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| author | Yoshimi Ichiyanagi <ichiyanagi.yoshimi@lab.ntt.co.jp> | 2006-12-29 16:49:41 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-30 10:56:44 -0800 |
| commit | 09db28b8a3765a7ec35eba80420c71a7973f5a88 (patch) | |
| tree | 13a43df5bceb1016dd6ad0179b9de8dacabbe145 | |
| parent | a9058ecd3cd72634cf548588ce79b3f225c9ca32 (diff) | |
| download | lwn-09db28b8a3765a7ec35eba80420c71a7973f5a88.tar.gz lwn-09db28b8a3765a7ec35eba80420c71a7973f5a88.zip | |
[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.$B!!(B(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>
| -rw-r--r-- | drivers/kvm/kvm_main.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 38375e2bb703..06314071c6d2 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) |