[v3,3/3] hw/loongarch/virt: Use MemTxAttrs interface for misc ops

Use MemTxAttrs interface read_with_attrs/write_with_attrs
for virt_iocsr_misc_ops.

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 hw/loongarch/virt.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

On 2024/5/21 下午8:32, Song Gao wrote:
> Use MemTxAttrs interface read_with_attrs/write_with_attrs
> for virt_iocsr_misc_ops.
> 
> Signed-off-by: Song Gao <gaosong@loongson.cn>
> ---
>   hw/loongarch/virt.c | 26 ++++++++++++++++----------
>   1 file changed, 16 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
> index e7edc6c9f9..0ab2b6860a 100644
> --- a/hw/loongarch/virt.c
> +++ b/hw/loongarch/virt.c
> @@ -866,8 +866,9 @@ static void virt_firmware_init(LoongArchVirtMachineState *lvms)
>       }
>   }
>   
> -static void virt_iocsr_misc_write(void *opaque, hwaddr addr,
> -                                  uint64_t val, unsigned size)
> +static MemTxResult virt_iocsr_misc_write(void *opaque, hwaddr addr,
> +                                         uint64_t val, unsigned size,
> +                                         MemTxAttrs attrs)
>   {
>       LoongArchVirtMachineState *lvms = LOONGARCH_VIRT_MACHINE(opaque);
>       uint64_t features;
> @@ -875,12 +876,12 @@ static void virt_iocsr_misc_write(void *opaque, hwaddr addr,
>       switch (addr) {
>       case MISC_FUNC_REG:
>           if (!virt_is_veiointc_enabled(lvms)) {
> -            return;
> +            return MEMTX_OK;
>           }
>   
>           features = address_space_ldl(&lvms->as_iocsr,
>                                        EXTIOI_VIRT_BASE + EXTIOI_VIRT_CONFIG,
> -                                     MEMTXATTRS_UNSPECIFIED, NULL);
> +                                     attrs, NULL);
>           if (val & BIT_ULL(IOCSRM_EXTIOI_EN)) {
>               features |= BIT(EXTIOI_ENABLE);
>           }
> @@ -890,11 +891,15 @@ static void virt_iocsr_misc_write(void *opaque, hwaddr addr,
>   
>           address_space_stl(&lvms->as_iocsr,
>                             EXTIOI_VIRT_BASE + EXTIOI_VIRT_CONFIG,
> -                          features, MEMTXATTRS_UNSPECIFIED, NULL);
> +                          features, attrs, NULL);
>       }
> +
> +    return MEMTX_OK;
>   }
>   
> -static uint64_t virt_iocsr_misc_read(void *opaque, hwaddr addr, unsigned size)
> +static MemTxResult virt_iocsr_misc_read(void *opaque, hwaddr addr,
> +                                        uint64_t *data,
> +                                        unsigned size, MemTxAttrs attrs)
>   {
>       LoongArchVirtMachineState *lvms = LOONGARCH_VIRT_MACHINE(opaque);
>       uint64_t ret = 0;
> @@ -924,7 +929,7 @@ static uint64_t virt_iocsr_misc_read(void *opaque, hwaddr addr, unsigned size)
>   
>           features = address_space_ldl(&lvms->as_iocsr,
>                                        EXTIOI_VIRT_BASE + EXTIOI_VIRT_CONFIG,
> -                                     MEMTXATTRS_UNSPECIFIED, NULL);
> +                                     attrs, NULL);
>           if (features & BIT(EXTIOI_ENABLE)) {
>               ret |= BIT_ULL(IOCSRM_EXTIOI_EN);
>           }
> @@ -933,12 +938,13 @@ static uint64_t virt_iocsr_misc_read(void *opaque, hwaddr addr, unsigned size)
>           }
>       }
>   
> -    return ret;
> +    *data = ret;
> +    return MEMTX_OK;
>   }
>   
>   static const MemoryRegionOps virt_iocsr_misc_ops = {
> -    .read  = virt_iocsr_misc_read,
> -    .write = virt_iocsr_misc_write,
> +    .read_with_attrs  = virt_iocsr_misc_read,
> +    .write_with_attrs = virt_iocsr_misc_write,
>       .endianness = DEVICE_LITTLE_ENDIAN,
>       .valid = {
>           .min_access_size = 4,
> 
I think patch3 should be put ahead of patch2. Without patch3, there is 
potential problem to access iocsr EXTIOI_VIRT_CONFIG register with 
MEMTXATTRS_UNSPECIFIED attr.

Now extioi is emulated in user space, it will be better if hypervisor 
and VM know whether v-extioi extension is supported.

Regards
Bibo Mao