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]> --- Changes since v5.1: * rename sev_handle_cmd -> sev_do_cmd (from Boris) * skip copy_to_user when invalid cmd id is passed (from Boris) * use SEV_MAX instead of SEV_CMD_MAX to check for invalid command drivers/crypto/ccp/psp-dev.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c index 175cb3c3b8ef..a9c885a39910 100644 --- a/drivers/crypto/ccp/psp-dev.c +++ b/drivers/crypto/ccp/psp-dev.c @@ -179,7 +179,34 @@ 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 = { -- 2.9.5
