virtualization | 易学教程

How is it that main function is always loaded at the same address whereas variables have different address most of the time?

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问题 I wrote this small program today and I was blown away by the results. Here is the program int main(int argc, char **argv) { int a; printf("\n\tMain is located at: %p and the variable a is located at address: %p",main,&a); return 0; } on my machine the main function is always loaded at address "0x80483d4" and the address of the variable keeps on varying How does this happen? I read in operating systems that as a part of virtualization scheme the OS keeps relocating the address of instructions.

Is user mode linux (UML) project stopped?

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问题 For some educational project I need to work with user-mode-linux (UML). Based on the homepage of UML, it seems that the project was stopped at 2004. However, the author of project was hired by Intel in 2004 to work on UML full-time. Is the project dead or continued by Intel (or open source community) with new name? 回答1: While it does look stale, it still works as of v4.9.6. Tested with this setup: https://unix.stackexchange.com/questions/73203/how-to-create-rootfs-for-user-mode-linux-on

Is it possible using C# to check if hardware virtualization enabled?

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Couldn't find an answer, so I thought I ask for myself. Using C#, how can I check if the CPU has hardware virtualization enabled? Hyper-V, for example. It's not in the Win32_Processor class, and my attempt to connect to the MSVM_ComputerSystem was met with utter failure. Keeps telling me there's an invalid namespace. Code below. ManagementObjectSearcher vm = new ManagementObjectSearcher(@"\\.\root\virtualization", "select * from MSVM_Computersystem"); ManagementObjectCollection vmCollection = vm.Get(); foreach (ManagementObject mo in vmCollection) { cpuVirtual = mo["EnabledState"].ToString();

How can i Extract Files From VDI

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问题 I was using VirtualBox on my PC( WIN 7 ) I managed to View some files in my .VDI file.. How can I open or view the contents of my .vdi file and retrieve the files from there? 回答1: You can mount partitions from .vdi images using qemu-nbd : sudo apt install qemu-utils sudo modprobe nbd vdi="/path/to/your.vdi" # <<== Edit this sudo qemu-nbd -c /dev/nbd0 "$vdi" # view partitions and select the one you want to mount. # Using parted here, but you can also use cfdisk, fdisk, etc. sudo parted /dev

Can TFS workspaces be used without being tied to a specific machine?

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问题 So I've got a situation where we have a project with 10 developers. Each developer, when they come in for the day, is randomly issued a machine to use for development that day. The machine names are different, say DEV01 - DEV10. At the time that they are issued to the developers, the machines are identical, and no changes the developers make during the day are persisted on the machines (source code changes are stored in TFS, not locally). These are of course actually virtual machines, but

Virtual parallel port emulator

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问题 In my computer networks course we are supposed to learn parallel port programming by using the native registers (like using outportb like commands). I don't have a parallel port (because I live in 2011) but want to practice the programs (I installed the old turboc 3 IDE using dosbox). Is there a program which emulates parallel ports like this program emulates serial ports? 回答1: Since the environment is fake anyway, i.e. you don't have an actual port to play with, you could just as well

How to enable VT-x/AMD-v in Aspire V5-122P bios? [closed]

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Closed. This question is off-topic . It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I have been trying to download and run Back track Linux 5 r3 on my windows 8.1 (AMD Quad-Core processor, 64bit Intel.) using Virtual Box. It kept giving me the error "This Kernel requires an x86-64 bit cpu but only detected an i686 cpu so I downgraded to 4.2 Virtual Box. That solved the problem but now I keep getting an error when I run Virtual Box linux with Ubuntu 64 bit "VT-x/AMD-v hardware acceleration is

What kind of servers did you virtualize lately?

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I wonder what type of servers for internal usage you virtualize in the last -say- 6 months. Here's what we got virtual so far: mediawiki bugtracker (mantis) subversion We didn't virtualize spezialized desktop PCs which are running a certain software product, that is only used once in a while. Do you plan to get rid of those old machines any time soon? And which server products do you use? Vmware ESX, Vmware Server, Xen installations...? My standard answer to questions like this is, "virtualization is great; be aware of its limitations". I would never rely on a purely-virtual implementation of

How to register a virtual card to alsa from user-space?

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I'm developing a virtual device from the user space (using umview http://wiki.virtualsquare.org/wiki/index.php/UMview ) so, i need to register my device to the system's sound cards list (I've never used alsa in a kernel module so I think that I need to call the snd_card_register() function) but I can't find a way to do that from the userspace... maybe I can write a syscall to do that? I think you should stop bothering about overriding any particular file (i.e. stop using umview, it's not needed) and simply use the "file" plugin to create device in the ALSA config that will pipe the data to

Sandbox Virtual Machine for an Application (concept)

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I'd like to write a sandbox virtual machine for executing a compiled program. My goal is to isolate that program from the rest of operating system and control its execution so that it can't do anything harmful to a host computer. I assume that: executed program is compiled to Portable Executable format and it's in machine code, not in any kind of byte code or for CLR, executed program is not allowed to communicate with peripherals like printer, scanner, and doesn't use any GUI, executed program's main task is to process some data stored in a local file (eg. calculations), and put its results