kvm: Common device control API functions
Introduces two simple functions:
int kvm_device_ioctl(int fd, int type, ...);
int kvm_create_device(KVMState *s, uint64_t type, bool test);
These functions wrap the basic ioctl-based interactions with KVM in a
way similar to other KVM ioctl wrappers.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Message-id: 1392687720-26806-4-git-send-email-christoffer.dall@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/kvm-all.c b/kvm-all.c
index 8670878..290e726 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1784,6 +1784,24 @@
return ret;
}
+int kvm_device_ioctl(int fd, int type, ...)
+{
+ int ret;
+ void *arg;
+ va_list ap;
+
+ va_start(ap, type);
+ arg = va_arg(ap, void *);
+ va_end(ap);
+
+ trace_kvm_device_ioctl(fd, type, arg);
+ ret = ioctl(fd, type, arg);
+ if (ret == -1) {
+ ret = -errno;
+ }
+ return ret;
+}
+
int kvm_has_sync_mmu(void)
{
return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
@@ -2065,3 +2083,24 @@
{
return kvm_arch_on_sigbus(code, addr);
}
+
+int kvm_create_device(KVMState *s, uint64_t type, bool test)
+{
+ int ret;
+ struct kvm_create_device create_dev;
+
+ create_dev.type = type;
+ create_dev.fd = -1;
+ create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0;
+
+ if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
+ return -ENOTSUP;
+ }
+
+ ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &create_dev);
+ if (ret) {
+ return ret;
+ }
+
+ return test ? 0 : create_dev.fd;
+}