linux-kernel - Re: [PATCH] LoongArch: KVM: Use kvm_get_vcpu_by_id() instead of kvm_get

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Message-ID: <ed67c8bd-9e79-47c7-9186-910b530a191c@linux.dev>
Date: Tue, 12 Aug 2025 10:06:17 +0800
From: Yanteng Si <si.yanteng@...ux.dev>
To: Song Gao <gaosong@...ngson.cn>, maobibo@...ngson.cn,
 zhaotianrui@...ngson.cn, chenhuacai@...nel.org, lixianglai@...ngson.cn
Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] LoongArch: KVM: Use kvm_get_vcpu_by_id() instead of
 kvm_get_vcpu()

在 8/11/25 10:55 AM, Song Gao 写道:
> Use kvm_get_vcpu() may can't get vcpu context, use kvm_get_vcpu_by_id()
> instead of kvm_get_vcpu().
Since using kvm_get_vcpu() may fail to retrieve the vcpu context,
kvm_get_vcpu_by_id() should be used instead.

Under this premise, and under the premise of making revisions
in accordance with Bibo's and Huacai's suggestions，pick up my tag in v2.

Reviewed-by: Yanteng Si <siyanteng@...oftware.com.cm>

Additionally, do we need a fixes tag?

Thanks,
Yanteng
> 
> Signed-off-by: Song Gao <gaosong@...ngson.cn>
> ---
>   arch/loongarch/kvm/intc/eiointc.c | 5 ++++-
>   arch/loongarch/kvm/intc/ipi.c     | 2 +-
>   2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/eiointc.c
> index a3a12af9ecbf..5180da91d2e6 100644
> --- a/arch/loongarch/kvm/intc/eiointc.c
> +++ b/arch/loongarch/kvm/intc/eiointc.c
> @@ -45,7 +45,10 @@ static void eiointc_update_irq(struct loongarch_eiointc *s, int irq, int level)
>   	}
>   
>   	cpu = s->sw_coremap[irq];
> -	vcpu = kvm_get_vcpu(s->kvm, cpu);
> +	vcpu = kvm_get_vcpu_by_id(s->kvm, cpu);
> +	if (unlikely(vcpu == NULL)) {
> +		return;
> +	}
>   	if (level) {
>   		/* if not enable return false */
>   		if (!test_bit(irq, (unsigned long *)s->enable.reg_u32))
> diff --git a/arch/loongarch/kvm/intc/ipi.c b/arch/loongarch/kvm/intc/ipi.c
> index e658d5b37c04..0348a83a7ed7 100644
> --- a/arch/loongarch/kvm/intc/ipi.c
> +++ b/arch/loongarch/kvm/intc/ipi.c
> @@ -298,7 +298,7 @@ static int kvm_ipi_regs_access(struct kvm_device *dev,
>   	cpu = (attr->attr >> 16) & 0x3ff;
>   	addr = attr->attr & 0xff;
>   
> -	vcpu = kvm_get_vcpu(dev->kvm, cpu);
> +	vcpu = kvm_get_vcpu_by_id(dev->kvm, cpu);
>   	if (unlikely(vcpu == NULL)) {
>   		kvm_err("%s: invalid target cpu: %d\n", __func__, cpu);
>   		return -EINVAL;