PWN-Hunter/android_kernel_xiaomi_sdm845
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[PATCH] KVM: Initialize kvm_arch_ops on unload

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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>
This commit is contained in:
Yoshimi Ichiyanagi 2006-12-29 16:49:41 -08:00 committed by Linus Torvalds
parent a9058ecd3c
commit 09db28b8a3
1 changed files with 6 additions and 0 deletions
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6
drivers/kvm/kvm_main.c
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@ -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)