* c/s 21886 change to DMAR table hiding
@ 2010-10-29 6:06 Cihula, Joseph
2010-10-29 6:54 ` Juergen Gross
0 siblings, 1 reply; 2+ messages in thread
From: Cihula, Joseph @ 2010-10-29 6:06 UTC (permalink / raw)
To: Xen-devel; +Cc: Wang, Shane, Kay, Allen M, Keir Fraser
Keir,
In c/s 21886, you changed the method by which the DMAR ACPI table was hidden from dom0. Why was this change needed?
- dmar->header.signature[0] = '\0';
+ dmar->header.signature[0] = 'X';
+ dmar->header.checksum -= 'X'-'D';
I ask because tboot was using the original method to unhide/re-hide the table during S3 (because the TXT launch on S3 resume requires a valid DMAR table) and this has broken S3 w/ TXT.
Joe
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: c/s 21886 change to DMAR table hiding
2010-10-29 6:06 c/s 21886 change to DMAR table hiding Cihula, Joseph
@ 2010-10-29 6:54 ` Juergen Gross
0 siblings, 0 replies; 2+ messages in thread
From: Juergen Gross @ 2010-10-29 6:54 UTC (permalink / raw)
To: Cihula, Joseph; +Cc: Wang, Shane, Xen-devel, Kay, Allen M, Keir Fraser
On 10/29/10 08:06, Cihula, Joseph wrote:
> Keir,
>
> In c/s 21886, you changed the method by which the DMAR ACPI table was hidden from dom0. Why was this change needed?
> - dmar->header.signature[0] = '\0';
> + dmar->header.signature[0] = 'X';
> + dmar->header.checksum -= 'X'-'D';
>
> I ask because tboot was using the original method to unhide/re-hide the table during S3 (because the TXT launch on S3 resume requires a valid DMAR table) and this has broken S3 w/ TXT.
Please see discussion under
http://lists.xensource.com/archives/html/xen-devel/2010-07/msg01517.html
Problem was crash kernel not comig up with the original DMAR hide.
Juergen
--
Juergen Gross Principal Developer Operating Systems
TSP ES&S SWE OS6 Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions e-mail: juergen.gross@ts.fujitsu.com
Domagkstr. 28 Internet: ts.fujitsu.com
D-80807 Muenchen Company details: ts.fujitsu.com/imprint.html
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2010-10-29 6:54 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-10-29 6:06 c/s 21886 change to DMAR table hiding Cihula, Joseph
2010-10-29 6:54 ` Juergen Gross
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.