On 21/12/2018 12:44, Roger Pau Monné wrote: > On Thu, Dec 20, 2018 at 11:40:52PM +0000, Andrew Cooper wrote: >> For development purposes, it is very convenient to boot Xen as a PVH guest, >> with an XTF PV or PVH "dom0". The edit-compile-go cycle is a matter of >> seconds, and you can resonably insert printk() debugging in places which >> which >> would be completely infeasible when booting fully-fledged guests. >> >> However, the PVH dom0 path insists on having a working IOMMU, which doesn't >> exist when virtualised as a PVH guest, and isn't necessary for XTF anyway. >> >> Introduce a developer mode to skip the IOMMU requirement. > This looks very similar to the current 'passthrough' option, maybe it > would be enough to allow PVH dom0 to use the passthrough option > provided a warning is added to > arch_iommu_check_autotranslated_hwdom?
I considered that, but "dom0-iommu=passthrough" isn't an accurate description of what is going on. Frankly, its not correct for PV either. TBH, dom0-iommu=none is better for both. How about I introduce that as the new option, and leave passthrough as a legacy alias? ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
