linux-kernel - [Part2 PATCH v6 14/38] crypto: ccp: Implement SEV_FACTORY

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Message-Id: <20171020023413.122280-15-brijesh.singh@amd.com>
Date:   Thu, 19 Oct 2017 21:33:49 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     kvm@...r.kernel.org
Cc:     bp@...en8.de, Brijesh Singh <brijesh.singh@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Borislav Petkov <bp@...e.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Gary Hook <gary.hook@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [Part2 PATCH v6 14/38] crypto: ccp: Implement SEV_FACTORY_RESET ioctl command

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@...hat.com>
Cc: "Radim Krčmář" <rkrcmar@...hat.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Gary Hook <gary.hook@....com>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: linux-crypto@...r.kernel.org
Cc: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Improvements-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Brijesh Singh <brijesh.singh@....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 = {
-- 
2.9.5