[PATCH v2 1/4] KVM: ia64: fix dirty_log_lock spin_lock section not to include get_dirty_log()

Takuya Yoshikawa
2010-06-23T05:59:29Z

kvm_get_dirty_log() calls copy_to_user(). So we need to narrow the
dirty_log_lock spin_lock section not to include this.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya-gVGce1chcLdL9jVzuh4AOg@public.gmane.org>
---
arch/ia64/kvm/kvm-ia64.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index bd510be..d85b5d2 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1817,10 +1817,12 @@ static int kvm_ia64_sync_dirty_log(struct kvm *kvm,
n = kvm_dirty_bitmap_bytes(memslot);
base = memslot->base_gfn / BITS_PER_LONG;

+ spin_lock(&kvm->arch.dirty_log_lock);
for (i = 0; i < n/sizeof(long); ++i) {
memslot->dirty_bitmap[i] = dirty_bitmap[base + i];
dirty_bitmap[base + i] = 0;
}
+ spin_unlock(&kvm->arch.dirty_log_lock);
r = 0;
out:
return r;
@@ -1835,7 +1837,6 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
int is_dirty = 0;

mutex_lock(&kvm->slots_lock);
- spin_lock(&kvm->arch.dirty_log_lock);

r = kvm_ia64_sync_dirty_log(kvm, log);
if (r)
@@ -1855,7 +1856,6 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
r = 0;
out:
mutex_unlock(&kvm->slots_lock);
- spin_unlock(&kvm->arch.dirty_log_lock);
return r;
}

--
1.7.0.4