KVM: Advertise the bug in memory region destruction as fixed
Userspace might need to act differently.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 0997e6f..4880776 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -395,6 +395,8 @@
#if defined(CONFIG_X86)
#define KVM_CAP_DEVICE_MSI 20
#endif
+/* Bug in KVM_SET_USER_MEMORY_REGION fixed: */
+#define KVM_CAP_DESTROY_MEMORY_REGION_WORKS 21
/*
* ioctls for VM fds
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e7644b9..e066eb1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1905,6 +1905,17 @@
return fd;
}
+static long kvm_dev_ioctl_check_extension_generic(long arg)
+{
+ switch (arg) {
+ case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
+ return 1;
+ default:
+ break;
+ }
+ return kvm_dev_ioctl_check_extension(arg);
+}
+
static long kvm_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -1924,7 +1935,7 @@
r = kvm_dev_ioctl_create_vm();
break;
case KVM_CHECK_EXTENSION:
- r = kvm_dev_ioctl_check_extension(arg);
+ r = kvm_dev_ioctl_check_extension_generic(arg);
break;
case KVM_GET_VCPU_MMAP_SIZE:
r = -EINVAL;