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Message-Id: <20251014095055.1159534-1-maobibo@loongson.cn>
Date: Tue, 14 Oct 2025 17:50:55 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Tianrui Zhao <zhaotianrui@...ngson.cn>,
Huacai Chen <chenhuacai@...nel.org>,
Xianglai Li <lixianglai@...ngson.cn>
Cc: kvm@...r.kernel.org,
loongarch@...ts.linux.dev,
linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Subject: [PATCH] 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 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@...r.kernel.org
Fixes: 47256c4c8b1b ("LoongArch: KVM: Avoid copy_*_user() with lock hold in kvm_eiointc_ctrl_access()")
Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
arch/loongarch/kvm/intc/eiointc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/eiointc.c
index c32333695381..a1cc116b4dac 100644
--- 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;
base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
--
2.39.3
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