linux-kernel - Re: [PATCH 1/1] efi/efi_test: read RuntimeServicesSupported

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Message-ID: <1fbab8b3-3a37-f3f5-39b4-0c8123d27b29@canonical.com>
Date:   Mon, 30 Nov 2020 16:16:07 +0800
From:   ivanhu <ivan.hu@...onical.com>
To:     Heinrich Schuchardt <xypron.glpk@....de>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Colin King <colin.king@...onical.com>,
        fwts-devel@...ts.ubuntu.com
Subject: Re: [PATCH 1/1] efi/efi_test: read RuntimeServicesSupported

Hi Heinrich,

Thanks for the patch.
It looks good to me, but I noticed that the runtime_supported_mask was
introduced after 5.7-rc1.
Maybe we should add the kernel version checking for the old kernels.

Cheers,
Ivan

On 11/28/20 3:20 AM, Heinrich Schuchardt wrote:
> Since the UEFI 2.8A specification the UEFI enabled firmware provides a
> configuration table EFI_RT_PROPERTIES_TABLE which indicates which runtime
> services are enabled. The EFI stub reads this table and saves the value of
> the field RuntimeServicesSupported internally.
> 
> The Firmware Test Suite requires the value to determine if UEFI runtime
> services are correctly implemented.
> 
> With this patch an IOCTL call is provided to read the value of the field
> RuntimeServicesSupported, e.g.
> 
>     #define EFI_RUNTIME_GET_SUPPORTED_MASK \
>             _IOR('p', 0x0C, unsigned int)
>     unsigned int mask;
>     fd = open("/dev/efi_test", O_RDWR);
>     ret = ioctl(fd, EFI_RUNTIME_GET_SUPPORTED_MASK, &mask);
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> ---
>  drivers/firmware/efi/test/efi_test.c | 16 ++++++++++++++++
>  drivers/firmware/efi/test/efi_test.h |  3 +++
>  2 files changed, 19 insertions(+)
> 
> diff --git a/drivers/firmware/efi/test/efi_test.c b/drivers/firmware/efi/test/efi_test.c
> index ddf9eae396fe..47d67bb0a516 100644
> --- a/drivers/firmware/efi/test/efi_test.c
> +++ b/drivers/firmware/efi/test/efi_test.c
> @@ -663,6 +663,19 @@ static long efi_runtime_query_capsulecaps(unsigned long arg)
>  	return rv;
>  }
> 
> +static long efi_runtime_get_supported_mask(unsigned long arg)
> +{
> +	unsigned int __user *supported_mask;
> +	int rv = 0;
> +
> +	supported_mask = (unsigned int *)arg;
> +
> +	if (put_user(efi.runtime_supported_mask, supported_mask))
> +		rv = -EFAULT;
> +
> +	return rv;
> +}
> +
>  static long efi_test_ioctl(struct file *file, unsigned int cmd,
>  							unsigned long arg)
>  {
> @@ -699,6 +712,9 @@ static long efi_test_ioctl(struct file *file, unsigned int cmd,
> 
>  	case EFI_RUNTIME_RESET_SYSTEM:
>  		return efi_runtime_reset_system(arg);
> +
> +	case EFI_RUNTIME_GET_SUPPORTED_MASK:
> +		return efi_runtime_get_supported_mask(arg);
>  	}
> 
>  	return -ENOTTY;
> diff --git a/drivers/firmware/efi/test/efi_test.h b/drivers/firmware/efi/test/efi_test.h
> index f2446aa1c2e3..117349e57993 100644
> --- a/drivers/firmware/efi/test/efi_test.h
> +++ b/drivers/firmware/efi/test/efi_test.h
> @@ -118,4 +118,7 @@ struct efi_resetsystem {
>  #define EFI_RUNTIME_RESET_SYSTEM \
>  	_IOW('p', 0x0B, struct efi_resetsystem)
> 
> +#define EFI_RUNTIME_GET_SUPPORTED_MASK \
> +	_IOR('p', 0x0C, unsigned int)
> +
>  #endif /* _DRIVERS_FIRMWARE_EFI_TEST_H_ */
> --
> 2.29.2
>