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Re: [Qemu-devel] CUSE-TPM : Win 10 reports TPM device doesn't have suffi

From: Anshul Makkar
Subject: Re: [Qemu-devel] CUSE-TPM : Win 10 reports TPM device doesn't have sufficient resources
Date: Fri, 21 Apr 2017 08:03:01 +0000

Yes, v2.8.0+tpm branch worked. Thanks Stefan.


From: Stefan Berger [mailto:address@hidden
Sent: 18 April 2017 19:47
To: Anshul Makkar <address@hidden>
Cc: address@hidden
Subject: Re: CUSE-TPM : Win 10 reports TPM device doesn't have sufficient 

You may want to try it from this version: 

----- Original message -----
From: anshul makkar <address@hidden<mailto:address@hidden>>
To: <address@hidden<mailto:address@hidden>>
Cc: Stefan Berger/Watson/address@hidden
Subject: CUSE-TPM : Win 10 reports TPM device doesn't have sufficient resources
Date: Tue, Apr 18, 2017 1:42 PM


I am using CUSE-TPM based on

https://github.com/stefanberger/qemu-tpm branch: 2.4.1+tpm



I am facing an issue where WIndows 10 guest device manager reports TPM status 
as @
The device status is "The device cannot find enough free resources it can use 
(Code 12)"#

On browsing I found this page  
@https://bugzilla.redhat.com/show_bug.cgi?id=1281413"; that reports exactly the 
same problem and the resolution patch @ 
https://bugzilla.redhat.com/attachment.cgi?id=1137166​ .

I applied the patch on the code and verified with debug trace that the patch 
code does executes.

But, I am still observing the same issue on Win 10 guest and on using ACPIdump 
utility in Windows guest I can still see "IRQ 5 and IRQNoFlags" in the ssdt.dsl 
 Device (ISA.TPM)
                Name (_HID, EisaId ("PNP0C31"))  // _HID: Hardware ID
                Name (_STA, 0x0F)  // _STA: Status
                Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource 
                    Memory32Fixed (ReadWrite,
                        0xFED40000,         // Address Base
                        0x00005000,         // Address Length
                    IRQNoFlags ()

I am bit confused, from my understanding, its the QEMU that builds the SSDT 
table and I can also verify it from the logs. But somehow guest is getting the 
old ACPI values for TPM which is not acceptable to Windows.

Just to be sure, I also verified the SeaBIOS code and couldn't find any link to 
this table.

Here is the patch that I applied based on the link above:

if (misc->tpm_version != TPM_VERSION_UNSPEC) {
             ACPI_BUILD_DPRINTF("TPM: add MMIO\n");
             dev = aml_device("TPM");
             aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0C31")));
             aml_append(dev, aml_name_decl("_STA", aml_int(0xF)));
             crs = aml_resource_template();
             aml_append(crs, aml_memory32_fixed(TPM_TIS_ADDR_BASE,
                        TPM_TIS_ADDR_SIZE, AML_READ_WRITE));
             aml_append(dev, aml_name_decl("_CRS", crs));
             aml_append(sb_scope, dev);
aml_append(ssdt, sb_scope);

logs once I start qemu:

CPI_BUILD: init ACPI tables
ACPI_BUILD: init ACPI tables

tpm_tis:  read.4(00000f00) = 00011014
tpm_tis: write.1(00000008) = 00000000
tpm_tis:  read.1(00000000) = 00000081

Commands to start vTPM:
swtpm_cuse -M 260 -m 1 -n vtpm0

qemu-system-x86_64 -enable-kvm -m 1024 -boot d -bios bios.bin -boot menu=on 
-tpmdev cuse-tpm,id=tpm0,path=/dev/vtpm0 -device tpm-tis,tpmdev=tpm0 win.img

Please suggest if I am missing anything .

Anshul Makkar

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