aboutsummaryrefslogtreecommitdiff
path: root/virt
diff options
context:
space:
mode:
authorIzik Eidus <izike@qumranet.com>2008-02-10 18:04:15 +0200
committerAvi Kivity <avi@qumranet.com>2008-03-04 15:19:40 +0200
commit72dc67a69690288538142df73a7e3ac66fea68dc (patch)
treef40cc5ef0c66686a469977fd438e5b6786f16280 /virt
parentc7ac679c160db864810920df61a6ed14275011aa (diff)
downloadlinux-linaro-72dc67a69690288538142df73a7e3ac66fea68dc.tar.gz
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')
-rw-r--r--virt/kvm/kvm_main.c5
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(&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);