Using Virtio-gpio in guest VM
-----Original Message-----It'd be great to see someone tackle this. I've captured it on this wiki page too: https://github.com/projectacrn/acrn-hypervisor/wiki/ACRN-Future-Development---Ideas-&-Concepts
From: acrn-users@... <acrn-users@...>
On Behalf Of Yu Wang
Sent: Wednesday, July 6, 2022 4:13 pm
To: acrn-users@...
Subject: Re: [acrn-users] Using Virtio-gpio in guest VM
Hi,
On Thu, May 12, 2022 at 11:05:21PM -0700, shibi590268@... wrote:Fuzhong,latest acrn hypervisor tag release_2.7. Hence i patched the code to the latest
I checked the acrn kernel with tag release_1.4. That seems to work with
kernel 5.10/preempt-rt and it worked. Consider this as my suggestion it
would be good if the virtio-gpio patch is carried over to the latest kernels in
the future.
The virito-gpio has been upstreamed in virtio 1.2 spec and its FE driver also
integrated to Linux kernel.
The ACRN1.4's Virtio gpio implementation is far away from the upstream
version. So the correct way is to implement a new virtio-gpio BE followed the
spec...
It is not on our roadmap, but we expect anyone from ACRN community can
contribute it. :)
Geoffroy
Thanks
Yu
On Thu, May 12, 2022 at 11:05:21PM -0700, shibi590268@... wrote:
Fuzhong,The virito-gpio has been upstreamed in virtio 1.2 spec and its FE driver
I checked the acrn kernel with tag release_1.4. That seems to work with latest acrn hypervisor tag release_2.7. Hence i patched the code to the latest kernel 5.10/preempt-rt and it worked. Consider this as my suggestion it would be good if the virtio-gpio patch is carried over to the latest kernels in the future.
also integrated to Linux kernel.
The ACRN1.4's Virtio gpio implementation is far away from the upstream
version. So the correct way is to implement a new virtio-gpio BE
followed the spec...
It is not on our roadmap, but we expect anyone from ACRN community can
contribute it. :)
Thanks
Yu
I checked the acrn kernel with tag release_1.4. That seems to work with latest acrn hypervisor tag release_2.7. Hence i patched the code to the latest kernel 5.10/preempt-rt and it worked. Consider this as my suggestion it would be good if the virtio-gpio patch is carried over to the latest kernels in the future.
I could find the same macros present in the master branch.
Please let me understand what is the difference between them as far as virtio gpio is concerned.
Is there any possibility that virtio gpio be supported in future releases?
Hi
Checked with ACRN expert, following ACRN virtio devices work well with V1.4; but not maintained any more.
devicemodel/include/virtio.h
* ACRN virtio device IDs
*/
#define VIRTIO_DEV_RPMB 0x8601
#define VIRTIO_DEV_HECI 0x8602
#define VIRTIO_DEV_AUDIO 0x8603
#define VIRTIO_DEV_IPU 0x8604
#define VIRTIO_DEV_TSN 0x8605
#define VIRTIO_DEV_HYPERDMABUF 0x8606
#define VIRTIO_DEV_HDCP 0x8607
#define VIRTIO_DEV_COREU 0x8608
#define VIRTIO_DEV_GPIO 0x8609
#define VIRTIO_DEV_I2C 0x860a
https://github.com/projectacrn/acrn-hypervisor/tree/release_1.4/
https://github.com/projectacrn/acrn-kernel/tree/release_1.4
BR.
Fuzhong
Sent: Monday, May 9, 2022 6:06 PM
To: acrn-users@...
Subject: Re: [acrn-users] Using Virtio-gpio in guest VM
On Mon, May 9, 2022 at 02:43 PM, Liu, Fuzhong wrote:
lspci -xxxxvvvv
attached lspci info
Please share lspci -xxxxvvvv
BR.
Fuzhong
Sent: Monday, May 9, 2022 4:43 PM
To: acrn-users@...
Subject: Re: [acrn-users] Using Virtio-gpio in guest VM
Please find the attachments. config, dmesg and lspci.
Hi
Please share the kernel config and dmesg log of User VM which included the driver.
Thanks!
BR.
Fuzhong
Sent: Saturday, May 7, 2022 9:57 AM
To: acrn-users@...
Subject: Re: [acrn-users] Using Virtio-gpio in guest VM
Hi Geoffroy,
I checked in the latest version of kernels(i.e., 5.18) which included the driver in question. I compiled the kernel with CONFIG_GPIO_VIRTIO=y. I see the same behavior as before. The virtio-gpio gets emulated as a PCI device.
Should there be some examples or some references that was used while evaluating the virtio gpio, please share that. Thanks in Advance
I checked in the latest version of kernels(i.e., 5.18) which included the driver in question. I compiled the kernel with CONFIG_GPIO_VIRTIO=y. I see the same behavior as before. The virtio-gpio gets emulated as a PCI device.
Should there be some examples or some references that was used while evaluating the virtio gpio, please share that. Thanks in Advance
Yes, that’s the driver in question. I do not know if we have a version of it for the latest kernel, let’s see what the kernel team has to say about it.
Geoffroy
Sent: Monday, May 2, 2022 1:09 pm
To: acrn-users@...
Subject: Re: [acrn-users] Using Virtio-gpio in guest VM
Hi
I want to use little latest kernel. Do you mean this driver gpio-virtio.c.
Is following the config that you are pointing to?
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config GPIO_VIRTIO
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tristate "GPIO virtio-based front-end driver"
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depends on X86 && PCI && VIRTIO_PCI
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help
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This module implements GPIO emulation over virtio transport.
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Say Y or M here to build GPIO virtio front-end driver.
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If the driver is built as a module, it will be called gpio-virtio.
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I want to use little latest kernel. Do you mean this driver gpio-virtio.c. Is following the config that you are pointing to?
| config GPIO_VIRTIO | |
| tristate "GPIO virtio-based front-end driver" | |
| depends on X86 && PCI && VIRTIO_PCI | |
| help | |
| This module implements GPIO emulation over virtio transport. | |
| Say Y or M here to build GPIO virtio front-end driver. | |
| If the driver is built as a module, it will be called gpio-virtio. |
I don’t see this anywhere in the 5.10 version, while it was there in the 4.19/preempt-rt. I suspect that means it’s a driver that was never upstreamed (or is still in the process of being upstreamed).
Is using the 4.19 kernel an option for you?
Does anyone from the kernel team know if there is a version of that driver for the 5.10 preempt-rt kernel?
Thanks,
Geoffroy
Sent: Monday, May 2, 2022 9:44 am
To: acrn-users@...
Subject: Re: [acrn-users] Using Virtio-gpio in guest VM
Hi
I am using the ACRN patched rt kernel from
https://github.com/projectacrn/acrn-kernel.git with 5.10/prempt-rt branch to use it in RTVM. I am unable to locate CONFIG_VIRTIO_GPIO=Y in the config. Is there any separate patch available for this?
Attached is the .config file
I am using the ACRN patched rt kernel from https://github.com/projectacrn/acrn-kernel.git with 5.10/prempt-rt branch to use it in RTVM. I am unable to locate CONFIG_VIRTIO_GPIO=Y in the config. Is there any separate patch available for this?
Attached is the .config file
Hi
Is following kernel config enabled in your User VM?
CONFIG_VIRTIO_GPIO=y
Please share the kernel config and dmesg log of User VM.
Thanks!
BR.
Fuzhong
Sent: Friday, April 29, 2022 9:30 PM
To: acrn-users@...
Subject: [acrn-users] Using Virtio-gpio in guest VM
Hello,
I need to use two gpio pins from a VM.
I used -s 10,virtio-gpio,@gpiochip0{11=pin0:12=pin1} \ in the launch scripts. The kernel boots up successfully with a new pci device added 00:0a.0
PIC: Intel Corporation Device 8609.
The device is getting listed as PIC: Intel Corporation Device 8609. is this correct?
But i couldn't find the gpio device listed under /dev/
ls /dev/gpio
ls: cannot access '/dev/gpio': No such file or directory
or in /sys/class/gpio
ls /sys/class/gpio/
export unexport
ls /sys/bus/gpio/devices/
ubunturt@ubunturt-Standard-PC-i440FX-PIIX-1996:~$
I couldn't find virtio-gpio module in kernel. So I used a patch from https://lkml.iu.edu/hypermail/linux/kernel/2108.1/01975.html. But still i am not successful in this.
Is there anything that i am missing? Is there any patch recommendation available that could be used.
User VM: ubuntu
Service VM : ubuntu
I am using ACRN hypervisor: v2.8
I need to use two gpio pins from a VM.
I used -s 10,virtio-gpio,@gpiochip0{11=pin0:12=pin1} \ in the launch scripts. The kernel boots up successfully with a new pci device added 00:0a.0 PIC: Intel Corporation Device 8609.
The device is getting listed as PIC: Intel Corporation Device 8609. is this correct?
or in /sys/class/gpio
I couldn't find virtio-gpio module in kernel. So I used a patch from https://lkml.iu.edu/hypermail/linux/kernel/2108.1/01975.html. But still i am not successful in this.
Is there anything that i am missing? Is there any patch recommendation available that could be used.
User VM: ubuntu
Service VM : ubuntu
I am using ACRN hypervisor: v2.8