[Qemu-devel] Get virtual memory value

[Qemu-devel] Get virtual memory value

[Alexander Basov]

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Hello.
I'm new in qemu internals, and I'd like to know, how can I get
a value, which is stored in virtual memory address, allocated by guest OS.

Thanks.

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Re: [Qemu-devel] Get virtual memory value

[Richard W.M. Jones]

On Tue, Apr 28, 2009 at 10:26:52AM +0400, Alexander Basov wrote:
> Hello.
> I'm new in qemu internals, and I'd like to know, how can I get
> a value, which is stored in virtual memory address, allocated by guest OS.

It's possible using the 'memsave' command in the console.

We expose this through libvirt:

http://libvirt.org/html/libvirt-libvirt.html#virDomainMemoryPeek

Rich.

-- 
Richard Jones, Emerging Technologies, Red Hat  http://et.redhat.com/~rjones
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://et.redhat.com/~rjones/virt-df/

Re: [Qemu-devel] Get virtual memory value

[Alexander]

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28.04.2009 16:39, Richard W.M. Jones ?????:
> On Tue, Apr 28, 2009 at 10:26:52AM +0400, Alexander Basov wrote:
>    
>> Hello.
>> I'm new in qemu internals, and I'd like to know, how can I get
>> a value, which is stored in virtual memory address, allocated by guest OS.
>>      
>
> It's possible using the 'memsave' command in the console.
>
> We expose this through libvirt:
>
> http://libvirt.org/html/libvirt-libvirt.html#virDomainMemoryPeek
>
> Rich.
>
>    
It is not exactly what i need.
I have some virtual memory address inside qemu.
I need to get value, which is stored in this address.

I'm trying to do as follow
1. Get phys address of given virtual address into tmp_addr
     get_phys_addr (env, address, access_type, is_user, &tmp_addr, 
&tmp_prot);

2. read value of which is stored in physical address (tmp_addr)
   cpu_physical_memory_read (tmp_addr, &result, 1);

Is it correct way?

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