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KVM: remove the usage of the mmap_sem for the protection of the memory slots.

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This patch replaces the mmap_sem lock for the memory slots with a new
kvm private lock, it is needed beacuse untill now there were cases where
kvm accesses user memory while holding the mmap semaphore.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Izik Eidus
2008-02-10 18:04:15 +02:00
committed by Avi Kivity
parent c7ac679c16
commit 72dc67a696
6 changed files with 75 additions and 40 deletions
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5
virt/kvm/kvm_main.c
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@@ -169,6 +169,7 @@ static struct kvm *kvm_create_vm(void)
kvm_io_bus_init(&kvm->pio_bus);
mutex_init(&kvm->lock);
kvm_io_bus_init(&kvm->mmio_bus);
init_rwsem(&kvm->slots_lock);
spin_lock(&kvm_lock);
list_add(&kvm->vm_list, &vm_list);
spin_unlock(&kvm_lock);
@@ -339,9 +340,9 @@ int kvm_set_memory_region(struct kvm *kvm,
{
int r;
down_write(&current->mm->mmap_sem);
down_write(&kvm->slots_lock);
r = __kvm_set_memory_region(kvm, mem, user_alloc);
up_write(&current->mm->mmap_sem);
up_write(&kvm->slots_lock);
return r;
}
EXPORT_SYMBOL_GPL(kvm_set_memory_region);