> On 05-Jun-2017, at 10:19 PM, ron minnich <rminn...@gmail.com> wrote: > > The reason I ask about what you need is that on chromebooks the main coreboot > support came down to 'don't disable anything’.
I think its can’t just be disabled. Its just that kernel is not given any knowledge about its existence. This is what I want to know. The commercial BIOSes give an option of “enable VT-d” support. What do they do when this option is selected? Can this be implemented in Coreboot? This probably brings me to your next question of what is required. I would spend some time to figure that out. > > The DMAR requirements are not met on all platforms. But even after boot you > can insert DMAR tables into kernels. > > So there is a key distinction between required support and desired support, > and I wonder if you could figure out what is required and let us know what it > is. > > BTW, Do we have core boot tested on Intel’s Atom based C3xxx family SoCs? > > On Mon, Jun 5, 2017 at 9:39 AM Zoran Stojsavljevic > <zoran.stojsavlje...@gmail.com> wrote: > > what support does it need? > > Intel Virtualization Technology for Directed I/O" (VT-d). VT-d is a > virtualized IOMMU, so by using HYP type 1 there should be a VT-d driver > supporting VT-d HW extension (?), as my best understanding is > > The practical implications are Graphics and Network Connectivity in Guests. > DMA Remapping is the feature of VT-d. > > Good net pointer to read: > https://unix.stackexchange.com/questions/34428/do-virtualbox-or-vmware-use-the-intel-vt-d-feature > > > Is anybody working on this? > > Don't think so... If anything is done, I guess, it is done by simplistic > implementation of the feature called: pass-through (so guest by its own > drivers is using directly platform devices' HW bypassing HYP1, my best guess). > > Zoran > On Mon, Jun 5, 2017 at 6:11 PM, ron minnich <rminn...@gmail.com> wrote: > > > On Mon, Jun 5, 2017 at 9:00 AM Himanshu Chauhan <hschau...@nulltrace.org> > wrote: > Hi, > > VT-d requires support from BIOS. Does coreboot support VT-d? > > > > what support does it need? > > -- > coreboot mailing list: coreboot@coreboot.org > https://mail.coreboot.org/mailman/listinfo/coreboot -- coreboot mailing list: coreboot@coreboot.org https://mail.coreboot.org/mailman/listinfo/coreboot
