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Re: cleanup swiotlb initialization
- To: Christoph Hellwig <hch@xxxxxx>
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Fri, 25 Feb 2022 10:24:06 -0500
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- Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, tboot-devel@xxxxxxxxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx
- Delivery-date: Fri, 25 Feb 2022 15:26:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2/25/22 3:47 AM, Christoph Hellwig wrote:
On Thu, Feb 24, 2022 at 12:07:26PM -0500, Boris Ostrovsky wrote:
Just to be clear: this crashes only as dom0. Boots fine as baremetal.
Ah. I can gues what this might be. On Xen the hypervisor controls the
IOMMU and we should never end up initializing it in Linux, right?
Right, we shouldn't be in that code path.
Can you try the patch below on top of the series?
Yes, this makes dom0 boot fine.
(It also addresses something I wanted to mention while looking at the patches,
which was to remove Xen initialization code from pci_swiotlb_detect_4gb() since
it had noting to do with what the routine's name implies.)
-boris
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