Re: [Qemu-devel] [PATCH V20 8/8] Add fd parameter for TPM passthrough driver

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

On 01/18/2013 07:14 PM, Stefan Berger wrote:
> On 01/18/2013 01:18 PM, Eric Blake wrote:
>> On 01/18/2013 09:02 AM, Stefan Berger wrote:
> When libvirt forks, the child process inherits the file descriptors, 
> among them those of the taps and /dev/tpm0. The subsequent execve 
> keeps the file descriptor open. QEMU then reads the TPM file 
> descriptor from the command line into above TPMInfo->fd. This also 
> works with 'exec 100<>/dev/tpm0' via command line.
> Similar to the SELinux labeling of all the other file descriptors I 
> also use the one for the TPM device for SELinux labeling.
>
I have to correct this: The libvirt patches for this use path= on the 
command line and also apply the SELinux label on the path rather than 
the fd. So, this patch then adds file descriptor passing support to have 
equivalent functionality to other devices.

Regards,
    Stefan