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KVM: Drop user return notifier when disabling virtualization on a cpu 

This way, we don't leave a dangling notifier on cpu hotunplug or module
unload.  In particular, module unload leaves the notifier pointing into
freed memory.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2009-11-28 14:18:47 +02:00
parent 046d87103a
commit 3548bab501
1 changed files with 9 additions and 0 deletions
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9
arch/x86/kvm/x86.c
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@ -201,6 +201,14 @@ void kvm_set_shared_msr(unsigned slot, u64 value)
}
EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
static void drop_user_return_notifiers(void *ignore)
{
struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
if (smsr->registered)
kvm_on_user_return(&smsr->urn);
}
unsigned long segment_base(u16 selector)
{
struct descriptor_table gdt;
@ -5004,6 +5012,7 @@ int kvm_arch_hardware_enable(void *garbage)
void kvm_arch_hardware_disable(void *garbage)
{
kvm_x86_ops->hardware_disable(garbage);
drop_user_return_notifiers(garbage);
}
int kvm_arch_hardware_setup(void)