qemu | The GNU MCU Eclipse QEMU

I'm developing a microkernel for my personal research. I have chosen to run my kernel at 0xf0000000, leaving 3.75 GiB for user space programs. When my kernel starts up, it sets up 32-bit paging (with hardcoded page directory and page tables). Then it checks if PAE is supported on host machine and sets up page directory pointer table (PDPT). But the problem comes when I try to load it into %cr3. According to the Intel Software Developer Manual:

Software can transition between 32-bit paging and PAE paging by changing the value of CR4.PAE with MOV to CR4.

So tried to use the following code to switch to PAE paging:

The app has:

• ListView listing player names from a DB table (only one column, so it is primary key)
• EditText to write the new name
• Button to update the name of player in the list

*there are more things, but i don´t want to make it more messy

I can click a name from the list and write a new name in the EditText. When you press the button that name is updated in the list.

Everything works correctly, but there is a problem. When I write a name that it is already in the list the app fails because primary keys cannot be repeated.

Is there some way to say "if EditText text already exists in the DB... then show a toast"

I already tried "if result of db.update is -1...then show a toast", but it doesn´t work.

This is the method in MainActivity:

I have a code below. It is part of a dynamic shared library which is loaded by qemu program (a C program) using dlopen.

I recently changed my computer and took the opportunity to move from Mageia to Fedora. But I can't do any Android development anymore because, as stated in the title, starting any AVD makes the whole system to freeze (screen, mouse and keybord) if the AVD can't connect to adb daemon. The only thing I can do is hard shutdown.

The problem here is adb daemon is always started when I try to launch an AVD as the service is enabled by default, so that shouldn't happen.

What I've been able to collect so far is a few logs in a file by lauching the emulator from command-line. All it says before freezing is:

emulator: INFO: GrpcServices.cpp:301: Started GRPC server at 127.0.0.1:8554, security: Local
emulator: ERROR: AdbHostServer.cpp:102: Unable to connect to adb daemon on port: 5037

But, if I manually restart the adb service just before lauching the AVD, I don't experience the freeze. Instead, I get the following errors before the AVD crashes:

cannot add library .../android-sdk-linux/emulator/qemu/linux-x86_64/lib64/vulkan/libvulkan.so: failed
added library .../android-sdk-linux/emulator/lib64/vulkan/libvulkan.so
cannot add library .../android-sdk-linux/emulator/lib64/vulkan/libvulkan.so.1: full

My best guess here is there's something bad going on with the graphic card. Something I am seemingly the only one to exprerience as I couldn't find any relevant result on internet. I must mention here that I've already tried to run several AVDs in multiple API versions, both software and hardware rendered graphics and I always get the same result.

My system configuration is

• AMD Ryzen 9
• Nvidia GeForce RTX 2070 using the Nouveau drivers
• kernel 5.11.

I'm trying to set up QEMU/KVM and faced the following issue:

I need a simple ODBC test scenario on WIN which I can configure very simply and be assured it is working in support of another question at Unix.SE.

In a nutshell I'm trying to setup a PyODBC/Python script connection from Debian 10 (192.168.1.2) to Windows 10 in KVM/QEMU virtual system (192.168.1.12).

First, on the Windows 10/KVM, I see the ODBC Data Source Administrator has a tab File DSN and Microsoft Text Driver. Can I use FileDSN to test Python PyODBC connection to ODBC using a simple CSV file in place of Server?? (My research with ODBC only finds running server instances).

Next, what I tried:

• On Debian I installed ODBC Microsoft driver for Linux.

• Shutdown the Windows 10 firewall, and I can ping in both directions:

  $nmap -p 22 192.168.1.12 # Deb to Win

  > Test-NetConnection 192.168.1.2 -p 22 # Win to Deb

• On Windows 10/KVM I added a FileDSN with Microsoft Text Driver. I created a CSV file (odbc_test_01.csv) with simple header and one row of data (IE. {'ID' : 1, 'NAME' : 'FOO'})

• Created a Jupyter Notebook to make testing easier. Here is my connection string and the results:

  ...

I want automatize these commands:

i'm trying to test XDP program but the test environment was provided by the client consists of one server and qemu guest running on it and act as a traffic generator ( using scapy or DPDK ). and to have this test run successfully,the packets from the guest should arrive/be injected to the NIC driver ( XDP working in native mode ) of the host. is there's any configs/hacks that can make the traffic goes from the guest to the host driver?

edit : some points to be cleared as @vipin suggested,

• on the host, the NIC is connected to virbr0 on kernel.
• the XDP is running on the physical NIC.
• i'm using bpf_redirect_map for redirecting as we still in simple stage.

anyway, i got a work around is just to add a physical router to the lab setup and it's enough for this stage of test.

I think there may be no way of avoiding this but to change function/macro name, but I ask here just in case.

I have met a strange situation.

I'm trying (just started) to modify a program A (targeted for a dynamic library) so that the program uses a function in program B (this is not relevant for this question, but Program A is a simulator for an accelerator based on multi2sim written by my colleague, and program B is qemu, the famous CPU/machine emulator).

A file driverA.cc in program A looks like this: