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[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>
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@ -1865,6 +1865,11 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
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{
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int r;
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if (kvm_arch_ops) {
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printk(KERN_ERR "kvm: already loaded the other module\n");
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return -EEXIST;
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}
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kvm_arch_ops = ops;
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if (!kvm_arch_ops->cpu_has_kvm_support()) {
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@ -1907,6 +1912,7 @@ void kvm_exit_arch(void)
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unregister_reboot_notifier(&kvm_reboot_notifier);
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on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
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kvm_arch_ops->hardware_unsetup();
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kvm_arch_ops = NULL;
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}
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static __init int kvm_init(void)
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