vsock | Package vsock provides access to Linux VM sockets | Infrastructure Automation library
kandi X-RAY | vsock Summary
kandi X-RAY | vsock Summary
Package vsock provides access to Linux VM sockets (AF_VSOCK) for communication between a hypervisor and its virtual machines. MIT Licensed. For more information about VM sockets, check out my blog about Linux VM sockets in Go.
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QUESTION
I'm working on a codebase which binds to a Tokio socket and manages a TCP connection. In production, it binds to an AF_VSOCK using the tokio-vsock crate.
While developing locally on Mac, the AF_VSOCK API isn't available as there is no hypervisor -> VM connection — it's just being run natively using cargo run.
When running locally, I have been creating a standard tokio::net::TcpListener struct and in production I have been creating a tokio_vsock::VsockListener. Both structs are mostly interchangeable and expose the same methods. The rest of the code works perfectly, regardless of which struct is being used.
So far, I have just kept both structs and simply commented out the one that isn't needed locally — this is clearly not "good practice". My code is below:
...ANSWER
Answered 2021-Jan-08 at 12:50There multiple options. The easiest and a very common one in regards to usage in the stdlib itself is using a #[cfg] macro (instead of cfg!(). The following code snippet clarifies it's usage:
QUESTION
I have a rooted device connected to my Ubuntu 16 machine. I have enabled its DM port from device with secret code #0808#
On Windows, I can see a COM port in device manager but on linux I am unable to find the correct port.
I have tried to check the new /dev/android4 that appears when enabling the DM port but it doesn't seems to be correct port when trying to open it. I am getting following error on it:
Error from tcgetattr: Inappropriate ioctl for device
This is my code to open this port:
...ANSWER
Answered 2020-Aug-18 at 16:13in general, regarding;
QUESTION
I am testing VMX in Linux (Ubuntu-16.04) in a VMware platform.
When the VM is running a long loop, the host Linux hit CPU softlock, as follows,
...ANSWER
Answered 2018-Jun-14 at 08:14The easiest way to avoid this is to call schedule() in the handling loop of vmexit in kernel space.
QUESTION
I cannot seem to figure this one out, but the issue is when I try to serve a vsock connection on a given port, it keeps returning resource temporarily unavailable. Even though it says temporarily, it loops forever. Does anyone have an inkling to what is going on?
...ANSWER
Answered 2019-Dec-26 at 07:15Turns out this was an issue with usage of an earlier kernel which used different mode and dev when using mknod. In earlier Linux kernel version, they would allocate a random dev value. However, later kernels will mknod with 10, 241.
QUESTION
I am attempting to expose the SPI #2 interface from the Intel E3900 series (specifically the E3940) as a spidev interface to CentOS8 (kernel version 4.18). As a fallback, any method to access the SPI controller through a C/C++ API would be acceptable.
I am trying to determine if the issue is something that must be corrected by the BIOS vendor or something I can fix with an ACPI patch. The vendor (Congatec) has claimed that the SPI interface is currently not supported as a userspace entity, but I am still waiting for my issue to be escalated to their engineering group to confirm that. The vendor also stated that the BIOS setting for the SPIs should be left at "Disabled", but I have also tried the "PCI" and "ACPI" options with no change.
I have attempted to merge together snippets from several references to create an ACPI patch, including:
spidev Linux driver on Intel Atom board
https://www.kernel.org/doc/Documentation/acpi/initrd_table_override.txt
https://www.kernel.org/doc/html/latest/firmware-guide/acpi/enumeration.html
I have recompiled the CentOS8 kernel to include all the necessary options, and I am able to successfully rebuild the Linux initrd (initramfs in CentOS8). I confirmed through dmesg logs that my modification is being loaded at boot; I don't see any error messages in the logs, so I am assuming that it is being applied successfully.
For reference, here are the kernel options I have ensured are compiled in (=y). I plan to eventually use kernel modules in concert with the stock kernel, but for now I thought this was the easier path.
...ANSWER
Answered 2019-Dec-11 at 18:12Thankyou to 0andriy! He got me past the roadblock and taught me a few new commands along the way. The root cause of my issue was two-fold as it turned out:
1) The board vendor had cautioned me against enabling SPI#1 in BIOS, as that bus is used to control items on the SOM itself (assuming via their Linux BSP/driver?). I had to enable all three SPI interfaces in ACPI mode to have them be loaded and show up in the lspci -nk -s 19 output.
2) The device-tree update file had an error, which I missed previously because the interface itself was not being loaded. The AML file needed to specify Chip-Select 1, not 2.
The script below will make all of the initrd changes and expose all three SPI buses using SPIDEV. On the board I am testing with, the eSPI bus is coming through as spidev1.
I still need to confirm the maximum speed the e3900 can handle, but I think the other parameters are set correctly.
QUESTION
I'm attempting to use a system call to add two numbers together and assign the result to a memory location via pointer. I've set up the system call and wrote a test for it, but the system call is failing when I try to assign the result by dereferencing the passed pointer. Is there something I'm missing with system calls and pointers?
The system call
...ANSWER
Answered 2018-Sep-12 at 21:44You should use copy_to_user to safely copy data to userspace.
Userspace pointer should not be dereferenced directly by the kernel code - pointer can be invalid, memory at that location might be unavailable (might be swapped out).
QUESTION
I copy the fs/ext2/ as fs/myext2/, and have modified all the things I need to modify, and it all does well before I change the fs/myext2/file.c. And it does well, when I change like this (
Add following codes into file.c, and the new_sync_write and new_sync_read functions are copied from fs/read_write.c.
And I also add another header linux/uio.h,
add .read = new_sync_read_crypt, .write = new_sync_write_crypt to const struct file_operations myext2_file_operations).
ANSWER
Answered 2018-Jan-01 at 12:38I'll attempt an answer.
1. read part:
You're relying on the passed length, not the returned length ret here:
QUESTION
I made a plugin for Nagios/Icinga that parses networking device logs for strings but it's causing kernel panics in large environments. The full code can be found here. I've tried reinstalling the kernel and some packages but it still persists. It's also running on another server just fine, but that server monitors less hosts. How can I troubleshoot the Oops to fix the code or repair the server?
The script uses Net::OpenSSH to connect to different networking devices and run "sh log", an example excerpt is:
...ANSWER
Answered 2017-Oct-11 at 06:51The bug report in the log says the issue is on tty_ioctl, so it is triggered when ioctl is called on a tty file descriptor. Net::OpenSSH uses a pseudo-tty when doing password authentication, so, a possible workaround for your problem would be to switch to a different authentication mechanism not requiring a tty as for instance public key authentication.
Also, the backtrace shows that the crash happens when manipulating the file system, so maybe your real problem is a corrupted file system triggering some kernel bug. You could try to force a fsck on the machine file systems or just to recreate them.
You didn't say which Linux distribution you are using neither the kernel version. You could try switching to a different one.
In any case, it is the first time anybody reports this problem, and Net::OpenSSH is used frequently with password authentication, so, unless you are using a pretty rare kernel version, there should be something special in your system that causes this bug to show up.
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