Jeremie Le Hen
2008-Jan-15 09:01 UTC
[Xen-users] Purpose of the "ioemu" keyword: QEMU or IOMMU?
Hi list, Sorry for sending this question twice but as I said in my previous mail, the initial thread certainly lacked an appealing subject and contained too much text so most people simply didn''t spend time to read it. - About the "iommu" keyword: What''s the goal of the "ioemu" keyword used in FV guest configuration? I couldn''t find any documentation about all this. VBDs in my FV guests seems to work flawlessly both with or without it. Does this mean that Xen should use IOMMU (Intel''s VT-d) for this device, if present? Or does it mean it should use QEMU as backend? Again, any documentation pointer will be welcome. - VBD vs QEMU: What''s the benefit of using QEMU backend for a disk, instead of using a VBD? - VIF vs QEMU: BTW, I know that QEMU can emulate multiple ISA or PCI network adapters, is it possible to use them as for FV guests? What would be the benefit over a VIF? - IOMMU (Intel VT-d) implementation: BTW, are there any chipset that currently provide VT-d? If yes, according to [1] section 8, this shouldn''t be a big deal to implement it in Xen, so is it supported in Xen 3? Thank you. Best regards, [1] http://www.cl.cam.ac.uk/netos/papers/2004-oasis-ngio.pdf -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org > _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users