linux-kernel - Re: Failure to shutdown/reboot with intel

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Date:   Mon, 11 May 2020 21:59:31 +0200
From:   Uwe Kleine-König <uwe@...ine-koenig.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <jroedel@...e.de>
Cc:     linux-kernel@...r.kernel.org, rafael.j.wysocki@...el.com,
        tglx@...utronix.de, x86@...nel.org
Subject: Re: Failure to shutdown/reboot with intel_iommu=on

On 5/9/20 3:58 AM, Lu Baolu wrote:
> Hi Uwe,
> 
> Have you tried commenting out intel_disable_iommus() in
> intel_iommu_shutdowan()?
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 0182cff2c7ac..532e62600f95 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -4928,8 +4928,10 @@ void intel_iommu_shutdown(void)
>         for_each_iommu(iommu, drhd)
>                 iommu_disable_protect_mem_regions(iommu);
> 
> +#if 0
>         /* Make sure the IOMMUs are switched off */
>         intel_disable_iommus();
> +#endif
> 
>         up_write(&dmar_global_lock);
>  }

I just tested that and it didn't help. The machine still hangs with the
same symptoms as reported before.

Best regards
Uwe



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