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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2007-12-20 19:18:26 -0500 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-01-30 18:01:21 +0200 |
| commit | aaee2c94f7a1f7726e360a6cfb40173bd552bcff (patch) | |
| tree | e9066ae5509c349bfd6a187e85d52cc476e16a12 /virt/kvm | |
| parent | d7824fff896a1698a07a8046dc362f4500c302f7 (diff) | |
| download | lwn-aaee2c94f7a1f7726e360a6cfb40173bd552bcff.tar.gz lwn-aaee2c94f7a1f7726e360a6cfb40173bd552bcff.zip | |
KVM: MMU: Switch to mmu spinlock
Convert the synchronization of the shadow handling to a separate mmu_lock
spinlock.
Also guard fetch() by mmap_sem in read-mode to protect against alias
and memslot changes.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'virt/kvm')
| -rw-r--r-- | virt/kvm/kvm_main.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 8d0b7c16c2f7..3c4fe26096fc 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -165,6 +165,7 @@ static struct kvm *kvm_create_vm(void) kvm->mm = current->mm; atomic_inc(&kvm->mm->mm_count); + spin_lock_init(&kvm->mmu_lock); kvm_io_bus_init(&kvm->pio_bus); mutex_init(&kvm->lock); kvm_io_bus_init(&kvm->mmio_bus); @@ -552,9 +553,7 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, addr = gfn_to_hva(kvm, gfn); if (kvm_is_error_hva(addr)) return -EFAULT; - pagefault_disable(); r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); - pagefault_enable(); if (r) return -EFAULT; return 0; |