From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: Jacob Pan <jacob.pan@linux.microsoft.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
Robin Murphy <robin.murphy@arm.com>,
virtualization@lists.linux.dev, Will Deacon <will@kernel.org>,
Eric Auger <eric.auger@redhat.com>,
patches@lists.linux.dev
Subject: Re: [PATCH 0/5] Convert virtio-iommu to domain_alloc_paging()
Date: Wed, 12 Feb 2025 19:16:03 +0000 [thread overview]
Message-ID: <20250212191603.GA4085684@myrica> (raw)
In-Reply-To: <67acd4e2.630a0220.365aab.e098SMTPIN_ADDED_BROKEN@mx.google.com>
On Wed, Feb 12, 2025 at 09:05:35AM -0800, Jacob Pan wrote:
> > Does reproducing this require
> > modifying QEMU or Linux to disable support for F_BYPASS_CONFIG, or
> > just passing QEMU/kernel parameters?
> I only modified guest code to pretend F_BYPASS_CONFIG is not supported,
> a couple of places like:
>
> - if (virtio_has_feature(viommu->vdev,
> VIRTIO_IOMMU_F_BYPASS_CONFIG)) {
> + if (!virtio_has_feature(viommu->vdev,
> VIRTIO_IOMMU_F_BYPASS_CONFIG)) {
>
> Is there a QEMU command line option to disable
> VIRTIO_IOMMU_F_BYPASS_CONFIG?
No, but I have a patch for testing that didn't seem worth upstreaming:
https://jpbrucker.net/git/qemu/commit/?h=virtio-iommu/bypass&id=ab2f435576a95914d2939ef4f0b190548721fe7b
With it I'm able to reproduce the issue, looks like I only tested this
case with virtual devices and not VFIO. I'll look for a fix
Thanks,
Jean
prev parent reply other threads:[~2025-02-12 19:15 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-07 14:46 [PATCH 0/5] Convert virtio-iommu to domain_alloc_paging() Jason Gunthorpe
2025-02-07 14:46 ` [PATCH 1/5] iommu/virtio: Break out bypass identity support into a global static Jason Gunthorpe
2025-02-12 0:43 ` Jacob Pan
2025-02-18 18:21 ` Jason Gunthorpe
2025-02-21 11:35 ` Jean-Philippe Brucker
2025-02-24 19:37 ` Jason Gunthorpe
2025-02-07 14:46 ` [PATCH 2/5] iommu: Add domain_alloc_identity() Jason Gunthorpe
2025-02-12 13:56 ` Robin Murphy
2025-02-12 14:03 ` Jason Gunthorpe
2025-02-12 14:16 ` Robin Murphy
2025-02-12 14:45 ` Jason Gunthorpe
2025-02-07 14:46 ` [PATCH 3/5] iommu/virtio: Move to domain_alloc_paging() Jason Gunthorpe
2025-02-12 19:22 ` Jacob Pan
2025-02-12 23:30 ` Jason Gunthorpe
2025-02-13 5:47 ` Jacob Pan
2025-02-18 20:01 ` Jason Gunthorpe
[not found] ` <67ad876d.170a0220.3c21dc.85ceSMTPIN_ADDED_BROKEN@mx.google.com>
2025-02-13 9:46 ` Jean-Philippe Brucker
2025-02-13 17:03 ` Yu Zhang
2025-02-13 18:09 ` Jean-Philippe Brucker
2025-02-19 9:39 ` Yu Zhang
2025-02-19 10:35 ` Jean-Philippe Brucker
2025-02-19 11:11 ` Yu Zhang
2025-02-19 11:57 ` Jean-Philippe Brucker
2025-02-19 13:10 ` Yi Liu
2025-02-20 2:58 ` Baolu Lu
2025-02-20 3:44 ` Yu Zhang
2025-02-07 14:46 ` [PATCH 4/5] iommu: Do not call domain_alloc() in iommu_sva_domain_alloc() Jason Gunthorpe
2025-02-07 14:46 ` [PATCH 5/5] iommu: Hide ops.domain_alloc behind CONFIG_FSL_PAMU Jason Gunthorpe
2025-02-12 0:41 ` [PATCH 0/5] Convert virtio-iommu to domain_alloc_paging() Jacob Pan
2025-02-12 12:50 ` Jason Gunthorpe
2025-02-12 18:50 ` Jacob Pan
2025-02-12 20:10 ` Robin Murphy
2025-02-21 11:42 ` Jean-Philippe Brucker
2025-02-24 19:39 ` Jason Gunthorpe
[not found] ` <67abee53.170a0220.154671.ae28SMTPIN_ADDED_BROKEN@mx.google.com>
2025-02-12 11:58 ` Jean-Philippe Brucker
2025-02-12 17:05 ` Jacob Pan
[not found] ` <67acd4e2.630a0220.365aab.e098SMTPIN_ADDED_BROKEN@mx.google.com>
2025-02-12 19:16 ` Jean-Philippe Brucker [this message]
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