Hi,
I am using CUSE-TPM based on
https://github.com/stefanberger/qemu-tpmbranch: 2.4.1+tpm
https://github.com/stefanberger/swtpm
https://github.com/ts468/seabios-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 observingthe sameissue on Win 10 guest and on using
ACPIdump utility in Windows guest I canstill see"IRQ5 and IRQNoFlags" in
the ssdt.dsl code.
Device (ISA.TPM)
{
Name (_HID, EisaId ("PNP0C31")) // _HID: Hardware ID
Name (_STA, 0x0F) // _STA: Status
Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
{
Memory32Fixed (ReadWrite,
0xFED40000, // Address Base
0x00005000, // Address Length
)
IRQNoFlags ()
{5}
})
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: TPM: add MMIO
ACPI_BUILD: init ACPI tables
ACPI_BUILD: TPM: add MMIO
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 .
Thanks
Anshul Makkar
