![]() The control ends up at qemu_reboot, which should reset HaveRunPost to 0 and trigger another reset, so that this second time around, the BIOS sees HaveRunPost as 0, and follows the initialization path instead.īut, even though the instruction to update HaveRunPost seems to run, the value remains non-zero (2 to be exact). This should be the same virtual disk you defined with the qemu-img command. ![]() The virtual disk Use -hda imagefile to tell QEMU to use imagefile as the hard drive image. After installing the necessary tools like libvirt and kvm it seems qemu is missing its main executable, the QEMU PC System emulator, /usr/bin/qemu-system-x8664: On a CentOS 7 machine (on which I have done this a dozen times) I ran. When performing system emulation, QEMU represents a complete computer. To emulate a more modern system, use qemu-system-x8664. Learn x86, ARM, and RISC-V architectures and the design of smartphones, PCs. QEMU is a generic and open source processor emulator which achieves a good emulation speed by using dynamic translation. If your hardware supports it, also install kmod-kvm-amd or kmod-kvm-intel for better performance. The command to start QEMU To emulate a legacy PC system, use qemu-system-i386. Attempting to continue with the default i8086 settings. QEMU is packaged by most Linux distributions: Arch: pacman -S qemu. When the reset is clicked, the BIOS does indeed gain control and follow the resume path because HaveRunPost is 2. Depending on the guest architecture, install qemu-x8664-softmmu or qemu-arm-softmmu. Expected results (from QEMU version 2.8.1): terminal 1 qemu-system-x8664 -S -s terminal 2 (gdb) set architecture i8086 warning: A handler for the OS ABI 'GNU/Linux' is not built into this configuration of GDB. If HaveRunPost is non-zero, the BIOS follows the resume path. Video demonstration using QEMU to emulate and virtualize an x8664 system, booting from both BIOS and UEFI modes. The reboot loop occurs because a variable defined by Seabios cannot be updated, possibly because the memory is read-only. Attribution-ShareAlike 4.0 International. See that the VM locks up, instead of resetting.Qemu-system-x86_64 -M q35 -enable-kvm Steps to reproduce There might be other reboot mechanisms that result in the same loop. Is rebooted through UI->Machine->Reboot menu, or through outb(0xcf9, 0xf). When using tcg, the virtual machine goes into a reboot loop after the VM
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