On 11/06/2017 12:11 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 <[email protected]>
> Cc: "Radim Krčmář" <[email protected]>
> Cc: Borislav Petkov <[email protected]>
> Cc: Herbert Xu <[email protected]>
> Cc: Gary Hook <[email protected]>
> Cc: Tom Lendacky <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
> Improvements-by: Borislav Petkov <[email protected]>
> Signed-off-by: Brijesh Singh <[email protected]>
Acked-by: Gary R Hook <[email protected]>
> ---
> drivers/crypto/ccp/psp-dev.c | 77 +++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 76 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
> index 9915a6c604a3..b49583a45a55 100644
> --- a/drivers/crypto/ccp/psp-dev.c
> +++ b/drivers/crypto/ccp/psp-dev.c
> @@ -232,9 +232,84 @@ static int sev_platform_shutdown(int *error)
> return rc;
> }
>
> +static int sev_get_platform_state(int *state, int *error)
> +{
> + int rc;
> +
> + rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS,
> + &psp_master->status_cmd_buf, error);
> + if (rc)
> + return rc;
> +
> + *state = psp_master->status_cmd_buf.state;
> + return rc;
> +}
> +
> +static int sev_ioctl_do_reset(struct sev_issue_cmd *argp)
> +{
> + int state, rc;
> +
> + /*
> + * The SEV spec requires that FACTORY_RESET must be issued in
> + * UNINIT state. Before we go further lets check if any guest is
> + * active.
> + *
> + * If FW is in WORKING state then deny the request otherwise issue
> + * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
> + *
> + */
> + rc = sev_get_platform_state(&state, &argp->error);
> + if (rc)
> + return rc;
> +
> + if (state == SEV_STATE_WORKING)
> + return -EBUSY;
> +
> + if (state == SEV_STATE_INIT) {
> + rc = __sev_platform_shutdown_locked(&argp->error);
> + if (rc)
> + return rc;
> + }
> +
> + return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, 0, &argp->error);
> +}
> +
> 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 (!psp_master)
> + return -ENODEV;
> +
> + 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;
> +
> + mutex_lock(&sev_cmd_mutex);
> +
> + switch (input.cmd) {
> +
> + case SEV_FACTORY_RESET:
> + ret = sev_ioctl_do_reset(&input);
> + break;
> + default:
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
> + ret = -EFAULT;
> +out:
> + mutex_unlock(&sev_cmd_mutex);
> +
> + return ret;
> }
>
> static const struct file_operations sev_fops = {
>
From 1583342216781371805@xxx Mon Nov 06 18:26:46 +0000 2017
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