[PATCH] x86/64: Add CONFIG_DEVMEM=y for targets/x86/64

[Alberto Bursi]

On 09/02/21 17:46, Supriya Mane wrote:
> Setting 'CONFIG_DEVMEM=y' provides access to /dev/mem.
> Fixes "cannot access '/dev/mem' : No such file or directory"
> 
> Signed-off-by: Supriya Mane <sm.supriya at globaledgesoft.com>
> ---
>   target/linux/x86/64/config-5.4 | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/target/linux/x86/64/config-5.4 b/target/linux/x86/64/config-5.4
> index f09deca5b0..a483d6ea2a 100644
> --- a/target/linux/x86/64/config-5.4
> +++ b/target/linux/x86/64/config-5.4
> @@ -115,6 +115,7 @@ CONFIG_CRYPTO_SIMD=y
>   # CONFIG_CRYPTO_TWOFISH_X86_64_3WAY is not set
>   CONFIG_CRYPTO_XTS=y
>   # CONFIG_DEBUG_HOTPLUG_CPU0 is not set
> +CONFIG_DEVMEM=y
>   CONFIG_DMA_ACPI=y
>   CONFIG_DMA_SHARED_BUFFER=y
>   # CONFIG_DPTF_POWER is not set
> 

It's disabled by default because it is a debugging feature that is not 
terribly secure (lets anyone see the RAM contents, to an extent).

I'm not sure this should be enabled for all x86_64 target like that.

-Alberto