Re: [Qemu-discuss] Run qemu with /dev/sda ?

[Ran Shalit]

On Mon, Apr 18, 2016 at 10:36 PM, Peter Maydell
<address@hidden> wrote:
> On 18 April 2016 at 20:17, Ran Shalit <address@hidden> wrote:
>> I probably have some misunderstanding with running qemu.
>> I see in the following link:
>> http://www.osadl.org/Use-BuildRoot-to-create-a-Linux-image-fo.buildroot-qemu.0.html
>> that qemu should be run as following:
>>
>> KERNEL="bzImage"
>> DISK="rootfs.i686.ext2"
>>
>> qemu-system-i386 -kernel $LOCATION/$KERNEL \
>> -hda $LOCATION/$DISK \
>> -boot c \
>> -m 128 \
>> -append "root=/dev/sda rw" \
>> -localtime \
>> -no-reboot \
>> -name rtlinux \
>> -net nic -net user \
>> -redir tcp:2222::22 \
>> -redir tcp:3333::3333
>>
>> But how can it be that qemu use the same disk as the host ?
>> Isn't it dangerous ?
>
> QEMU isn't using the same disk as the host: this command line
> says "your first hard disk should be emulated using the
> rootfs.i686.ext2 image file". So the guest won't be making
> raw accesses to the same hard disk the host is using.
>

So I should expect the file rootfs.i686.ext2 to be modified every time
after doing something in guest OS, Right ?
I mean that writing to root filesystem will result in slightly
different in rootfs.i686.ext2 after quiting qemu.

Thanks,
Ran