riscv64: Disable KVM_ENABLE_CAP & KVM_G/SET_REGS

Disable `KVM_ENABLE_CAP`, `KVM_GET_REGS` and `KVM_SET_REGS`, and related
ioctls, tests, doc tests on RISC-V 64-bit platform.

Signed-off-by: Ruoqing He <[email protected]>

Author: RuoqingHe

src/ioctls/vcpu.rs

@@ -222,7 +222,7 @@ impl VcpuFd {
     /// let vcpu = vm.create_vcpu(0).unwrap();
     /// let regs = vcpu.get_regs().unwrap();
     /// ```
-    #[cfg(not(any(target_arch = "arm", target_arch = "aarch64")))]
+    #[cfg(not(any(target_arch = "arm", target_arch = "aarch64", target_arch = "riscv64")))]
     pub fn get_regs(&self) -> Result<kvm_regs> {
         let mut regs = kvm_regs::default();
         // SAFETY: Safe because we know that our file is a vCPU fd, we know the kernel will only
@@ -338,7 +338,7 @@ impl VcpuFd {
     /// regs.rip = 0x100;
     /// vcpu.set_regs(&regs).unwrap();
     /// ```
-    #[cfg(not(any(target_arch = "arm", target_arch = "aarch64")))]
+    #[cfg(not(any(target_arch = "arm", target_arch = "aarch64", target_arch = "riscv64")))]
     pub fn set_regs(&self, regs: &kvm_regs) -> Result<()> {
         // SAFETY: Safe because we know that our file is a vCPU fd, we know the kernel will only
         // read the correct amount of memory from our pointer, and we verify the return result.

src/ioctls/vm.rs

@@ -1376,7 +1376,7 @@ impl VmFd {
     ///     vm.enable_cap(&cap).unwrap();
     /// }
     /// ```
-    #[cfg(not(any(target_arch = "arm", target_arch = "aarch64")))]
+    #[cfg(not(any(target_arch = "arm", target_arch = "aarch64", target_arch = "riscv64")))]
     pub fn enable_cap(&self, cap: &kvm_enable_cap) -> Result<()> {
         // SAFETY: The ioctl is safe because we allocated the struct and we know the
         // kernel will write exactly the size of the struct.
@@ -2441,7 +2441,7 @@ mod tests {
     }
 
     #[test]
-    #[cfg(not(any(target_arch = "arm", target_arch = "aarch64")))]
+    #[cfg(not(any(target_arch = "arm", target_arch = "aarch64", target_arch = "riscv64")))]
     fn test_enable_cap_failure() {
         let kvm = Kvm::new().unwrap();
         let vm = kvm.create_vm().unwrap();

src/kvm_ioctls.rs

@@ -139,9 +139,9 @@ ioctl_ior_nr!(KVM_MEMORY_ENCRYPT_UNREG_REGION, KVMIO, 0xbc, kvm_enc_region);
 // Ioctls for VCPU fds.
 
 ioctl_io_nr!(KVM_RUN, KVMIO, 0x80);
-#[cfg(not(any(target_arch = "arm", target_arch = "aarch64")))]
+#[cfg(not(any(target_arch = "arm", target_arch = "aarch64", target_arch = "riscv64")))]
 ioctl_ior_nr!(KVM_GET_REGS, KVMIO, 0x81, kvm_regs);
-#[cfg(not(any(target_arch = "arm", target_arch = "aarch64")))]
+#[cfg(not(any(target_arch = "arm", target_arch = "aarch64", target_arch = "riscv64")))]
 ioctl_iow_nr!(KVM_SET_REGS, KVMIO, 0x82, kvm_regs);
 #[cfg(any(
     target_arch = "x86",
@@ -248,7 +248,7 @@ ioctl_io_nr!(KVM_SET_TSC_KHZ, KVMIO, 0xa2);
 ioctl_io_nr!(KVM_GET_TSC_KHZ, KVMIO, 0xa3);
 
 /* Available with KVM_CAP_ENABLE_CAP */
-#[cfg(not(any(target_arch = "arm", target_arch = "aarch64")))]
+#[cfg(not(any(target_arch = "arm", target_arch = "aarch64", target_arch = "riscv64")))]
 ioctl_iow_nr!(KVM_ENABLE_CAP, KVMIO, 0xa3, kvm_enable_cap);
 /* Available with KVM_CAP_SIGNAL_MSI */
 #[cfg(any(