linux-kernel - Re: [PATCH] iommu: fix compilation without CONFIG_IOMMU

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Date: Fri, 8 Mar 2024 09:40:30 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Bert Karwatzki <spasswolf@....de>
Cc: baolu.lu@...ux.intel.com, haifeng.zhao@...ux.intel.com,
 iommu@...ts.linux.dev, jgg@...pe.ca, jiaqing.huang@...el.com,
 joro@...tes.org, kevin.tian@...el.com, linux-kernel@...r.kernel.org,
 robin.murphy@....com, will@...nel.org
Subject: Re: [PATCH] iommu: fix compilation without CONFIG_IOMMU_INTEL

On 3/8/24 3:44 AM, Bert Karwatzki wrote:
> When the kernel is comiled with CONFIG_IRQ_REMAP=y but without
> CONFIG_IOMMU_INTEL compilation fails since commit def054b01a8678 with an
> undefined reference to device_rbtree_find(). This patch makes sure that
> intel specific code is only compiled with CONFIG_IOMMU_INTEL=y.
> 
> Fixes: def054b01a8678 ("iommu/vt-d: Use device rbtree in iopf reporting path")

I think it should fix below commit:

Fixes: 80a9b50c0b9e ("iommu/vt-d: Improve ITE fault handling if target 
device isn't present")

> 
> Signed-off-by: Bert Karwatzki<spasswolf@....de>

For users who want a configuration with interrupt remapping and without
DMA remapping, they can achieve this by selecting
IOMMU_DEFAULT_PASSTHROUGH or using kernel command "iommu.passthrough=1".

Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>

Best regards,
baolu