linux-kernel - [Patch] memory: tegra: Skip SID override from Guest VM

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Message-ID: <20240206114852.8472-1-sumitg@nvidia.com>
Date: Tue, 6 Feb 2024 17:18:52 +0530
From: Sumit Gupta <sumitg@...dia.com>
To: <treding@...dia.com>, <krzysztof.kozlowski@...aro.org>,
	<jonathanh@...dia.com>, <maz@...nel.org>, <mark.rutland@....com>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>
CC: <amhetre@...dia.com>, <bbasu@...dia.com>, <sumitg@...dia.com>
Subject: [Patch] memory: tegra: Skip SID override from Guest VM

MC SID register access is restricted for Guest VM.
So, skip the SID override programming from the Guest VM.

Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 drivers/memory/tegra/tegra186.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
index 1b3183951bfe..df441896b69d 100644
--- a/drivers/memory/tegra/tegra186.c
+++ b/drivers/memory/tegra/tegra186.c
@@ -10,6 +10,7 @@
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <asm/virt.h>
 
 #include <soc/tegra/mc.h>
 
@@ -118,6 +119,11 @@ static int tegra186_mc_probe_device(struct tegra_mc *mc, struct device *dev)
 	unsigned int i, index = 0;
 	u32 sid;
 
+	if (!is_kernel_in_hyp_mode()) {
+		dev_dbg(mc->dev, "Register access not allowed\n");
+		return 0;
+	}
+
 	if (!tegra_dev_iommu_get_stream_id(dev, &sid))
 		return 0;
 
@@ -146,6 +152,11 @@ static int tegra186_mc_resume(struct tegra_mc *mc)
 #if IS_ENABLED(CONFIG_IOMMU_API)
 	unsigned int i;
 
+	if (!is_kernel_in_hyp_mode()) {
+		dev_dbg(mc->dev, "Register access not allowed\n");
+		return 0;
+	}
+
 	for (i = 0; i < mc->soc->num_clients; i++) {
 		const struct tegra_mc_client *client = &mc->soc->clients[i];
 
-- 
2.17.1