Re: [Qemu-arm] [Qemu-devel] [PATCH v2 3/4] hw/arm/virt: Declare fwcfg as dma cache coherent in ACPI

[Shannon Zhao <zhaoshenglong@huawei.com>]

On 2017/2/9 20:53, Alexander Graf wrote:
> Fw-cfg recently learned how to directly access guest memory and does so in
> cache coherent fashion. Tell the guest about that fact when it's using ACPI.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>
> ---
>  hw/arm/virt-acpi-build.c | 1 +
>  1 file changed, 1 insertion(+)
> 
Reviewed-by: Shannon Zhao <shannon.zhao@linaro.org>

> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index 8955a9d..0835e59 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -90,6 +90,7 @@ static void acpi_dsdt_add_fw_cfg(Aml *scope, const MemMapEntry *fw_cfg_memmap)
>      aml_append(dev, aml_name_decl("_HID", aml_string("QEMU0002")));
>      /* device present, functioning, decoding, not shown in UI */
>      aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
> +    aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
>  
>      Aml *crs = aml_resource_template();
>      aml_append(crs, aml_memory32_fixed(fw_cfg_memmap->base,
> 

-- 
Shannon