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| author | Jean-Philippe Brucker <jean-philippe@linaro.org> | 2022-02-14 12:43:54 +0000 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-03-06 05:08:23 -0500 |
| commit | 448179e33ea850acaf4bd3c2410acc911080e40b (patch) | |
| tree | 063009ae14d154209287f7c01a4bee823a43d0c4 /python/qemu/utils/qemu_ga_client.py | |
| parent | 9919423516ddf0519df965184e236ba74fa236b1 (diff) | |
| download | focaccia-qemu-448179e33ea850acaf4bd3c2410acc911080e40b.tar.gz focaccia-qemu-448179e33ea850acaf4bd3c2410acc911080e40b.zip | |
virtio-iommu: Default to bypass during boot
Currently the virtio-iommu device must be programmed before it allows DMA from any PCI device. This can make the VM entirely unusable when a virtio-iommu driver isn't present, for example in a bootloader that loads the OS from storage. Similarly to the other vIOMMU implementations, default to DMA bypassing the IOMMU during boot. Add a "boot-bypass" property, defaulting to true, that lets users change this behavior. Replace the VIRTIO_IOMMU_F_BYPASS feature, which didn't support bypass before feature negotiation, with VIRTIO_IOMMU_F_BYPASS_CONFIG. We add the bypass field to the migration stream without introducing subsections, based on the assumption that this virtio-iommu device isn't being used in production enough to require cross-version migration at the moment (all previous version required workarounds since they didn't support ACPI and boot-bypass). Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Message-Id: <20220214124356.872985-3-jean-philippe@linaro.org> Acked-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Tested-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'python/qemu/utils/qemu_ga_client.py')
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