Re: [Part2 PATCH v6 15/38] crypto: ccp: Implement SEV_PLATFORM_STATUS ioctl command

[Gary R Hook]

On 10/19/2017 09:33 PM, Brijesh Singh wrote:

The SEV_PLATFORM_STATUS command can be used by the platform owner to
get the current status of the platform. The command is defined in
SEV spec section 5.5.

Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: "Radim Krčmář" <rkrc...@redhat.com>
Cc: Borislav Petkov <b...@suse.de>
Cc: Herbert Xu <herb...@gondor.apana.org.au>
Cc: Gary Hook <gary.h...@amd.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: linux-crypto@vger.kernel.org
Cc: k...@vger.kernel.org
Cc: linux-ker...@vger.kernel.org
Improvements-by: Borislav Petkov <b...@suse.de>
Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>

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

---
  drivers/crypto/ccp/psp-dev.c | 24 ++++++++++++++++++++++++
  1 file changed, 24 insertions(+)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 99f3761206da..5c921b36bc23 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -174,6 +174,27 @@ static int sev_do_cmd(int cmd, void *data, int *psp_ret)
        return ret;
  }

+static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)

+{
+       struct sev_user_data_status *data;
+       int ret;
+
+       data = kzalloc(sizeof(*data), GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       ret = sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
+       if (ret)
+               goto e_free;
+
+       if (copy_to_user((void __user *)argp->data, data, sizeof(*data)))
+               ret = -EFAULT;
+
+e_free:
+       kfree(data);
+       return ret;
+}
+
  static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long 
arg)
  {
        void __user *argp = (void __user *)arg;
@@ -194,6 +215,9 @@ static long sev_ioctl(struct file *file, unsigned int 
ioctl, unsigned long arg)
        case SEV_FACTORY_RESET:
                ret = sev_do_cmd(SEV_CMD_FACTORY_RESET, 0, &input.error);
                break;
+       case SEV_PLATFORM_STATUS:
+               ret = sev_ioctl_do_platform_status(&input);
+               break;
        default:
                ret = -EINVAL;
                goto out;