nmsrs = entry_vec.len() as u32;
 
     vcpu.set_msrs(msrs)
-        .map_err(Error::SetModelSpecificRegisters)
+        .map_err(Error::SetModelSpecificRegisters)?;
+
+    Ok(())
 }
 
 /// Configure base registers for a given CPU.
diff --git a/devices/Cargo.toml b/devices/Cargo.toml
index d82ea3b46..7774e1bc0 100644
--- a/devices/Cargo.toml
+++ b/devices/Cargo.toml
@@ -11,7 +11,7 @@ kvm-ioctls = { git = "https://github.com/rust-vmm/kvm-ioctls", branch = "master"
 libc = "0.2.60"
 log = "0.4.8"
 vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 
 [dev-dependencies]
 tempfile = "3.1.0"
diff --git a/net_gen/Cargo.toml b/net_gen/Cargo.toml
index 849ea2581..e64b3d47d 100644
--- a/net_gen/Cargo.toml
+++ b/net_gen/Cargo.toml
@@ -4,4 +4,4 @@ version = "0.1.0"
 authors = ["The Chromium OS Authors"]
 
 [dependencies]
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
diff --git a/net_util/Cargo.toml b/net_util/Cargo.toml
index fed394fc3..02b55954f 100644
--- a/net_util/Cargo.toml
+++ b/net_util/Cargo.toml
@@ -7,7 +7,7 @@ authors = ["The Chromium OS Authors"]
 libc = "0.2.60"
 rand = "0.7.0"
 serde = "1.0.98"
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 
 net_gen = { path = "../net_gen" }
 
diff --git a/pci/Cargo.toml b/pci/Cargo.toml
index ea849f605..ca4806f75 100644
--- a/pci/Cargo.toml
+++ b/pci/Cargo.toml
@@ -11,4 +11,4 @@ devices = { path = "../devices" }
 libc = "0.2.60"
 log = "0.4.8"
 vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
diff --git a/qcow/Cargo.toml b/qcow/Cargo.toml
index b53cc93e6..b85dde909 100755
--- a/qcow/Cargo.toml
+++ b/qcow/Cargo.toml
@@ -13,7 +13,7 @@ byteorder = "1.3.2"
 libc = "0.2.60"
 log = "0.4.8"
 remain = "0.1.3"
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 
 [dev-dependencies]
 tempfile = "3.1.0"
diff --git a/vfio/Cargo.toml b/vfio/Cargo.toml
index bc97afa64..e315e910a 100644
--- a/vfio/Cargo.toml
+++ b/vfio/Cargo.toml
@@ -14,7 +14,7 @@ pci = { path = "../pci" }
 vfio-bindings = "0.1.0"
 vm-allocator = { path = "../vm-allocator" }
 vm-device = { path = "../vm-device" }
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 
 [dependencies.vm-memory]
 git = "https://github.com/rust-vmm/vm-memory"
diff --git a/vfio/src/vfio_pci.rs b/vfio/src/vfio_pci.rs
index 1122a11fe..b4d413370 100644
--- a/vfio/src/vfio_pci.rs
+++ b/vfio/src/vfio_pci.rs
@@ -240,7 +240,7 @@ impl InterruptRoute {
         let irq_fd = EventFd::new(libc::EFD_NONBLOCK).map_err(VfioPciError::EventFd)?;
         let gsi = allocator.allocate_gsi().ok_or(VfioPciError::AllocateGsi)?;
 
-        vm.register_irqfd(irq_fd.as_raw_fd(), gsi)
+        vm.register_irqfd(&irq_fd, gsi)
             .map_err(VfioPciError::IrqFd)?;
 
         Ok(InterruptRoute {
diff --git a/vhost_rs/Cargo.toml b/vhost_rs/Cargo.toml
index 77468b57a..9a6a939df 100644
--- a/vhost_rs/Cargo.toml
+++ b/vhost_rs/Cargo.toml
@@ -15,7 +15,7 @@ vhost-user-slave = []
 [dependencies]
 bitflags = "1.1.0"
 libc = "0.2.60"
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 
 [dependencies.vm-memory]
 git = "https://github.com/rust-vmm/vm-memory"
diff --git a/vhost_user_backend/Cargo.toml b/vhost_user_backend/Cargo.toml
index d370434aa..59450317b 100644
--- a/vhost_user_backend/Cargo.toml
+++ b/vhost_user_backend/Cargo.toml
@@ -14,7 +14,7 @@ epoll = "4.1.0"
 libc = "0.2.65"
 vm-memory = { git = "https://github.com/rust-vmm/vm-memory" } 
 vm-virtio = { path = "../vm-virtio" }
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 
 [dependencies.vhost_rs]
 path = "../vhost_rs"
diff --git a/vm-virtio/Cargo.toml b/vm-virtio/Cargo.toml
index 6fa7b67a9..6009b8fce 100644
--- a/vm-virtio/Cargo.toml
+++ b/vm-virtio/Cargo.toml
@@ -22,7 +22,7 @@ tempfile = "3.1.0"
 virtio-bindings = { git = "https://github.com/rust-vmm/virtio-bindings", version = "0.1", features = ["virtio-v5_0_0"]}
 vm-allocator = { path = "../vm-allocator" }
 vm-device = { path = "../vm-device" }
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 
 [dependencies.vhost_rs]
 path = "../vhost_rs"
diff --git a/vmm/Cargo.toml b/vmm/Cargo.toml
index 7e928d71a..b83b37863 100644
--- a/vmm/Cargo.toml
+++ b/vmm/Cargo.toml
@@ -31,7 +31,7 @@ serde_json = ">=1.0.9"
 vfio = { path = "../vfio", optional = true }
 vm-allocator = { path = "../vm-allocator" }
 vm-virtio = { path = "../vm-virtio" }
-vmm-sys-util = "0.2.0"
+vmm-sys-util = ">=0.1.1"
 signal-hook = "0.1.10"
 threadpool = "1.0"
 
diff --git a/vmm/src/device_manager.rs b/vmm/src/device_manager.rs
index 1f0324a01..cac505d9d 100644
--- a/vmm/src/device_manager.rs
+++ b/vmm/src/device_manager.rs
@@ -362,8 +362,7 @@ impl DeviceRelocation for AddressManager {
             if bar_addr == new_base {
                 for (event, addr, _) in virtio_pci_dev.ioeventfds(new_base) {
                     let io_addr = IoEventAddress::Mmio(addr);
-                    self.vm_fd
-                        .register_ioevent(event.as_raw_fd(), &io_addr, NoDatamatch)?;
+                    self.vm_fd.register_ioevent(event, &io_addr, NoDatamatch)?;
                 }
             }
         }
@@ -442,7 +441,7 @@ impl DeviceManager {
                 let serial_evt = EventFd::new(EFD_NONBLOCK).map_err(DeviceManagerError::EventFd)?;
                 vm_info
                     .vm_fd
-                    .register_irqfd(serial_evt.as_raw_fd(), serial_irq as u32)
+                    .register_irqfd(&serial_evt, serial_irq as u32)
                     .map_err(DeviceManagerError::Irq)?;
 
                 Box::new(KernelIoapicIrq::new(serial_evt))
@@ -1207,7 +1206,7 @@ impl DeviceManager {
         for (event, addr, _) in virtio_pci_device.ioeventfds(bar_addr) {
             let io_addr = IoEventAddress::Mmio(addr);
             vm_fd
-                .register_ioevent(event.as_raw_fd(), &io_addr, NoDatamatch)
+                .register_ioevent(event, &io_addr, NoDatamatch)
                 .map_err(DeviceManagerError::RegisterIoevent)?;
         }
 
@@ -1264,7 +1263,7 @@ impl DeviceManager {
             } else {
                 let irqfd = EventFd::new(EFD_NONBLOCK).map_err(DeviceManagerError::EventFd)?;
                 vm_fd
-                    .register_irqfd(irqfd.as_raw_fd(), irq_num)
+                    .register_irqfd(&irqfd, irq_num)
                     .map_err(DeviceManagerError::Irq)?;
 
                 Box::new(move |_p: InterruptParameters| irqfd.write(1)) as InterruptDelivery
@@ -1318,7 +1317,7 @@ impl DeviceManager {
                 mmio_base.0 + u64::from(vm_virtio::transport::NOTIFY_REG_OFFSET),
             );
             vm_fd
-                .register_ioevent(queue_evt.as_raw_fd(), &io_addr, i as u32)
+                .register_ioevent(queue_evt, &io_addr, i as u32)
                 .map_err(DeviceManagerError::RegisterIoevent)?;
         }
 
@@ -1335,7 +1334,7 @@ impl DeviceManager {
             let irqfd = EventFd::new(EFD_NONBLOCK).map_err(DeviceManagerError::EventFd)?;
 
             vm_fd
-                .register_irqfd(irqfd.as_raw_fd(), irq_num as u32)
+                .register_irqfd(&irqfd, irq_num as u32)
                 .map_err(DeviceManagerError::Irq)?;
 
             Box::new(KernelIoapicIrq::new(irqfd))
diff --git a/vmm/src/vm.rs b/vmm/src/vm.rs
index b8ff57ac1..b0a72538c 100755
--- a/vmm/src/vm.rs
+++ b/vmm/src/vm.rs
@@ -251,7 +251,7 @@ impl CpuidPatch {
         reg: CpuidReg,
         value: u32,
     ) {
-        let entries = cpuid.mut_entries_slice();
+        let entries = cpuid.as_mut_slice();
 
         for entry in entries.iter_mut() {
             if entry.function == function && (index == None || index.unwrap() == entry.index) {
@@ -274,7 +274,7 @@ impl CpuidPatch {
     }
 
     fn patch_cpuid(cpuid: &mut CpuId, patches: Vec<CpuidPatch>) {
-        let entries = cpuid.mut_entries_slice();
+        let entries = cpuid.as_mut_slice();
 
         for entry in entries.iter_mut() {
             for patch in patches.iter() {