6.17-stable review patch. If anyone has any objections, please let me know.
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From: Bibo Mao maobibo@loongson.cn
commit 237e74bfa261fb0cf75bd08c9be0c5094018ee20 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/loongarch/kvm/intc/eiointc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/loongarch/kvm/intc/eiointc.c +++ b/arch/loongarch/kvm/intc/eiointc.c @@ -439,7 +439,7 @@ static int kvm_eiointc_ctrl_access(struc 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;