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Subject: Re: Failure to shutdown/reboot with intel_iommu=on
To:     Lu Baolu <baolu.lu@linux.intel.com>, Joerg Roedel <jroedel@suse.de>
Cc:     linux-kernel@vger.kernel.org, rafael.j.wysocki@intel.com,
        tglx@linutronix.de, x86@kernel.org
References: <20200506144558.GA4019@taurus.defre.kleine-koenig.org>
 <20200508150734.GP8135@suse.de>
 <bd9fb298-1ad3-fd4c-19f7-aae4c2b62daa@linux.intel.com>
From:   =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= <uwe@kleine-koenig.org>
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Message-ID: <11a3945a-f743-ac32-135c-1de026da66c9@kleine-koenig.org>
Date:   Mon, 11 May 2020 21:59:31 +0200
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From: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= <uwe@kleine-koenig.org>
To: Lu Baolu <baolu.lu@linux.intel.com>, Joerg Roedel <jroedel@suse.de>
Cc: linux-kernel@vger.kernel.org, rafael.j.wysocki@intel.com,
 tglx@linutronix.de, x86@kernel.org
Message-ID: <11a3945a-f743-ac32-135c-1de026da66c9@kleine-koenig.org>
Subject: Re: Failure to shutdown/reboot with intel_iommu=on
References: <20200506144558.GA4019@taurus.defre.kleine-koenig.org>
 <20200508150734.GP8135@suse.de>
 <bd9fb298-1ad3-fd4c-19f7-aae4c2b62daa@linux.intel.com>
In-Reply-To: <bd9fb298-1ad3-fd4c-19f7-aae4c2b62daa@linux.intel.com>

--HmNwS4eaVciVELKESsxF3anwMslmteeFd
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On 5/9/20 3:58 AM, Lu Baolu wrote:
> Hi Uwe,
>=20
> Have you tried commenting out intel_disable_iommus() in
> intel_iommu_shutdowan()?
>=20
> 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)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for_each_iommu(iommu, drhd)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 iommu_disable_protect_mem_regions(iommu);
>=20
> +#if 0
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Make sure the IOMMUs are =
switched off */
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 intel_disable_iommus();
> +#endif
>=20
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 up_write(&dmar_global_lock);=

> =C2=A0}

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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