Re: [Xen-devel] [PATCH v6 5/6] Qemu-Xen-vTPM: Qemu vTPM xenstubdoms backen.

["Xu, Quan" <quan.xu@xxxxxxxxx>]

> -----Original Message-----
> From: Stefan Berger [mailto:stefanb@xxxxxxxxxxxxxxxxxx]
> Sent: Monday, May 04, 2015 11:30 PM
> To: Xu, Quan; stefano.stabellini@xxxxxxxxxxxxx; eblake@xxxxxxxxxx
> Cc: qemu-devel@xxxxxxxxxx; wei.liu2@xxxxxxxxxx; dgdegra@xxxxxxxxxxxxx;
> xen-devel@xxxxxxxxxxxxx
> Subject: Re: [PATCH v6 5/6] Qemu-Xen-vTPM: Qemu vTPM xenstubdoms
> backen.
> 
> On 05/04/2015 03:23 AM, Quan Xu wrote:
> > This Patch provides the glue for the TPM_TIS(Qemu frontend) to Xen
> > stubdom vTPM domain that provides the actual TPM functionality. It
> > sends data and TPM commends with xen_vtpm_frontend. It is similar as
> > another two vTPM backens:
> >    *vTPM passthrough backen Since QEMU 1.5.
> >    *vTPM libtpms-based backen.
> >
> > Some details:
> > This part of the patch provides support for the spawning of a thread
> > that will interact with stubdom vTPM domain by the xen_vtpm_frontend.
> > It expects a signal from the frontend to wake and pick up the TPM
> > command that is supposed to be processed and delivers the response
> > packet using a callback function provided by the frontend.
> >
> > The backend connects itself to the frontend by filling out an
> > interface structure with pointers to the function implementing support
> > for various operations.
> >
> > (QEMU) vTPM XenStubdoms backen is initialized by Qemu command line
> options,
> >        "-tpmdev xenstubdoms,id=xenvtpm0 -device
> tpm-tis,tpmdev=xenvtpm0"
> >
> > Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
> 
> Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx>
> 

Stefan, thanks again for your help and review. I will add the below code in 
next version.


thanks
Quan
> +
> +#ifdef DEBUG_TPM
> +#define DPRINTF(fmt, ...) \
> +    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) #else
> +#define DPRINTF(fmt, ...) \
> +    do { } while (0)
> +#endif
> 
> 
> In case some other parts needs revision, please use the following instead:
> 
> #define DEBUG_TPM 0
> 
> #define DPRINTF(fmt, ...) do { \
>      if (DEBUG_TPM) { \
>          fprintf(stderr, fmt, ## __VA_ARGS__); \
>      } \
> } while (0);
> 
> 
>     Stefan


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