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author | Izik Eidus <izike@qumranet.com> | 2008-02-10 18:04:15 +0200 |
---|---|---|
committer | Avi Kivity <avi@qumranet.com> | 2008-03-04 15:19:40 +0200 |
commit | 72dc67a69690288538142df73a7e3ac66fea68dc (patch) | |
tree | f40cc5ef0c66686a469977fd438e5b6786f16280 /virt/kvm/kvm_main.c | |
parent | c7ac679c160db864810920df61a6ed14275011aa (diff) | |
download | linux-3.10-72dc67a69690288538142df73a7e3ac66fea68dc.tar.gz linux-3.10-72dc67a69690288538142df73a7e3ac66fea68dc.tar.bz2 linux-3.10-72dc67a69690288538142df73a7e3ac66fea68dc.zip |
KVM: remove the usage of the mmap_sem for the protection of the memory slots.
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>
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r-- | virt/kvm/kvm_main.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 32fbf800696..b2e12893e3f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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(¤t->mm->mmap_sem); + down_write(&kvm->slots_lock); r = __kvm_set_memory_region(kvm, mem, user_alloc); - up_write(¤t->mm->mmap_sem); + up_write(&kvm->slots_lock); return r; } EXPORT_SYMBOL_GPL(kvm_set_memory_region); |