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xen-devel
Re: [Xen-devel] c/s 21886 change to DMAR table hiding
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To: |
"Cihula, Joseph" <joseph.cihula@xxxxxxxxx> |
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Subject: |
Re: [Xen-devel] c/s 21886 change to DMAR table hiding |
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From: |
Juergen Gross <juergen.gross@xxxxxxxxxxxxxx> |
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Date: |
Fri, 29 Oct 2010 08:54:27 +0200 |
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Cc: |
"Wang, Shane" <shane.wang@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Delivery-date: |
Thu, 28 Oct 2010 23:55:06 -0700 |
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v=1; a=rsa-sha256; c=simple/simple; d=ts.fujitsu.com; i=juergen.gross@xxxxxxxxxxxxxx; q=dns/txt; s=s1536b; t=1288335269; x=1319871269; h=message-id:date:from:mime-version:to:cc:subject: references:in-reply-to:content-transfer-encoding; z=Message-ID:=20<4CCA6FA3.4090607@xxxxxxxxxxxxxx>|Date:=20 Fri,=2029=20Oct=202010=2008:54:27=20+0200|From:=20Juergen =20Gross=20<juergen.gross@xxxxxxxxxxxxxx>|MIME-Version: =201.0|To:=20"Cihula,=20Joseph"=20<joseph.cihula@xxxxxxxx m>|CC:=20Xen-devel=20<xen-devel@xxxxxxxxxxxxxxxxxxx>,=20 =0D=0A=20"Wang,=20Shane"=20<shane.wang@xxxxxxxxx>,=0D=0A =20"Kay,=20Allen=20M"=20<allen.m.kay@xxxxxxxxx>,=20=0D=0A =20Keir=20Fraser=20<keir.fraser@xxxxxxxxxxxxx>|Subject: =20Re:=20[Xen-devel]=20c/s=2021886=20change=20to=20DMAR =20table=20hiding|References:=20<4F65016F6CB04E49BFFA15D4 F7B798D9014EE2CB2D@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |In-Reply-To:=20<4F65016F6CB04E49BFFA15D4F7B798D9014EE2CB 2D@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> |Content-Transfer-Encoding:=207bit; bh=qc0x5S6Rm4Jxi6zuPg6VMFGCU2pAtvcav2VfcRTrX8E=; b=uDWJPlipl7wy+YllZZvm/niHSQH8JPx2IXVhCx0e7GXOVhWDjYZxsaJQ eu0U78UdefOYjgMyPK2UIXS3e/KDIUa1x1zjaZi22nVKD2rn3Qw2gN5/e oeh0TWR/VYMJf1OGy062UABPbdbxHjsMjM9n4IV47hhuGCLEZ0hQxVY5F khcf7laXr7WUy89b1/G7E75+SVuBV7FIOy/hGx7TT9FNlCa4RIoEgLPWL nRE88RbPeRsGSIeatJvTPvjny6t2F; |
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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@xxxxxxxxxxxxxx
Domagkstr. 28 Internet: ts.fujitsu.com
D-80807 Muenchen Company details: ts.fujitsu.com/imprint.html
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