Re: [PATCH v1 8/9] target/loongarch: Implement set vcpu intr for kvm

[Philippe Mathieu-Daudé]

On 8/11/23 02:41, xianglai li wrote:
> From: Tianrui Zhao <zhaotianrui@loongson.cn>
>
> Implement loongarch kvm set vcpu interrupt interface,
> when a irq is set in vcpu, we use the KVM_INTERRUPT
> ioctl to set intr into kvm.
>
> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
> Signed-off-by: xianglai li <lixianglai@loongson.cn>
> ---
>   target/loongarch/cpu.c           | 18 +++++++++++++-----
>   target/loongarch/kvm-stub.c      | 13 +++++++++++++
>   target/loongarch/kvm.c           | 15 +++++++++++++++
>   target/loongarch/kvm_loongarch.h | 13 +++++++++++++
>   target/loongarch/trace-events    |  1 +
>   5 files changed, 55 insertions(+), 5 deletions(-)
>   create mode 100644 target/loongarch/kvm-stub.c
>   create mode 100644 target/loongarch/kvm_loongarch.h
>
> diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
> index 0a4d1a9778..3073f1548d 100644
> --- a/target/loongarch/cpu.c
> +++ b/target/loongarch/cpu.c
> @@ -20,6 +20,11 @@
>   #include "sysemu/reset.h"
>   #include "tcg/tcg.h"
>   #include "vec.h"
> +#include "sysemu/kvm.h"
> +#include "kvm_loongarch.h"
> +#ifdef CONFIG_KVM
> +#include <linux/kvm.h>
> +#endif
>   
>   const char * const regnames[32] = {
>       "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
> @@ -108,12 +113,15 @@ void loongarch_cpu_set_irq(void *opaque, int irq, int 
> level)
>           return;
>       }
>   
> -    env->CSR_ESTAT = deposit64(env->CSR_ESTAT, irq, 1, level != 0);
> -
> -    if (FIELD_EX64(env->CSR_ESTAT, CSR_ESTAT, IS)) {
> -        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
> +    if (kvm_enabled()) {
> +        kvm_loongarch_set_interrupt(cpu, irq, level);

Since you guard this call with kvm_enabled(), ...

>       } else {
> -        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
> +        env->CSR_ESTAT = deposit64(env->CSR_ESTAT, irq, 1, level != 0);
> +        if (FIELD_EX64(env->CSR_ESTAT, CSR_ESTAT, IS)) {
> +            cpu_interrupt(cs, CPU_INTERRUPT_HARD);
> +        } else {
> +            cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
> +        }
>       }
>   }
>   
> diff --git a/target/loongarch/kvm-stub.c b/target/loongarch/kvm-stub.c
> new file mode 100644
> index 0000000000..d38c30ec78
> --- /dev/null
> +++ b/target/loongarch/kvm-stub.c
> @@ -0,0 +1,13 @@
> +/*
> + * QEMU KVM LoongArch specific function stubs
> + *
> + * Copyright (c) 2023 Loongson Technology Corporation Limited
> + */
> +#include "qemu/osdep.h"
> +#include "cpu.h"
> +#include "kvm_loongarch.h"
> +
> +int kvm_loongarch_set_interrupt(LoongArchCPU *cpu, int irq, int level)
> +{
> +   g_assert_not_reached();

... this stub shouldn't be required.

Have you tested a TCG-only build? Then a KVM-only one?

> +}


> diff --git a/target/loongarch/kvm_loongarch.h b/target/loongarch/kvm_loongarch.h
> new file mode 100644
> index 0000000000..cdef980eec
> --- /dev/null
> +++ b/target/loongarch/kvm_loongarch.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * QEMU LoongArch kvm interface
> + *
> + * Copyright (c) 2023 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef QEMU_KVM_LOONGARCH_H
> +#define QEMU_KVM_LOONGARCH_H
> +

Missing:

#include "cpu.h"

to get the LoongArchCPU type declaration.

> +int  kvm_loongarch_set_interrupt(LoongArchCPU *cpu, int irq, int level);
> +
> +#endif

Regards,

Phil.