diff options
| author | Bibo Mao <maobibo@loongson.cn> | 2025-08-20 22:51:14 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2025-08-20 22:51:14 +0800 |
| commit | 4be8cefc132606b4a6e851f37f8e8c40c406c910 (patch) | |
| tree | 6db42d171a5af369d4ab85d0f9b097a863a17010 | |
| parent | 0078e94a4733454d1ffa3888afe88bf19c81b91c (diff) | |
LoongArch: KVM: Make function kvm_own_lbt() robust
Add the flag KVM_LARCH_LBT checking in function kvm_own_lbt(), so that
it can be called safely rather than duplicated enabling again.
Cc: stable@vger.kernel.org
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
| -rw-r--r-- | arch/loongarch/kvm/vcpu.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index d1b8c50941ca..ce478151466c 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -1283,9 +1283,11 @@ int kvm_own_lbt(struct kvm_vcpu *vcpu) return -EINVAL; preempt_disable(); - set_csr_euen(CSR_EUEN_LBTEN); - _restore_lbt(&vcpu->arch.lbt); - vcpu->arch.aux_inuse |= KVM_LARCH_LBT; + if (!(vcpu->arch.aux_inuse & KVM_LARCH_LBT)) { + set_csr_euen(CSR_EUEN_LBTEN); + _restore_lbt(&vcpu->arch.lbt); + vcpu->arch.aux_inuse |= KVM_LARCH_LBT; + } preempt_enable(); return 0; |