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Message-ID: <YFCvsort3oZGfDBy@suse.de>
Date: Tue, 16 Mar 2021 14:16:34 +0100
From: Joerg Roedel <jroedel@...e.de>
To: Huang Rui <ray.huang@....com>
Cc: iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
Joerg Roedel <joro@...tes.org>,
Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
Alex Deucher <alexander.deucher@....com>,
Xiaojian Du <xiaojian.du@....com>, stable@...r.kernel.org
Subject: Re: [PATCH] iommu/amd: Fix iommu remap panic while amd_iommu is set
to disable
Hi Huang,
On Thu, Mar 11, 2021 at 10:28:07PM +0800, Huang Rui wrote:
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index f0adbc48fd17..a08e885403b7 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -3862,7 +3862,7 @@ static int irq_remapping_select(struct irq_domain *d, struct irq_fwspec *fwspec,
> else if (x86_fwspec_is_hpet(fwspec))
> devid = get_hpet_devid(fwspec->param[0]);
>
> - if (devid < 0)
> + if (devid < 0 || !amd_iommu_rlookup_table)
> return 0;
The problem is deeper than this fix suggests. I prepared other fixes for
this particular problem. Please find them here:
https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=iommu-fixes
Regards,
Joerg
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