New subject: [PATCH v10 3/6] Support for BIOS interrupt handler

27 Mar 2015

      On 03/27/2015 03:58 AM, Xu, Quan wrote:
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-----Original Message-----
From: Xu, Quan
Sent: Friday, March 27, 2015 10:01 AM
To: 'Stefan Berger'; Kevin O'Connor
Cc: seabios@seabios.org; stefano.stabellini@eu.citrix.com
Subject: RE: [PATCH v10 3/6] Support for BIOS interrupt handler
...
-----Original Message-----
From: Stefan Berger [mailto:stefanb@linux.vnet.ibm.com]
Sent: Thursday, March 26, 2015 7:04 PM
To: Xu, Quan; Kevin O'Connor
Cc: seabios@seabios.org; stefano.stabellini@eu.citrix.com
Subject: Re: [PATCH v10 3/6] Support for BIOS interrupt handler
On 03/26/2015 07:01 AM, Xu, Quan wrote:
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...
-----Original Message-----
From: Stefan Berger [mailto:stefanb@linux.vnet.ibm.com]
Sent: Thursday, March 26, 2015 6:18 PM
To: Kevin O'Connor; Xu, Quan
Cc: seabios@seabios.org; stefano.stabellini@eu.citrix.com
Subject: Re: [PATCH v10 3/6] Support for BIOS interrupt handler
On 03/25/2015 06:42 PM, Kevin O'Connor wrote:
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On Tue, Mar 24, 2015 at 11:10:03AM -0400, Stefan Berger wrote:
> On 03/23/2015 08:13 PM, Kevin O'Connor wrote:
>> Because of the mixed 16bit/32bit code in SeaBIOS, all assembler
>> must use size suffixes - so the above should be "roll" instead of "rol".
> Ok, fixed.
>
>> As before - both issues are minor and can be addressed after
>> merge (as long as there is agreement that the sha1.c file can be
>> licensed as LGPLv3).
> It can have that license. I can post v11 or you can modify it,
> either way is fine.
Thanks.  I pushed the first three patches into a test branch at:
 https://github.com/KevinOConnor/seabios/tree/tcg-testing

I'd like to get confirmation that this works for the Xen
requirements before merging.
I don't use Xen. I hope that Quan will provide feedback.
  Stefan

Sure, I am glad to help you test it :):) Try to
https://github.com/KevinOConnor/seabios/tree/tcg-testing ??
Yes.
  Stefan

Just for check,
I can NOT git clone https://github.com/KevinOConnor/seabios/tree/tcg-testing
I can clone https://github.com/KevinOConnor/seabios and checkout * tcg-testing
branch.
Correct?
Quan
Share the test result first. It is not working with Xen vTPM.
The log from vtpm mini-os:
[.. ]
tpm_testing.c:229: Debug: verify plain text
tpm_testing.c:261: Info: Self-Test succeeded
tpm_startup.c:43: Info: TPM_Startup(1)
Tpmback:Info Frontend 0/0 connected
tpm_cmd_handler.c:4217: Debug: tpm_handle_command(0)
tpm_cmd_handler.c:3514: Debug: [TPM_TAG_RQU_COMMAND]
tpm_cmd_handler.c:3537: Debug: [TPM_ORD_Startup]
tpm_startup.c:43: Info: TPM_Startup(1)
tpm_cmd_handler.c:4151: Info: TPM command failed: (0x26) The command was received in the wrong sequence
relative to TPM_Init and a subsequent TPM_Startup.
[..]
In my opinion, we need this patch for Xen vTPM too.
Which patch is 'this patch'?
Does the above indicate that TPM_Startup(1) is sent twice to the Xen 
vTPM? Besides SeaBIOS, what else is sending a TPM_Startup()? If there is 
something else in Xen that sends a TPM_Startup() to the TPM, before 
SeaBIOS does, then the following code may apply as well:
This part is from src/tcgbios.c.
+    rc = build_and_send_cmd(TPM_ORD_Startup,
+                            Startup_ST_CLEAR, sizeof(Startup_ST_CLEAR),
+                            NULL, 10, &returnCode, 
TPM_DURATION_TYPE_SHORT);
+
+    dprintf(DEBUG_tcg, "Return code from TPM_Startup = 0x%08x\n",
+            returnCode);
+
+    if (CONFIG_COREBOOT) {
Here you could add a check whether you are running on Xen and ignore the 
error returned from TPM_Startup().
+        /* with other firmware on the system the TPM may already have been
+         * initialized
+         */
+        if (returnCode == TPM_INVALID_POSTINIT)
+            returnCode = 0;
+    }
+
+    if (rc || returnCode)
+        goto err_exit;
Regards,
      Stefan
...
now Xen vTPM is working with two basic functions: TPM TCPA / SSDT and registers reset
in my previous seabios patch.
Quan
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Re: [SeaBIOS] [PATCH v10 3/6] Support for BIOS interrupt handler