From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: Haiwei Li <lihaiwei.kernel@gmail.com>
Cc: peter.maydell@linaro.org, ehabkost@redhat.com,
"Michael S. Tsirkin" <mst@redhat.com>,
richard.henderson@linaro.org, qemu-devel@nongnu.org,
shannon.zhaosl@gmail.com, qemu-arm@nongnu.org,
eric.auger@redhat.com, Paolo Bonzini <pbonzini@redhat.com>,
ani@anisinha.ca, imammedo@redhat.com
Subject: Re: [PATCH v4 00/11] virtio-iommu: Add ACPI support
Date: Mon, 11 Oct 2021 18:34:35 +0100 [thread overview]
Message-ID: <YWR1q1bL6a4e4a7v@myrica> (raw)
In-Reply-To: <CAB5KdOa4aLUq_d5RBws1cp_cfq55fw8_FhLY-HPV-1iVyFYKQQ@mail.gmail.com>
Hi Haiwei,
On Mon, Oct 11, 2021 at 06:10:07PM +0800, Haiwei Li wrote:
[...]
> Gave up waiting for root file system device. Common problems:
> - Boot args (cat /proc/cmdline)
> - Check rootdelay= (did the system wait long enough?)
> - Missing modules (cat /proc/modules; ls /dev)
> ALERT! UUID=3caf26b5-4d08-43e0-8634-7573269c4f70 does not exist.
> Dropping to a shell!
>
> Any suggestions? Thanks.
It's possible that the rootfs is on a disk behind the IOMMU, and the IOMMU
driver doesn't get loaded. That could happen, for example, if the
virtio-iommu module is not present in the initramfs. Since IOMMU drivers
are typically built into the kernel rather than modules, distro tools that
build the initramfs might not pick up IOMMU modules. I'm guessing this
could be the issue here because of the hints and "Dropping to a shell"
line.
The clean solution will be to patch the initramfs tools to learn about
IOMMU drivers (I'm somewhat working on that). In the meantime, if this is
indeed the problem, you could try explicitly adding the virtio-iommu
module to the initramfs, or building the kernel with CONFIG_VIRTIO_IOMMU=y
rather than =m, though that requires VIRTIO and VIRTIO_PCI to be built-in
as well.
Thanks,
Jean
next prev parent reply other threads:[~2021-10-11 17:36 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 17:33 [PATCH v4 00/11] virtio-iommu: Add ACPI support Jean-Philippe Brucker
2021-10-01 17:33 ` [PATCH v4 01/11] hw/acpi: Add VIOT table Jean-Philippe Brucker
2021-10-06 8:09 ` Igor Mammedov
2021-10-08 15:20 ` Jean-Philippe Brucker
2021-10-01 17:33 ` [PATCH v4 02/11] hw/arm/virt-acpi-build: Add VIOT table for virtio-iommu Jean-Philippe Brucker
2021-10-01 17:33 ` [PATCH v4 03/11] hw/arm/virt: Remove device tree restriction " Jean-Philippe Brucker
2021-10-05 11:57 ` Eric Auger
2021-10-08 15:20 ` Jean-Philippe Brucker
2021-10-01 17:33 ` [PATCH v4 04/11] hw/arm/virt: Reject instantiation of multiple IOMMUs Jean-Philippe Brucker
2021-10-06 6:35 ` Igor Mammedov
2021-10-01 17:33 ` [PATCH v4 05/11] hw/arm/virt: Use object_property_set instead of qdev_prop_set Jean-Philippe Brucker
2021-10-05 9:27 ` Eric Auger
2021-10-06 6:36 ` Igor Mammedov
2021-10-01 17:33 ` [PATCH v4 06/11] hw/i386: Move vIOMMU uniqueness check into pc.c Jean-Philippe Brucker
2021-10-05 11:41 ` Eric Auger
2021-10-01 17:33 ` [PATCH v4 07/11] pc: Allow instantiating a virtio-iommu device Jean-Philippe Brucker
2021-10-05 19:18 ` Eric Auger
2021-10-06 7:19 ` Igor Mammedov
2021-10-08 15:24 ` Jean-Philippe Brucker
2021-10-08 10:46 ` Michael S. Tsirkin
2021-10-01 17:33 ` [PATCH v4 08/11] tests/acpi: allow updates of VIOT expected data files Jean-Philippe Brucker
2021-10-06 8:12 ` Igor Mammedov
2021-10-08 15:26 ` Jean-Philippe Brucker
2021-10-11 15:55 ` Igor Mammedov
2021-10-01 17:33 ` [PATCH v4 09/11] tests/acpi: add test cases for VIOT Jean-Philippe Brucker
2021-10-05 10:27 ` Ani Sinha
2021-10-08 15:27 ` Jean-Philippe Brucker
2021-10-05 19:40 ` Eric Auger
2021-10-06 8:14 ` Igor Mammedov
2021-10-01 17:33 ` [PATCH v4 10/11] tests/acpi: add expected blob for VIOT test on virt machine Jean-Philippe Brucker
2021-10-05 10:04 ` Ani Sinha
2021-10-08 15:33 ` Jean-Philippe Brucker
2021-10-05 19:38 ` Eric Auger
2021-10-08 15:30 ` Jean-Philippe Brucker
2021-10-01 17:33 ` [PATCH v4 11/11] tests/acpi: add expected blobs for VIOT test on q35 machine Jean-Philippe Brucker
2021-10-05 10:07 ` Ani Sinha
2021-10-05 19:41 ` Eric Auger
2021-10-05 15:45 ` [PATCH v4 00/11] virtio-iommu: Add ACPI support Michael S. Tsirkin
2021-10-08 15:17 ` Jean-Philippe Brucker
2021-10-11 10:10 ` Haiwei Li
2021-10-11 17:34 ` Jean-Philippe Brucker [this message]
2021-10-13 0:56 ` Haiwei Li
2021-10-18 15:25 ` Michael S. Tsirkin
2021-10-19 15:39 ` Jean-Philippe Brucker
2021-10-20 15:17 ` Michael S. Tsirkin
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