Enable KVM_SET/GET_VCPU_EVENTS ioctls for Aarch64.

KVM_GET_VCPU_EVENTS and KVM_SET_VCPU_EVENTS ioctls have been supported
on Aarch64 from a recent kernel version.
This patch enables them on Aarch64 and checked cap KVM_CAP_VCPU_EVENTS
before calling them in test code to avoid error in old kernel.

Change-Id: I9526b48948cf0cd5d63444a82b8b09970311a3bb
Signed-off-by: Michael Zhao <michael.zhao@arm.com>

src/cap.rs

@@ -62,7 +62,12 @@ pub enum Cap {
     XenHvm = KVM_CAP_XEN_HVM,
     AdjustClock = KVM_CAP_ADJUST_CLOCK,
     InternalErrorData = KVM_CAP_INTERNAL_ERROR_DATA,
-    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+    #[cfg(any(
+        target_arch = "x86",
+        target_arch = "x86_64",
+        target_arch = "arm",
+        target_arch = "aarch64"
+    ))]
     VcpuEvents = KVM_CAP_VCPU_EVENTS,
     S390Psw = KVM_CAP_S390_PSW,
     PpcSegstate = KVM_CAP_PPC_SEGSTATE,

src/ioctls/vcpu.rs

@@ -852,14 +852,21 @@ impl VcpuFd {
     ///
     /// ```rust
     /// # extern crate kvm_ioctls;
-    /// # use kvm_ioctls::Kvm;
+    /// # use kvm_ioctls::{Kvm, Cap};
     /// let kvm = Kvm::new().unwrap();
-    /// let vm = kvm.create_vm().unwrap();
-    /// let vcpu = vm.create_vcpu(0).unwrap();
-    /// let vcpu_events = vcpu.get_vcpu_events().unwrap();
+    /// if kvm.check_extension(Cap::VcpuEvents) {
+    ///     let vm = kvm.create_vm().unwrap();
+    ///     let vcpu = vm.create_vcpu(0).unwrap();
+    ///     let vcpu_events = vcpu.get_vcpu_events().unwrap();
+    /// }
     /// ```
     ///
-    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+    #[cfg(any(
+        target_arch = "x86",
+        target_arch = "x86_64",
+        target_arch = "arm",
+        target_arch = "aarch64"
+    ))]
     pub fn get_vcpu_events(&self) -> Result<kvm_vcpu_events> {
         let mut vcpu_events = Default::default();
         let ret = unsafe {
@@ -885,16 +892,24 @@ impl VcpuFd {
     ///
     /// ```rust
     /// # extern crate kvm_ioctls;
-    /// # use kvm_ioctls::Kvm;
+    /// # use kvm_ioctls::{Kvm, Cap};
     /// let kvm = Kvm::new().unwrap();
-    /// let vm = kvm.create_vm().unwrap();
-    /// let vcpu = vm.create_vcpu(0).unwrap();
-    /// let vcpu_events = Default::default();
-    /// // Your `vcpu_events` manipulation here.
-    /// vcpu.set_vcpu_events(&vcpu_events).unwrap();
+    /// if kvm.check_extension(Cap::VcpuEvents) {
+    ///     let vm = kvm.create_vm().unwrap();
+    ///     let vcpu = vm.create_vcpu(0).unwrap();
+    ///     let vcpu_events = Default::default();
+    ///     // Your `vcpu_events` manipulation here.
+    ///     vcpu.set_vcpu_events(&vcpu_events).unwrap();
+    /// }
     /// ```
     ///
-    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+    #[cfg(any(
+        target_arch = "x86",
+        target_arch = "x86_64",
+        target_arch = "arm",
+        target_arch = "aarch64"
+    ))]
+
     pub fn set_vcpu_events(&self, vcpu_events: &kvm_vcpu_events) -> Result<()> {
         let ret = unsafe {
             // Here we trust the kernel not to read past the end of the kvm_vcpu_events struct.
@@ -1180,7 +1195,12 @@ mod tests {
     #[cfg(target_arch = "x86_64")]
     use super::*;
     use ioctls::system::Kvm;
-    #[cfg(target_arch = "x86_64")]
+    #[cfg(any(
+        target_arch = "x86",
+        target_arch = "x86_64",
+        target_arch = "arm",
+        target_arch = "aarch64"
+    ))]
     use Cap;
 
     // Helper function for memory mapping `size` bytes of anonymous memory.
@@ -1391,16 +1411,23 @@ mod tests {
         assert_eq!(debugregs, other_debugregs);
     }
 
-    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+    #[cfg(any(
+        target_arch = "x86",
+        target_arch = "x86_64",
+        target_arch = "arm",
+        target_arch = "aarch64"
+    ))]
     #[test]
     fn vcpu_events_test() {
         let kvm = Kvm::new().unwrap();
-        let vm = kvm.create_vm().unwrap();
-        let vcpu = vm.create_vcpu(0).unwrap();
-        let vcpu_events = vcpu.get_vcpu_events().unwrap();
-        vcpu.set_vcpu_events(&vcpu_events).unwrap();
-        let other_vcpu_events = vcpu.get_vcpu_events().unwrap();
-        assert_eq!(vcpu_events, other_vcpu_events);
+        if kvm.check_extension(Cap::VcpuEvents) {
+            let vm = kvm.create_vm().unwrap();
+            let vcpu = vm.create_vcpu(0).unwrap();
+            let vcpu_events = vcpu.get_vcpu_events().unwrap();
+            vcpu.set_vcpu_events(&vcpu_events).unwrap();
+            let other_vcpu_events = vcpu.get_vcpu_events().unwrap();
+            assert_eq!(vcpu_events, other_vcpu_events);
+        }
     }
 
     #[cfg(target_arch = "x86_64")]

src/kvm_ioctls.rs

@@ -150,10 +150,20 @@ ioctl_ior_nr!(KVM_GET_MP_STATE, KVMIO, 0x98, kvm_mp_state);
 ))]
 ioctl_iow_nr!(KVM_SET_MP_STATE, KVMIO, 0x99, kvm_mp_state);
 /* Available with KVM_CAP_VCPU_EVENTS */
-#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+#[cfg(any(
+    target_arch = "x86",
+    target_arch = "x86_64",
+    target_arch = "arm",
+    target_arch = "aarch64"
+))]
 ioctl_ior_nr!(KVM_GET_VCPU_EVENTS, KVMIO, 0x9f, kvm_vcpu_events);
 /* Available with KVM_CAP_VCPU_EVENTS */
-#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+#[cfg(any(
+    target_arch = "x86",
+    target_arch = "x86_64",
+    target_arch = "arm",
+    target_arch = "aarch64"
+))]
 ioctl_iow_nr!(KVM_SET_VCPU_EVENTS, KVMIO, 0xa0, kvm_vcpu_events);
 /* Available with KVM_CAP_DEBUGREGS */
 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]