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Message-ID: <2df227df-8bd4-44f1-a361-15b43aea0b47@linaro.org>
Date: Tue, 6 Feb 2024 13:00:44 +0100
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Subject: Re: [Patch] memory: tegra: Skip SID override from Guest VM
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To: Sumit Gupta <sumitg@nvidia.com>, treding@nvidia.com,
 jonathanh@nvidia.com, maz@kernel.org, mark.rutland@arm.com,
 linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org
Cc: amhetre@nvidia.com, bbasu@nvidia.com
References: <20240206114852.8472-1-sumitg@nvidia.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20240206114852.8472-1-sumitg@nvidia.com>
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On 06/02/2024 12:48, Sumit Gupta wrote:
> 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@nvidia.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>

Are you sure this still compile tests?

>  
>  #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");

Doesn't this depend on hypervisor?

> +		return 0;
> +	}
> +
>  	if (!tegra_dev_iommu_get_stream_id(dev, &sid))
>  		return 0;

Best regards,
Krzysztof