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authorYoshimi Ichiyanagi <ichiyanagi.yoshimi@lab.ntt.co.jp>2006-12-29 16:49:41 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-30 10:56:44 -0800
commit09db28b8a3765a7ec35eba80420c71a7973f5a88 (patch)
tree13a43df5bceb1016dd6ad0179b9de8dacabbe145 /drivers
parenta9058ecd3cd72634cf548588ce79b3f225c9ca32 (diff)
[PATCH] KVM: Initialize kvm_arch_ops on unload
The latest version of kvm doesn't initialize kvm_arch_ops in kvm_init(), which causes an error with the following sequence. 1. Load the supported arch's module. 2. Load the unsupported arch's module. (loading error) 3. Unload the unsupported arch's module. You'll get the following error message after step 3. "BUG: unable to handle to handle kernel paging request at virtual address xxxxxxxx" The problem here is that the unsupported arch's module overwrites kvm_arch_ops of the supported arch's module at step 2. This patch initializes kvm_arch_ops upon loading architecture specific kvm module, and prevents overwriting kvm_arch_ops when kvm_arch_ops is already set correctly. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/kvm/kvm_main.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 38375e2bb70..06314071c6d 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1865,6 +1865,11 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
{
int r;
+ if (kvm_arch_ops) {
+ printk(KERN_ERR "kvm: already loaded the other module\n");
+ return -EEXIST;
+ }
+
kvm_arch_ops = ops;
if (!kvm_arch_ops->cpu_has_kvm_support()) {
@@ -1907,6 +1912,7 @@ void kvm_exit_arch(void)
unregister_reboot_notifier(&kvm_reboot_notifier);
on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
kvm_arch_ops->hardware_unsetup();
+ kvm_arch_ops = NULL;
}
static __init int kvm_init(void)