Re: VGA pass through and AHCI emulation status
On 08.07.2011, at 10:25, Piwko, Maciej wrote: Hi, We are currently working on passing primary VGA to GOS and checking AHCI emulation. Therefore we are facing problem with that tasks. My questions are: 1. What is the status of VGA pass-through? Are there any known issues with that? Are there any fixes/patches on the way? Better don't hold your breath here. 2. AHCI emulation works fine - but only in Linux GOS. Unfortunately we would like to run it in FreeBSD. The controller is seen but no drive can be detected. Therefore my question is: What is the status of this emulation? Are there any known issues? Are there any patches/fixes on the way? AHCI emulation works with all guests I've tested so far except for one BSD flavor. I guess it was FreeBSD then :). The FreeBSD driver does some very awkward things, loading the AHCI driver only if it detects an ICH IDE controller. I debugged it for about a day and then just gave up on it, as we do have some pretty skilled FreeBSD developers in the community and I was hoping they'd just take a look at it :). If you're interested in getting AHCI to work with FreeBSD, I'd be more than happy to review your patches :). Alex PS: Device emulation mails should always go to qemu-devel, as that's the project developing them. The KVM list is mainly for KVM specific code (like device passthrough for now), but AHCI definitely belongs to the qemu category. -- 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: VGA pass-through
Currently VGA pass-through is not supported in KVM. It needs much work to support it. Here's what I know of: - load the vga bios at 0xc - implement whatever main bios interfaces the vga vios expects - pass through the vga I/O ports I think it also needs: - map video RAM: 0xa - 0xb - remove Qemu VGA device emulation - reserve enough guest memory space for PCI BARs (most graphics cards has more than 256M memory, I didn't check how much guest memory kvm reserve for PCI BARs) In addition, some graphics cards are specific, such as pBAR must equal to vBAR. To my feeling, there are some tricks to make it work. Hi All, Out of curiosity, has any progress been made on this? I tried to set this up myself several months ago (KVM-84) with no luck as primary or secondary. No matter what I did, if I passed through a video card, kvm wouldn't even enter the bios. Presumably because of vga bios issues. I even hacked the nvidia driver on my host system to make certain that the host didn't touch the card at all. Thanks, Nate -- 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: VGA pass-through
nathan binkert wrote: Currently VGA pass-through is not supported in KVM. It needs much work to support it. Here's what I know of: - load the vga bios at 0xc - implement whatever main bios interfaces the vga vios expects - pass through the vga I/O ports I think it also needs: - map video RAM: 0xa - 0xb - remove Qemu VGA device emulation - reserve enough guest memory space for PCI BARs (most graphics cards has more than 256M memory, I didn't check how much guest memory kvm reserve for PCI BARs) In addition, some graphics cards are specific, such as pBAR must equal to vBAR. To my feeling, there are some tricks to make it work. Hi All, Out of curiosity, has any progress been made on this? I tried to set this up myself several months ago (KVM-84) with no luck as primary or secondary. No matter what I did, if I passed through a video card, kvm wouldn't even enter the bios. Presumably because of vga bios issues. I even hacked the nvidia driver on my host system to make certain that the host didn't touch the card at all. If you didn't do above changes, obviously it won't work directly. We are working on VGA passthrough on Xen side now. KVM should be similiar. Basically we can reuse most of the code. We will post the code when we port it to KVM. Regards, Weidong -- 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: VGA pass-through
Subash Kalbarga wrote: Hi I am using kvm-86 on 2.6.28 and I am able to pass through most of my PCI devices successfully. However, I do not see even the KVM BIOS output if I pass through my VGA adapter. I am doing -vga none, -nographic and -pcidevice host=xx:yy.z Should I expect to see the kvm BIOS output? Is VGA pass-through something that is expected to work? Currently VGA pass-through is not supported in KVM. It needs much work to support it. Regards, Weidong Thanks in advance. Subash -- 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: VGA pass-through
On 06/30/2009 09:16 AM, Han, Weidong wrote: Subash Kalbarga wrote: Hi I am using kvm-86 on 2.6.28 and I am able to pass through most of my PCI devices successfully. However, I do not see even the KVM BIOS output if I pass through my VGA adapter. I am doing -vga none, -nographic and -pcidevice host=xx:yy.z Should I expect to see the kvm BIOS output? Is VGA pass-through something that is expected to work? Currently VGA pass-through is not supported in KVM. It needs much work to support it. What does it need? Here's what I know of: - load the vga bios at 0xc - implement whatever main bios interfaces the vga vios expects - pass through the vga I/O ports Anything else? -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- 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: VGA pass-through
Avi Kivity wrote: On 06/30/2009 09:16 AM, Han, Weidong wrote: Subash Kalbarga wrote: Hi I am using kvm-86 on 2.6.28 and I am able to pass through most of my PCI devices successfully. However, I do not see even the KVM BIOS output if I pass through my VGA adapter. I am doing -vga none, -nographic and -pcidevice host=xx:yy.z Should I expect to see the kvm BIOS output? Is VGA pass-through something that is expected to work? Currently VGA pass-through is not supported in KVM. It needs much work to support it. What does it need? Here's what I know of: - load the vga bios at 0xc - implement whatever main bios interfaces the vga vios expects - pass through the vga I/O ports Anything else? I think it also needs: - map video RAM: 0xa - 0xb - remove Qemu VGA device emulation - reserve enough guest memory space for PCI BARs (most graphics cards has more than 256M memory, I didn't check how much guest memory kvm reserve for PCI BARs) In addition, some graphics cards are specific, such as pBAR must equal to vBAR. To my feeling, there are some tricks to make it work. Regards, Weidong -- 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: VGA pass-through
Han, Weidong wrote: [] Currently VGA pass-through is not supported in KVM. It needs much work to support it. What does it need? Here's what I know of: - load the vga bios at 0xc - implement whatever main bios interfaces the vga vios expects - pass through the vga I/O ports Anything else? I think it also needs: - map video RAM: 0xa - 0xb - remove Qemu VGA device emulation - reserve enough guest memory space for PCI BARs (most graphics cards has more than 256M memory, I didn't check how much guest memory kvm reserve for PCI BARs) In addition, some graphics cards are specific, such as pBAR must equal to vBAR. To my feeling, there are some tricks to make it work. That all seems to be necessary for console support, i.e., so that the guest bios etc will know this device as primary display or whatever it is called. But how about using it as a secondary video card? Like, I can plug another add-on vga card into a free PCI slot and tell X to use that one instead of default card. Can kvm work like this? Thanks. /mjt -- 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: VGA pass-through
Michael Tokarev wrote: Han, Weidong wrote: [] Currently VGA pass-through is not supported in KVM. It needs much work to support it. What does it need? Here's what I know of: - load the vga bios at 0xc - implement whatever main bios interfaces the vga vios expects - pass through the vga I/O ports Anything else? I think it also needs: - map video RAM: 0xa - 0xb - remove Qemu VGA device emulation - reserve enough guest memory space for PCI BARs (most graphics cards has more than 256M memory, I didn't check how much guest memory kvm reserve for PCI BARs) In addition, some graphics cards are specific, such as pBAR must equal to vBAR. To my feeling, there are some tricks to make it work. That all seems to be necessary for console support, i.e., so that the guest bios etc will know this device as primary display or whatever it is called. But how about using it as a secondary video card? Like, I can plug another add-on vga card into a free PCI slot and tell X to use that one instead of default card. Can kvm work like this? secondary means secondary video card in host, and will be primary in guest, right? As long as it's primary in guest, I think you still need most of above changes. Regards, Weidong Thanks. /mjt -- 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: VGA pass-through
Han, Weidong wrote: Michael Tokarev wrote: [] But how about using it as a secondary video card? Like, I can plug another add-on vga card into a free PCI slot and tell X to use that one instead of default card. Can kvm work like this? secondary means secondary video card in host, and will be primary in guest, right? As long as it's primary in guest, I think you still need most of above changes. No, I mean secondary on guest - no matter if it's secondary or primary on host. So that we'll have qemu-emulated VGA as primary and a hardware-based secondary on *guest*. How much useful it is - it's another question. For instance, I've no idea how windows guest will be able to use such secondary vga card on guest. /mjt -- 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: VGA pass-through
Michael Tokarev wrote: Han, Weidong wrote: Michael Tokarev wrote: [] But how about using it as a secondary video card? Like, I can plug another add-on vga card into a free PCI slot and tell X to use that one instead of default card. Can kvm work like this? secondary means secondary video card in host, and will be primary in guest, right? As long as it's primary in guest, I think you still need most of above changes. No, I mean secondary on guest - no matter if it's secondary or primary on host. So that we'll have qemu-emulated VGA as primary and a hardware-based secondary on *guest*. Oh, for secondary in guest, it may needn't above changes. You can try it without any change. How much useful it is - it's another question. For instance, I've no idea how windows guest will be able to use such secondary vga card on guest. I don't know. Is there any interesting usage of this secondary VGA in guest? Regards, Weidong-- 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: VGA pass-through
Han, Weidong wrote: Michael Tokarev wrote: Han, Weidong wrote: Michael Tokarev wrote: [] But how about using it as a secondary video card? Like, I can plug another add-on vga card into a free PCI slot and tell X to use that one instead of default card. Can kvm work like this? secondary means secondary video card in host, and will be primary in guest, right? As long as it's primary in guest, I think you still need most of above changes. No, I mean secondary on guest - no matter if it's secondary or primary on host. So that we'll have qemu-emulated VGA as primary and a hardware-based secondary on *guest*. Oh, for secondary in guest, it may needn't above changes. You can try it without any change. I can't: ENOHARDWARE. How much useful it is - it's another question. For instance, I've no idea how windows guest will be able to use such secondary vga card on guest. I don't know. Is there any interesting usage of this secondary VGA in guest? I *guess* windows can be told to use non-primary display. But I've no idea how. Also, it certainly supports multi-display configuration somehow. Running most stuff on secondary should be possible. /mjt -- 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: VGA pass-through
Thanks for all the replies. I do have the extra hardware, but I am right now not able to put both together on the guest (i.e. I have to use -vga none while passing through the nvidia card that I have) because the VGA I am trying to pass through has an option rom and hw/device-assignment.c complains about not having enough option ROM space if both VGAs are included. I should be able to try something out after some fussing in this particular area Thanks Subash -Original Message- From: Michael Tokarev [mailto:m...@tls.msk.ru] Sent: Tuesday, June 30, 2009 9:34 AM To: Han, Weidong Cc: 'Avi Kivity'; Subash Kalbarga; 'kvm@vger.kernel.org' Subject: Re: VGA pass-through Han, Weidong wrote: Michael Tokarev wrote: Han, Weidong wrote: Michael Tokarev wrote: [] But how about using it as a secondary video card? Like, I can plug another add-on vga card into a free PCI slot and tell X to use that one instead of default card. Can kvm work like this? secondary means secondary video card in host, and will be primary in guest, right? As long as it's primary in guest, I think you still need most of above changes. No, I mean secondary on guest - no matter if it's secondary or primary on host. So that we'll have qemu-emulated VGA as primary and a hardware-based secondary on *guest*. Oh, for secondary in guest, it may needn't above changes. You can try it without any change. I can't: ENOHARDWARE. How much useful it is - it's another question. For instance, I've no idea how windows guest will be able to use such secondary vga card on guest. I don't know. Is there any interesting usage of this secondary VGA in guest? I *guess* windows can be told to use non-primary display. But I've no idea how. Also, it certainly supports multi-display configuration somehow. Running most stuff on secondary should be possible. /mjt -- 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
