From: Joerg Roedel <jroedel@suse.de>
To: Lenny Szubowicz <lszubowi@redhat.com>
Cc: "Uwe Kleine-König" <uwe@kleine-koenig.org>,
linux-kernel@vger.kernel.org, rafael.j.wysocki@intel.com,
tglx@linutronix.de, x86@kernel.org,
"Lu Baolu" <baolu.lu@linux.intel.com>
Subject: Re: Failure to shutdown/reboot with intel_iommu=on
Date: Tue, 12 May 2020 23:13:18 +0200 [thread overview]
Message-ID: <20200512211317.GG8135@suse.de> (raw)
In-Reply-To: <26b328dc-2161-fdaa-f533-bf0027c13efc@redhat.com>
Hi Lenny,
On Tue, May 12, 2020 at 04:00:26PM -0400, Lenny Szubowicz wrote:
> Some Lenovo laptops provide an ACPI DMAR RMRR that identifies the memory
> range that the kernel should open up for permissable DMA access
> for this purpose. Unfortunately, the PCI device that performs these
> DMA operations is hidden from the kernel by the BIOS. Given that the
> associated PCI device is hidden, the Linux kernel does not act upon
> the associated DMAR RMRR.
That sounds aweful. We should add to the VT-d driver that it sets up
RMRR mappings for request-ids which are not present as a PCI device, to
fix the Laptops which have it.
For the others, is the region the TPM talks to via DMA known so that we
can add a quirk?
Joerg
prev parent reply other threads:[~2020-05-12 21:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-06 14:46 Failure to shutdown/reboot with intel_iommu=on Uwe Kleine-König
2020-05-08 15:07 ` Joerg Roedel
2020-05-09 1:58 ` Lu Baolu
2020-05-11 19:59 ` Uwe Kleine-König
2020-05-11 20:16 ` Uwe Kleine-König
2020-05-11 13:43 ` Lenny Szubowicz
2020-05-11 19:58 ` Uwe Kleine-König
2020-05-12 13:34 ` Joerg Roedel
2020-05-12 20:00 ` Lenny Szubowicz
2020-05-12 21:13 ` Joerg Roedel [this message]
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