diff options
| author | Bibo Mao <maobibo@loongson.cn> | 2025-08-20 22:51:14 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-28 16:31:02 +0200 |
| commit | 3575d22e94dc41e486397459c1566c58858a4620 (patch) | |
| tree | 1986dd0afea04962e0b00a6048d5394a205552d4 | |
| parent | 0a42692cdb8f004cd829bcdbbaeef0117196f8ed (diff) | |
LoongArch: KVM: Make function kvm_own_lbt() robust
commit 4be8cefc132606b4a6e851f37f8e8c40c406c910 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 4b0ae29b8aca..b5439a10b765 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -1249,9 +1249,11 @@ 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; |