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

[Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx>]

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>

+
+#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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