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authorMarcelo Tosatti <mtosatti@redhat.com>2008-04-16 17:19:06 -0300
committerAvi Kivity <avi@qumranet.com>2008-04-27 18:21:45 +0300
commit960b3991698872f68f09d51f4c2794ad484fe1fd (patch)
treea5b2d84dfb0f7009538c1c07ca5e244da2be3956
parent1336028b9a1fb33537eab8caec66e812eb8cad63 (diff)
KVM: MMU: kvm_pv_mmu_op should not take mmap_sem
kvm_pv_mmu_op should not take mmap_sem. All gfn_to_page() callers down in the MMU processing will take it if necessary, so as it is it can deadlock. Apparently a leftover from the days before slots_lock. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
-rw-r--r--arch/x86/kvm/mmu.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 078a7f1ac34..2ad6f548167 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2173,8 +2173,6 @@ int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
int r;
struct kvm_pv_mmu_op_buffer buffer;
- down_read(&current->mm->mmap_sem);
-
buffer.ptr = buffer.buf;
buffer.len = min_t(unsigned long, bytes, sizeof buffer.buf);
buffer.processed = 0;
@@ -2194,7 +2192,6 @@ int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
r = 1;
out:
*ret = buffer.processed;
- up_read(&current->mm->mmap_sem);
return r;
}