LoongArch: KVM: Fix max supported vCPUs set with EIOINTC

VM fails to boot with 256 vCPUs, the detailed command is

  qemu-system-loongarch64 -smp 256

and there is an error reported as follows:

  KVM_LOONGARCH_EXTIOI_INIT_NUM_CPU failed: Invalid argument

There is typo issue in function kvm_eiointc_ctrl_access() when set
max supported vCPUs.

Cc: stable@vger.kernel.org
Fixes: 47256c4c8b1b ("LoongArch: KVM: Avoid copy_*_user() with lock hold in kvm_eiointc_ctrl_access()")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/eiointc.c
index c323336953818413385272545399c42fa1ed4173..a1cc116b4dacebf597ab7b82c7e4938396a8f913 100644 (file)
--- a/arch/loongarch/kvm/intc/eiointc.c
+++ b/arch/loongarch/kvm/intc/eiointc.c
@@ -439,7 +439,7 @@ static int kvm_eiointc_ctrl_access(struct kvm_device *dev,
        spin_lock_irqsave(&s->lock, flags);
        switch (type) {
        case KVM_DEV_LOONGARCH_EXTIOI_CTRL_INIT_NUM_CPU:
-               if (val >= EIOINTC_ROUTE_MAX_VCPUS)
+               if (val > EIOINTC_ROUTE_MAX_VCPUS)
                        ret = -EINVAL;
                else
                        s->num_cpu = val;