Hacking QEMU/KVM to use unused graphics adapters
I was curious if anyone thinks that it may be possible to get a KVM-patched QEMU to use a real video card? For example, let's say I had a second video card. Is QEMU/kvm a codebase which would support hacking in the ability to utilize this second video card (one not utilized by the host Linux)? And in the situation of a laptop, would it be possible to boot the host Linux in a way that it would not utilize the video card, but get a qemu guest to use it?
Theoretically, there's no reason this isn't possible, right?
Thanks,
- Tony
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Quoted 8 lines · Anthony de Almeida Lopes
I was curious if anyone thinks that it may be possible to get a KVM-patched QEMU to use a real video card? For example, let's say I had a second video card. Is QEMU/kvm a codebase which would support hacking in the ability to utilize this second video card (one not utilized by the host Linux)? And in the situation of a laptop, would it be possible to boot the host Linux in a way that it would not utilize the video card, but get a qemu guest to use it?
Theoretically, there's no reason this isn't possible, right?
We need something like a "PCI proxy" allowing to route some I/O to virtual PCI devices and others to real PCI devices. Moreover we must be able to inform host kernel to not manage a given PCI card (or be able to hot unplug it from host kernel PCI structures)
Laurent
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---------------- Laurent.Vivier-6ktuUTfB/[email protected] ----------------- "Given enough eyeballs, all bugs are shallow" E. S. Raymond
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Quoted 11 lines · Laurent Vivier
Quoted 8 lines · Anthony de Almeida Lopes
I was curious if anyone thinks that it may be possible to get a KVM-patched QEMU to use a real video card? For example, let's say I had a second video card. Is QEMU/kvm a codebase which would support hacking in the ability to utilize this second video card (one not utilized by the host Linux)? And in the situation of a laptop, would it be possible to boot the host Linux in a way that it would not utilize the video card, but get a qemu guest to use it?
Theoretically, there's no reason this isn't possible, right?
Quoted 8 lines
We need something like a "PCI proxy" allowing to route some I/O to virtual PCI
devices and others to real PCI devices. Moreover we must be able to inform host
kernel to not manage a given PCI card (or be able to hot unplug it from host
kernel PCI structures)
There is work in progress for pci pass through capability. Besides PCI it also required to have pv dma or 1-1 mapping between the guest and the host. Both will be released in the following month. NIC pass through works but I'm not sure about the features required from VGA pass through.
Dor.
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Quoted 20 lines · Dor Laor
Quoted 11 lines · Laurent Vivier
Quoted 8 lines · Anthony de Almeida Lopes
I was curious if anyone thinks that it may be possible to get a KVM-patched QEMU to use a real video card? For example, let's say I had a second video card. Is QEMU/kvm a codebase which would support hacking in the ability to utilize this second video card (one not utilized by the host Linux)? And in the situation of a laptop, would it be possible to boot the host Linux in a way that it would not utilize the video card, but get a qemu guest to use it?
Theoretically, there's no reason this isn't possible, right?Quoted 8 lines
We need something like a "PCI proxy" allowing to route some I/O to virtual PCI
devices and others to real PCI devices. Moreover we must be able to inform host
kernel to not manage a given PCI card (or be able to hot unplug it from host
kernel PCI structures)
Quoted 6 lines
There is work in progress for pci pass through capability. Besides PCI it also required to have pv dma or 1-1 mapping between the guest and the host. Both will be released in the following month. NIC pass through works but I'm
not sure about the features required from VGA pass through. Dor.
Perhaps if we use host IOMMU we don't need pv DMA ?
How do you say to host to not manage a PCI devices and let the guest managing it ?
Laurent
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---------------- Laurent.Vivier-6ktuUTfB/[email protected] ----------------- "Given enough eyeballs, all bugs are shallow" E. S. Raymond
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Quoted 7 lines · Laurent Vivier
Quoted 5 lines
There is work in progress for pci pass through capability. Besides PCI it also required to have pv dma or 1-1 mapping between the guest and the host. Both will be released in the following month. NIC pass through works but I'm not sure about the features required from VGA pass through. Dor.
Perhaps if we use host IOMMU we don't need pv DMA ?
Indeed, an IOMMU can provide the 1-1 mapping Dor mentioned above (or you can have both PV DMA and an IOMMU).
Quoted 2 lines
How do you say to host to not manage a PCI devices and let the guest managing it ?
If the host driver is modular, it might be enough to just not load (or unload) it.
Cheers,
Muli
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Quoted 20 lines · Muli Ben-Yehuda
Quoted 8 lines · Laurent Vivier
Quoted 6 lines
There is work in progress for pci pass through capability. Besides PCI it also required to have pv dma or 1-1 mapping between the guest and the host. Both will be released in the following month. NIC pass through works but I'm not sure about the features required from VGA pass through. Dor.
Perhaps if we use host IOMMU we don't need pv DMA ?
Indeed, an IOMMU can provide the 1-1 mapping Dor mentioned above (or you can have both PV DMA and an IOMMU).
Quoted 3 lines
How do you say to host to not manage a PCI devices and let the guest managing it ?
Quoted 6 lines
If the host driver is modular, it might be enough to just not load (or unload) it.
Cheers,
Muli
Thank you for your responses. I was curious, Dor, where could I take a look at this code?
I checked both sets of recent git logs and nothing popped out at me as being related. Is it still out-of-tree?
Thanks again,
- Tony
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I just read the ChangeLogs from kvm-47 to kvm-59 but I didn't notice anything that about PCI pass-through or any VGA work. I'm curious how things are going and what method was selected to accomplish this functionality?
- Tony
Quoted 53 lines · Dor Laor
It's still out-of -tree.
Not for long :)Quoted 47 lines · Anthony de Almeida Lopes
Quoted 15 lines · Muli Ben-Yehuda
Quoted 8 lines · Laurent Vivier
Quoted 6 lines
There is work in progress for pci pass through capability. Besides PCI it also required to have pv dma or 1-1 mapping between the guest and the host. Both will be released in the following month. NIC pass through works but I'm not sure about the features required from VGA pass through. Dor.
Perhaps if we use host IOMMU we don't need pv DMA ?
Indeed, an IOMMU can provide the 1-1 mapping Dor mentioned above (or you can have both PV DMA and an IOMMU).
Quoted 9 lines
Quoted 3 lines
How do you say to host to not manage a PCI devices and let the guest managing it ?
If the host driver is modular, it might be enough to just not load (or unload) it.
Cheers,
MuliThank you for your responses. I was curious, Dor, where could I take a look at this code?
I checked both sets of recent git logs and nothing popped out at me as being related. Is it still out-of-tree?Thanks again,
- Tony-------------------------------------------------------------------------
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Quoted 6 lines · Anthony de Almeida Lopes
I just read the ChangeLogs from kvm-47 to kvm-59 but I didn't notice anything that about PCI pass-through or any VGA work. I'm curious how things are going and what method was selected to accomplish this functionality?
- Tony
First we had plans only for plain PCI pass through and not VGA device that has some bios unification possible issues.
Second, we have it working (also all the code was sent to the list) but there's quick an effort to be done in order to merge it into mainline. We do want it to happen but we have some other issues on our plait. Nevertheless, if one wants to push it on
we'll be happy to assist.
Regards,
Dor
Quoted 42 lines
Quoted 41 lines · Dor Laor
It's still out-of -tree.
Not for long :)Quoted 37 lines · Anthony de Almeida Lopes
Quoted 15 lines · Muli Ben-Yehuda
Quoted 8 lines · Laurent Vivier
Quoted 6 lines
There is work in progress for pci pass through capability. Besides PCI it also required to have pv dma or 1-1 mapping between the guest and the host. Both will be released in the following month. NIC pass through works but I'm not sure about the features required from VGA pass through. Dor.
Perhaps if we use host IOMMU we don't need pv DMA ?
Indeed, an IOMMU can provide the 1-1 mapping Dor mentioned above (or you can have both PV DMA and an IOMMU).
Quoted 9 lines
Quoted 3 lines
How do you say to host to not manage a PCI devices and let the guest managing it ?
If the host driver is modular, it might be enough to just not load (or unload) it.
Cheers,
MuliThank you for your responses. I was curious, Dor, where could I take a look at this code?
I checked both sets of recent git logs and nothing popped out at me as being related. Is it still out-of-tree?Thanks again,
- Tony-------------------------------------------------------------------------
Quoted 13 lines
Quoted 12 lines
Quoted 10 lines
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