提交 3eb4ee68 编写于 作者: T Thomas Huth 提交者: Paul Mackerras

KVM: PPC: Book3S: Take the kvm->srcu lock in kvmppc_h_logical_ci_load/store()

Access to the kvm->buses (like with the kvm_io_bus_read() and -write()
functions) has to be protected via the kvm->srcu lock.
The kvmppc_h_logical_ci_load() and -store() functions are missing
this lock so far, so let's add it there, too.
This fixes the problem that the kernel reports "suspicious RCU usage"
when lock debugging is enabled.

Cc: stable@vger.kernel.org # v4.1+
Fixes: 99342cf8Signed-off-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>
上级 7e022e71
......@@ -829,12 +829,15 @@ int kvmppc_h_logical_ci_load(struct kvm_vcpu *vcpu)
unsigned long size = kvmppc_get_gpr(vcpu, 4);
unsigned long addr = kvmppc_get_gpr(vcpu, 5);
u64 buf;
int srcu_idx;
int ret;
if (!is_power_of_2(size) || (size > sizeof(buf)))
return H_TOO_HARD;
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
ret = kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, size, &buf);
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
if (ret != 0)
return H_TOO_HARD;
......@@ -869,6 +872,7 @@ int kvmppc_h_logical_ci_store(struct kvm_vcpu *vcpu)
unsigned long addr = kvmppc_get_gpr(vcpu, 5);
unsigned long val = kvmppc_get_gpr(vcpu, 6);
u64 buf;
int srcu_idx;
int ret;
switch (size) {
......@@ -892,7 +896,9 @@ int kvmppc_h_logical_ci_store(struct kvm_vcpu *vcpu)
return H_TOO_HARD;
}
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
ret = kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, size, &buf);
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
if (ret != 0)
return H_TOO_HARD;
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册