52 lines
2.1 KiB

From b662e6fd7169f31ef664ecd0b0b45547462e1e31 Mon Sep 17 00:00:00 2001
From: Stefan Berger <>
Date: Tue, 4 Jan 2022 14:45:31 -0500
Subject: [PATCH] tpm2: When writing state initialize s_ContextSlotMask if not
If s_ContextSlotMask was not set since the TPM 2 was not initialized
by a call to TPM_Manufacture() or the state was not resumed, then
initialize the s_ContextSlotMask to 0xffff.
This situation can occur if a VM with an attached swtpm was started
and the VM's firmware either doesn't support TPM or didn't get to
initialize the vTPM.
The following commands recreated the issue with a SeaBIOS-only VM that
had no attached hard disk but an attached TPM 2:
virsh start BIOS-only-VM ; virsh save BIOS-only-VM save.bin ; \
virsh restore save.bin
Error: Failed to restore domain from save.bin
error: internal error: qemu unexpectedly closed the monitor: \
2022-01-04T19:26:18.835851Z qemu-system-x86_64: tpm-emulator: Setting the stateblob (type 2) failed with a TPM error 0x3 a parameter is bad
2022-01-04T19:26:18.835899Z qemu-system-x86_64: error while loading state for instance 0x0 of device 'tpm-emulator'
2022-01-04T19:26:18.835929Z qemu-system-x86_64: load of migration failed: Input/output error
Signed-off-by: Stefan Berger <>
src/tpm2/NVMarshal.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/tpm2/NVMarshal.c b/src/tpm2/NVMarshal.c
index 996c73c..c7cd1e0 100644
--- a/src/tpm2/NVMarshal.c
+++ b/src/tpm2/NVMarshal.c
@@ -1422,6 +1422,11 @@ STATE_RESET_DATA_Marshal(STATE_RESET_DATA *data, BYTE **buffer, INT32 *size)
written += UINT16_Marshal(&array_size, buffer, size);
for (i = 0; i < array_size; i++)
written += UINT16_Marshal(&data->contextArray[i], buffer, size);
+ if (s_ContextSlotMask != 0x00ff && s_ContextSlotMask != 0xffff) {
+ /* TPM wasn't initialized, so s_ContextSlotMask wasn't set */
+ s_ContextSlotMask = 0xffff;
+ }
written += UINT16_Marshal(&s_ContextSlotMask, buffer, size);
written += UINT64_Marshal(&data->contextCounter, buffer, size);