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| author | Daniel De Graaf <dgdegra@tycho.nsa.gov> | 2013-04-11 12:20:25 -0400 |
|---|---|---|
| committer | Ian Campbell <ian.campbell@citrix.com> | 2013-04-12 14:28:17 +0100 |
| commit | f494d9f3c37542435239236085be25c820912304 (patch) | |
| tree | 571f23e359f4ba4c78c818ef288147dbd0f563ae /extras/mini-os/include | |
| parent | c1f0b214536773630cd5f16bf3d275015373555b (diff) | |
| download | xen-f494d9f3c37542435239236085be25c820912304.tar.gz xen-f494d9f3c37542435239236085be25c820912304.tar.bz2 xen-f494d9f3c37542435239236085be25c820912304.zip | |
mini-os/tpm{back, front}: Change shared page ABI
This changes the vTPM shared page ABI from a copy of the Xen network
interface to a single-page interface that better reflects the expected
behavior of a TPM: only a single request packet can be sent at any given
time, and every packet sent generates a single response packet. This
protocol change should also increase efficiency as it avoids mapping and
unmapping grants when possible. The vtpm xenbus device now requires a
feature-protocol-v2 node in xenstore to avoid conflicts with existing
(xen-patched) kernels supporting the old interface.
While the contents of the shared page have been defined to allow packets
larger than a single page (actually 4088 bytes) by allowing the client
to add extra grant references, the mapping of these extra references has
not been implemented; a feature node in xenstore may be used in the
future to indicate full support for the multi-page protocol. Most uses
of the TPM should not require this feature.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Cc: Jan Beulich <JBeulich@suse.com>
Diffstat (limited to 'extras/mini-os/include')
| -rw-r--r-- | extras/mini-os/include/tpmback.h | 1 | ||||
| -rw-r--r-- | extras/mini-os/include/tpmfront.h | 7 |
2 files changed, 5 insertions, 3 deletions
diff --git a/extras/mini-os/include/tpmback.h b/extras/mini-os/include/tpmback.h index ff8673285c..ec9eda4b57 100644 --- a/extras/mini-os/include/tpmback.h +++ b/extras/mini-os/include/tpmback.h @@ -43,6 +43,7 @@ struct tpmcmd { domid_t domid; /* Domid of the frontend */ + uint8_t locality; /* Locality requested by the frontend */ unsigned int handle; /* Handle of the frontend */ unsigned char uuid[16]; /* uuid of the tpm interface */ diff --git a/extras/mini-os/include/tpmfront.h b/extras/mini-os/include/tpmfront.h index fd2cb17fc9..a0c7c4d8b5 100644 --- a/extras/mini-os/include/tpmfront.h +++ b/extras/mini-os/include/tpmfront.h @@ -37,9 +37,7 @@ struct tpmfront_dev { grant_ref_t ring_ref; evtchn_port_t evtchn; - tpmif_tx_interface_t* tx; - - void** pages; + vtpm_shared_page_t *page; domid_t bedomid; char* nodename; @@ -77,6 +75,9 @@ void shutdown_tpmfront(struct tpmfront_dev* dev); * */ int tpmfront_cmd(struct tpmfront_dev* dev, uint8_t* req, size_t reqlen, uint8_t** resp, size_t* resplen); +/* Set the locality used for communicating with a vTPM */ +int tpmfront_set_locality(struct tpmfront_dev* dev, int locality); + #ifdef HAVE_LIBC #include <sys/stat.h> /* POSIX IO functions: |