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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] VGA PASSTHROUGH not working :(
It is so odd. My CPU is "http://ark.intel.com/products/52214/Intel-Core-i7-2600K-Processor-8M-Cache-up-to-3_80-GHz" and information are : # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 42 model name : Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz stepping : 7 microcode : 0x17 cpu MHz : 3392.390 cache size : 8192 KB physical id : 0 siblings : 8 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu de tsc msr pae mce cx8 apic sep mca cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl nonstop_tsc eagerfpu pni pclmulqdq monitor est ssse3 cx16 sse4_1 sse4_2 popcnt tsc_deadline_timer aes xsave avx hypervisor lahf_lm ida arat epb pln pts dtherm xsaveopt bugs : bogomips : 6784.78 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: On Saturday, May 14, 2016 11:03 PM, "sm8ax1@xxxxxxxxxxx" <sm8ax1@xxxxxxxxxxx> wrote: Well, it looks to me like you don't have an IOMMU. You can check your Intel processor http://ark.intel.com/ and look for "VT-d" support. There is probably a similar site for AMD, but they call it "IOMMU" support; same thing just different names. There might also be some way to check through `lshw` or `/proc/cpuinfo` or the like, but I don't know for sure.
The wiki mentions that generic PCI passthrough might still work on some graphics cards, even without an IOMMU, but I imagine your chances are pretty slim. Something to try perhaps is setting up your HVM to automatically start when the system is booted, with generic PCI passthrough enabled, and blacklist the module on the Dom0 and reboot. In theory this prevents the Dom0 driver from interfering with the HVM's configuration of the graphics card, but once again, it might work or it might not. http://wiki.xen.org/wiki/Xen_VGA_Passthrough http://wiki.xen.org/wiki/VTdHowTo If that doesn't work, your options are buy a new PC/processor with an IOMMU, or use VNC, Spice, SDL, GTK, etc. with userspace frontends in the Dom0. Spice with the QXL video driver is likely to give you the best performance, but even it won't compete with that of VGA passthrough. http://wiki.xen.org/wiki/SPICE_support_in_Xen If you go the route of upgrading your hardware, XenGT (now called "GVT-v for Xen") is something else to look into. The idea behind it is to allow multiple VMs to simultaneously use VGA passthrough in a safe and performant manner by creating multiple virtual graphics cards at the hardware level. At least as of Jan 2015, XenGT is being developed out-of-tree, but I haven't followed up on it as to whether it's been merged (or abandoned). If I recall correctly, this is supported on Intel 6th generation and newer processors with Intel HD 6000+ graphics, but you should definitely double check that. http://wiki.xen.org/wiki/XenGT https://blog.xenproject.org/2014/03/11/xen-graphics-virtualization-xengt/ http://events.linuxfoundation.org/sites/events/files/slides/XenGT-LinuxCollaborationSummit-final_1.pdf There used to be something called "Paravirtualized DRM", which probably worked like the paravirtualized framebuffer, only using the newer and faster Linux DRM API. This, I guess, would have allowed multiple rendering clients across multiple VMs to directly render their window contents just as they would on baremetal (with the PV DRM driver acting as a shim), without any kind of VGA/PCI passthrough. Unfortunately this effort has been abandoned, and I've been unable to track down the author or even the original code. http://wiki.xen.org/wiki/Paravirtualized_DRM Quoting Jason Long <hack3rcon@xxxxxxxxx>:
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