path: root/virt
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authorPaolo Bonzini <pbonzini@redhat.com>2014-09-24 13:02:46 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2014-09-24 14:06:36 +0200
commit3c3c29fd0d7cddc32862c350d0700ce69953e3bd (patch)
tree69a96edbbe94bb5ab6ad6c3f239b72eda13f7593 /virt
parent29f1b65b5984c1e35e2d60d1416d03cee0b91ee2 (diff)
kvm-vfio: do not use module_init
/me got confused between the kernel and QEMU. In the kernel, you can only have one module_init function, and it will prevent unloading the module unless you also have the corresponding module_exit function. So, commit 80ce1639727e (KVM: VFIO: register kvm_device_ops dynamically, 2014-09-02) broke unloading of the kvm module, by adding a module_init function and no module_exit. Repair it by making kvm_vfio_ops_init weak, and checking it in kvm_init. Cc: Will Deacon <will.deacon@arm.com> Cc: Gleb Natapov <gleb@kernel.org> Cc: Alex Williamson <Alex.Williamson@redhat.com> Fixes: 80ce1639727e9d38729c34f162378508c307ca25 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
3 files changed, 19 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index db57363cc287..499db0977f3c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -57,6 +57,7 @@
#include "coalesced_mmio.h"
#include "async_pf.h"
+#include "vfio.h"
#include <trace/events/kvm.h>
@@ -3226,6 +3227,9 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
goto out_undebugfs;
+ r = kvm_vfio_ops_init();
+ WARN_ON(r);
return 0;
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index bb11b36ee8a2..281e7cf2b8e5 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -18,6 +18,7 @@
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/vfio.h>
+#include "vfio.h"
struct kvm_vfio_group {
struct list_head node;
@@ -278,8 +279,7 @@ static int kvm_vfio_create(struct kvm_device *dev, u32 type)
return 0;
-static int __init kvm_vfio_ops_init(void)
+int kvm_vfio_ops_init(void)
return kvm_register_device_ops(&kvm_vfio_ops, KVM_DEV_TYPE_VFIO);
diff --git a/virt/kvm/vfio.h b/virt/kvm/vfio.h
new file mode 100644
index 000000000000..92eac75d6b62
--- /dev/null
+++ b/virt/kvm/vfio.h
@@ -0,0 +1,13 @@
+#ifndef __KVM_VFIO_H
+#define __KVM_VFIO_H
+int kvm_vfio_ops_init(void);
+static inline int kvm_vfio_ops_init(void)
+ return 0;

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