Re: device passthrough
* Mu Lin (m...@juniper.net) wrote: Is there any method to directly assign a device to Guest OS without VT-d? Assuming you mean a PCI device, no, there isn't. Without an IOMMU[1] you can't directly assign a PCI device to a guest (nor is it safe). There have been patches floating around to allow this, but they don't maintain secure isolation. thanks, -chris [1] VT-d is an Intel chipset feature, so you could certainly do it on an AMD platform that has an AMD IOMMU. -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
RE: device passthrough
Thanks, Chris, Do you know where is the patch, I just need something quick and dirty for now, my shining new board does have VT-d but the BIOS is not ready yet, I want to have something working now. Mu -Original Message- From: Chris Wright [mailto:chr...@sous-sol.org] Sent: Friday, May 28, 2010 12:33 PM To: Mu Lin Cc: kvm@vger.kernel.org Subject: Re: device passthrough * Mu Lin (m...@juniper.net) wrote: Is there any method to directly assign a device to Guest OS without VT-d? Assuming you mean a PCI device, no, there isn't. Without an IOMMU[1] you can't directly assign a PCI device to a guest (nor is it safe). There have been patches floating around to allow this, but they don't maintain secure isolation. thanks, -chris [1] VT-d is an Intel chipset feature, so you could certainly do it on an AMD platform that has an AMD IOMMU. -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: device passthrough
* Mu Lin (m...@juniper.net) wrote: Do you know where is the patch, I just need something quick and dirty for now, my shining new board does have VT-d but the BIOS is not ready yet, I want to have something working now. Sorry, I don't have a handy pointer. You can search for either pv dma changes (paravirtualizing the guest's request for dma addrs so that it gets host physical addr to program card for dma) or reserved-ram for pci-passthrough (1:1 mapping of guest to host physical memory). I don't recall a recent attempt to bring them forward, so expect anything you find to be quite stale. thanks, -chris -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
