linux-kernel - [PATCH v3 9/9] LoongArch: KVM: INTC: Add address alignment check

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Message-Id: <20250611015145.3042884-1-maobibo@loongson.cn>
Date: Wed, 11 Jun 2025 09:51:45 +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
Subject: [PATCH v3 9/9] LoongArch: KVM: INTC: Add address alignment check

IOCSR instruction supports 1/2/4/8 bytes access, the address should
be naturally aligned with its access size. Here address alignment
check is added in eiointc kernel emulation.

At the same time len must be 1/2/4/8 bytes from iocsr exit emulation
function kvm_emu_iocsr(), remove the default case in switch case
statements.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 arch/loongarch/kvm/intc/eiointc.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/eiointc.c
index 8b0d9376eb54..4e9d12300cc4 100644
--- a/arch/loongarch/kvm/intc/eiointc.c
+++ b/arch/loongarch/kvm/intc/eiointc.c
@@ -311,6 +311,12 @@ static int kvm_eiointc_read(struct kvm_vcpu *vcpu,
 		return -EINVAL;
 	}
 
+	/* len must be 1/2/4/8 from function kvm_emu_iocsr() */
+	if (addr & (len - 1)) {
+		kvm_err("%s: eiointc not aligned addr %llx len %d\n", __func__, addr, len);
+		return -EINVAL;
+	}
+
 	vcpu->stat.eiointc_read_exits++;
 	spin_lock_irqsave(&eiointc->lock, flags);
 	switch (len) {
@@ -323,12 +329,9 @@ static int kvm_eiointc_read(struct kvm_vcpu *vcpu,
 	case 4:
 		ret = loongarch_eiointc_readl(vcpu, eiointc, addr, val);
 		break;
-	case 8:
+	default:
 		ret = loongarch_eiointc_readq(vcpu, eiointc, addr, val);
 		break;
-	default:
-		WARN_ONCE(1, "%s: Abnormal address access: addr 0x%llx, size %d\n",
-						__func__, addr, len);
 	}
 	spin_unlock_irqrestore(&eiointc->lock, flags);
 
@@ -682,6 +685,11 @@ static int kvm_eiointc_write(struct kvm_vcpu *vcpu,
 		return -EINVAL;
 	}
 
+	if (addr & (len - 1)) {
+		kvm_err("%s: eiointc not aligned addr %llx len %d\n", __func__, addr, len);
+		return -EINVAL;
+	}
+
 	vcpu->stat.eiointc_write_exits++;
 	spin_lock_irqsave(&eiointc->lock, flags);
 	switch (len) {
@@ -694,12 +702,9 @@ static int kvm_eiointc_write(struct kvm_vcpu *vcpu,
 	case 4:
 		ret = loongarch_eiointc_writel(vcpu, eiointc, addr, val);
 		break;
-	case 8:
+	default:
 		ret = loongarch_eiointc_writeq(vcpu, eiointc, addr, val);
 		break;
-	default:
-		WARN_ONCE(1, "%s: Abnormal address access: addr 0x%llx, size %d\n",
-						__func__, addr, len);
 	}
 	spin_unlock_irqrestore(&eiointc->lock, flags);
 
-- 
2.39.3