Multiple Projects(or images) on STM32 Board
I'm here to ask some questions about my project.Now I'm implementing a lite hypervisor.So I made three discrete projects(monitor.bin, OS1.bin, OS2.bin), and divided memory.MEMORY{ CCMRAM (xrw) : ORIGIN...
View ArticleWhat is the CSR for the S mode that is effective even in HS mode?
I'm new to RISC-V and have recently started learning about it. I'm currently developing with the help of documents available on riscv.org.While investigating Hypervisor extensions, I noticed that there...
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Enter Hypervisor Mode on ARMv7 through Kernel Module
I am working on a project where I have a router with ARMv7 processor (Cortex A15) and OpenWRT OS. I have a shell on the router and can load kernel modules with insmod.My goal is to write a kernel...
View ArticleWhat is the role of HS level sstatus.MXR in two stage paging when...
Note: The document version used for the quote below is 20211203 dated October 2, 2023.In section 9.5 of the RISCV privileged spec there is the following statement:The vsstatus field MXR, which makes...
View ArticleUnderstanding the Role and Implementation of VMID in RISC-V Hypervisor hgatp...
I'm currently working on implementing a RISC-V hypervisor and have a question regarding hgatp during guest OS switches.When HSXLEN=64, VMID is located in bits 44 to 57 of hgatp. Although I've consulted...
View ArticleHypervisor Installation Failed to update status to COMPLETE
Using Android Studio, I am trying to install Android Emulator Hypervisor. I get the following error messageFailed to update status to COMPLETEThe log file idea.log has:"Install Android Emulator...
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Hyper-V Virtual Machine Management Service (VMMS) not listed in Services
I recently installed Hyper-V on my Windows 11 home machine. All was working fine until one day I was deleting, from the Hyper-V Manager, what I thought were my created virtual machines but I think I...
View ArticleConvert qcow2 to vmdk and make it ESXi 6.0 Compatible
I am currently working on VMWare virtualization; I am trying to make a converted image from qcow2 to vmdk work with ESXi Server 6.0. I have myImage.qcow2 with a disk which is thin provisioned for...
View ArticleWhy does the VMCS ES selector have a index of 0 instead of 3?
I found that the ES selector field is 0x0800 but shouldn’t it be 0x0806 since it’s the 3rd index in the list CS, SS, DS, ES, FS, GS, LDTR, TRI got the selector list from Volume 3C: System Programming...
View ArticleHow to instantiate an ARM-based VM through Linux KVM API on x86?
Say I have a x86 machine. It's easy to create a x86 VM through Linux KVM API.See: vm_init() in kvm-host:if ((v->kvm_fd = open("/dev/kvm", O_RDWR)) < 0) return throw_err("Failed to open...
View ArticleCan the hypervisor and AMD SEV VMs share memory?
I was wondering if modifying the KVM would allow the hypervisor and VM to share memory.I've been studying SEV, AMD's memory encryption technology, and this question came up.Is it possible for the...
View Article2D page walk using EPT
EPT extension defines a base register that points to level 4 page table of the hypervisor (host physical address).When a TLB miss occurs, the page table walker takes 20 memory accesses to translate a...
View ArticleHow does a bare metal hypervisor and the operating system it hosts coordinate...
I have read a great deal about bare metal hypervisors, but never quite get the way they interact with an OS they are hosting.Suppose you have Unix itself on bare metal. When in user mode, you can't...
View ArticleCMD gives error Feature Name Microsoft-Hyper-V Is Unknown
I tried to disable Hyper-V in the Command Prompt and it gave this error :Feature Name Microsoft-Hyper-V Is UnknownThe Hyper-V has not been disabled.
View ArticleQEMU/virt64 vGIC dist and CPU interface addresses
I'm working with QEMU/virt64 (armv8) and I've a question related to an IRQ injection from my hypervisor running in EL2 mode.First, is it correct that the vGIC distributor address is 0x08000000, i.e....
View ArticleIntel VT-x: How do I trigger posted interrupt processing on the same core?
I'm struggling to fully understand the posted interrupt processing feature in Intel VT-x. Ignoring VT-d for the moment, as a first baby step I am just trying to get CPU based posted interrupt delivery...
View ArticleAndroid Studio Emulator is not working on Windows 11 using WHPX
I have Windows 11 on my system.The system specifiction:Edition: Windows 11 Home Single LanguageUpdate: 21H2Installed on: ‎06-‎07-‎2021OS build: 22000.65Experience: Windows Feature Experience Pack...
View ArticleRunning powershell for VM checkpoint restore via double clicking a batch file...
Afternoon. I'm new new to this and trying to expand my knowledge so forgive me if I sound way off from left field.I have a PC running a VM that I use to teach students some of our software install in...
View ArticleTrying to make 10 VMs in Windows Hypervisor getting "Import-VM : The file...
I am trying to make 19 copies of a VM (will be used for testing)PowerShell is outside of my area of expertise but put this together with a modest about of research and ChatGPT. Unfortuatley I have not...
View ArticleWhy don't I get the correct function RVA from the PE export table in my...
I'm writing a minimal PE loader that parses the export table to locate functions by name, in my hypervisor. However, when I try to retrieve the RVA of a function, the value seems incorrect. Here's the...
View Articlelibvirt: understand the domain by newbie
Libvirt gives the definition of domain, i.e. it is an instance of OS running in VM. But then virsh domcapabilities reports the capabilities of this OS as well as underlying hypervisor, so domain...
View ArticleXEN compilation binary for x86_64 platform always result ELF 32-bit LSB...
For experiment, I simulate x86_64 architecture using qemu-system-x86_64 on top of x86_64 based host machine (Ubuntu 22.04). Next I want to boot with Xen binary.However when I compile Xen hypervisor...
View Articledisabling HW-prefetcher on an android Pixel 8
I am writing a kernel module which makes some low level experiments, and I've noticed that the HW prefetcher is intrupting them. I want to disable it while the experiemnts run.I am running on Pixel 8...
View ArticleHow to know the interrupt ID which is signaled currently without...
I'm working on a hypervisor on ARMv8 (GICv3), which runs one host VM and one guest VM.Host VM does not support a virtual GIC, but guest VMs have vGIC support.To support this hybrid model where vGIC is...
View ArticleHow to debug QEMU live migration with GDB without causing the destination VM...
I'm trying to debug the QEMU source code to track dirty page updates during live migration. My goal is to inspect the behavior inside functions like cpu_physical_memory_set_dirty_lebitmap() on the...
View ArticleEL1 to EL0 exception hangs in qemu while simulating svc trap
I have below assembly code and I am trying to trap svc exception, however the code just hangs.global _start.section .text_start: // --- Setup EL1 stack --- ldr x0, =_el1_stack_top mov sp, x0 // ---...
View ArticleHow to run Android 13+ (aosp-arm64) on QEMU without Cuttlefish?
I have been trying to run a self-compiled AOSP build in QEMU. I have successfully compiled the AOSP source code for android-13.0.0_r84 (target aosp_arm64-eng) and obtained the following image...
View ArticleVisual Studio 2022 (MAUI/Xamarin) Android Device Manager does not support AEHD
On my brand new Win11 Pro machine (AMD Ryzen 9 7950X) my Visual Studio 2022 Enterprise installation (v17.7.6) doesn't use hardware acceleration when I disable Hyper-V and enable AEHD (or GVM).Short...
View ArticleAndroid Emulator on AMD/Win 10
I've read ton of links with the procedure to use hardware acceleration for Android emulator on Ryzen processor/Win 10. I've enabled Windows Hypervisor Platform and SVM on Bios (I'm on Ryzen 7...
View ArticleWhat is the proper way to check if HyperV is running?
I am trying to write a powershell script to install and set up Hyper-V machines. The install seems to be ok, however, I get contradictory responses from the system.Basically, I use the (gcim...
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