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SubjectRe: [Part2 PATCH v6 14/38] crypto: ccp: Implement SEV_FACTORY_RESET ioctl command
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On 10/19/2017 09:33 PM, Brijesh Singh wrote:
> The SEV_FACTORY_RESET command can be used by the platform owner to
> reset the non-volatile SEV related data. The command is defined in
> SEV spec section 5.4
>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: "Radim Krčmář" <rkrcmar@redhat.com>
> Cc: Borislav Petkov <bp@suse.de>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: Gary Hook <gary.hook@amd.com>
> Cc: Tom Lendacky <thomas.lendacky@amd.com>
> Cc: linux-crypto@vger.kernel.org
> Cc: kvm@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Improvements-by: Borislav Petkov <bp@suse.de>
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>

Acked-by: Gary R Hook <gary.hook@amd.com>

> ---
> drivers/crypto/ccp/psp-dev.c | 28 +++++++++++++++++++++++++++-
> 1 file changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
> index e9966d5fc6c4..99f3761206da 100644
> --- a/drivers/crypto/ccp/psp-dev.c
> +++ b/drivers/crypto/ccp/psp-dev.c
> @@ -176,7 +176,33 @@ static int sev_do_cmd(int cmd, void *data, int *psp_ret)
>
> static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
> {
> - return -ENOTTY;
> + void __user *argp = (void __user *)arg;
> + struct sev_issue_cmd input;
> + int ret = -EFAULT;
> +
> + if (ioctl != SEV_ISSUE_CMD)
> + return -EINVAL;
> +
> + if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
> + return -EFAULT;
> +
> + if (input.cmd > SEV_MAX)
> + return -EINVAL;
> +
> + switch (input.cmd) {
> +
> + case SEV_FACTORY_RESET:
> + ret = sev_do_cmd(SEV_CMD_FACTORY_RESET, 0, &input.error);
> + break;
> + default:
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
> + ret = -EFAULT;
> +out:
> + return ret;
> }
>
> static const struct file_operations sev_fops = {
>

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