From: "Hook, Gary" <Gary.Hook@amd.com>
Date: Mon, 21 Oct 2019 13:44:44 +0000
Subject: crypto: ccp - Verify access to device registers before initializing
Git-commit: 03f008c52b76114b83483de2cf15ed36fc34930c
Patch-mainline: v5.5-rc1
References: bsc#1161073

Check early whether device registers can be accessed. Some BIOSes have
a broken security policy that prevents access to the device registers,
and return values from ioread() can be misinterpreted. If a read of
a feature register returns a -1, we may not be able to access
any device register, so report the problem and suggestion, and return.

For the PSP, the feature register is checked. For the CCP, the queue
register is checked.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Borislav Petkov <bp@suse.de>
---
 drivers/crypto/ccp/ccp-dev-v5.c |   12 ++++++++++++
 drivers/crypto/ccp/psp-dev.c    |   18 ++++++++++++++++--
 2 files changed, 28 insertions(+), 2 deletions(-)

--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -792,6 +792,18 @@ static int ccp5_init(struct ccp_device *
 
 	/* Find available queues */
 	qmr = ioread32(ccp->io_regs + Q_MASK_REG);
+	/*
+	 * Check for a access to the registers.  If this read returns
+	 * 0xffffffff, it's likely that the system is running a broken
+	 * BIOS which disallows access to the device. Stop here and fail
+	 * the initialization (but not the load, as the PSP could get
+	 * properly initialized).
+	 */
+	if (qmr == 0xffffffff) {
+		dev_notice(dev, "ccp: unable to access the device: you might be running a broken BIOS.\n");
+		return 1;
+	}
+
 	for (i = 0; i < MAX_HW_QUEUES; i++) {
 
 		if (!(qmr & (1 << i)))
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -929,8 +929,22 @@ static int sev_misc_init(struct psp_devi
 
 static int psp_check_sev_support(struct psp_device *psp)
 {
-	/* Check if device supports SEV feature */
-	if (!(ioread32(psp->io_regs + psp->vdata->feature_reg) & 1)) {
+	unsigned int val = ioread32(psp->io_regs + psp->vdata->feature_reg);
+
+	/*
+	 * Check for a access to the registers.  If this read returns
+	 * 0xffffffff, it's likely that the system is running a broken
+	 * BIOS which disallows access to the device. Stop here and
+	 * fail the PSP initialization (but not the load, as the CCP
+	 * could get properly initialized).
+	 */
+	if (val == 0xffffffff) {
+		dev_notice(psp->dev, "psp: unable to access the device: you might be running a broken BIOS.\n");
+		return -ENODEV;
+	}
+
+	if (!(val & 1)) {
+		/* Device does not support the SEV feature */
 		dev_dbg(psp->dev, "psp does not support SEV\n");
 		return -ENODEV;
 	}