ACRN Shell Commands

The ACRN hypervisor shell supports the following commands:

Command (and parameters)	Description
help	Display information about supported hypervisor shell commands
version	Display the HV version information
vm_list	List all VMs, displaying the VM UUID, ID, name, and state (“Started”=running)
vcpu_list	List all vCPUs in all VMs
vcpu_dumpreg <vm_id> <vcpu_id>	Dump registers for a specific vCPU
dump_host_mem <hva> <length>	Dump the host memory region as specified by the start of the region hva (in hexadecimal) and its length length (in bytes, decimal number).
dump_guest_mem <vm_id> <gva> <length>	Dump a User VM (guest) memory region based on the VM ID (vm_id, in decimal), the start of the memory region gva (in hexadecimal) and its length length (in bytes, decimal number).
vm_console <vm_id>	Switch to the VM’s console. Use Ctrl+Spacebar to return to the ACRN shell console
int	List interrupt information per CPU
pt	Show pass-through device information
vioapic <vm_id>	Show virtual IOAPIC (vIOAPIC) information for a specific VM
dump_ioapic	Show native IOAPIC information
loglevel <console_loglevel> <mem_loglevel> <npk_loglevel>	If no parameters are given, the command will return the level of logging for the console, memory and npk Give (up to) three parameters between 0 (none) and 6 (verbose) to set the loglevel for the console, memory, and npk (in that order). If less than three parameters are given, the loglevels for the remaining areas will not be changed
cpuid <leaf> [subleaf]	Display the CPUID leaf [subleaf], in hexadecimal
rdmsr [-p<pcpu_id>] <msr_index>	Read the Model-Specific Register (MSR) at index msr_index (in hexadecimal) for CPU ID pcpu_id
wrmsr [-p<pcpu_id>] <msr_index> <value>	Write value (in hexadecimal) to the Model-Specific Register (MSR) at index msr_index (in hexadecimal) for CPU ID pcpu_id

Command examples

The following sections provide further details and examples for some of these commands.

vm_list

vm_list provides the name of each virtual machine and its corresponding ID and state.

Figure 33 vm_list information

vcpu_list

vcpu_list provides information about virtual CPUs (vCPU), including the VM ID, PCPU ID, VCPU ID, VCPU ROLE (primary or secondary), and VCPU STATE (init, paused, running, zombie or unknown).

Figure 34 vcpu_list information

vcpu_dumpreg

vcpu_dumpreg vmid cpuid provides vCPU related information such as registers values, etc.

In the following example, we dump vCPU0 RIP register value and get into the Service VM to search for the currently running function, using these commands:

cat /proc/kallsyms | grep RIP_value

As you can see, vCPU0 is running in function acpi_idle_do_entry.

Figure 35 vcpu_dumpreg information

Figure 36 system map information

dump_host_mem

dump_host_mem hva length provides the specified memory target data such as the physical CPU (pCPU) number, etc.

In this example, we know the pCPU active bitmap and physical CPU number physical memory address through build/hypervisor/acrn.map. (Note that the path for acrn.map depends on how we build the hypervisor.)

Then we can dump the memory address of the pCPU active bitmap and CPU number, we will know that pCPU active bitmap is 0x000000000000000f and pCPU number is 0x0000000000000004.

Figure 37 dumpmem information

Figure 38 acrn map information

dump_guest_mem

The dump_guest_mem command can dump guest memory according to the given VM ID and guest virtual address (gva).

In this example, we know the starting address of kernel text segment in guest console or through the system.map (Note that the path for system.map depends on how we build the kernel)

Figure 39 guest virtual address

Figure 40 guest memory information

vm_console

The vm_console command switches the ACRN’s console to become the VM’s console. Use a Ctrl-Spacebar to return to the ACRN shell console.

vioapic

vioapic <vm_id> shows the virtual IOAPIC information for a specific VM. In the following figure, we show the virtual IOPIC information for VM1:

Figure 41 vioapic information

dump_ioapic

dump_ioapic provides IOAPIC information and we can get IRQ number, IRQ vector number, etc.

Figure 42 dump_ioapic information

pt

pt provides pass-through detailed information, such as the virtual machine number, interrupt type, interrupt request, interrupt vector, trigger mode, etc.

Figure 43 pt information

int

int provides interrupt information on all CPUs and their corresponding interrupt vector.

Figure 44 int information

cpuid

cpuid <leaf> [subleaf] provides the CPUID leaf [subleaf] in hexadecimal.

Figure 45 cpuid information

rdmsr

We can read model specific register (MSR) to get register values through rdmsr [-p<pcpu_id>] <msr_index>.

In the following example, we can get IA32_APIC_BASE value of pCPU 0 through the command:

rdmsr -p0 1b

and see that 1B (Hexadecimal) is the IA32_APIC_BASE MSR address.

Figure 46 IA32_APIC_BASE register information

Figure 47 rdmsr information

wrmsr

We can write model specific register (MSR) to set register values through wrmsr [-p<pcpu_id>] <msr_index> <value>.

In the following example, we can set IA32_APIC_BASE value of pCPU 1 through the command:

wrmsr -p1 1b 0xfee00c00