The path to the image file in the local filesystem
@item aio
Specifies the AIO backend (threads/native, default: threads)
+@item locking
+Specifies whether the image file is protected with Linux OFD / POSIX locks. The
+default is to use the Linux Open File Descriptor API if available, otherwise no
+lock is applied. (auto/on/off, default: auto)
@end table
Example:
@example
"-tpmdev passthrough,id=id[,path=path][,cancel-path=path]\n"
" use path to provide path to a character device; default is /dev/tpm0\n"
" use cancel-path to provide path to TPM's cancel sysfs entry; if\n"
- " not provided it will be searched for in /sys/class/misc/tpm?/device\n",
+ " not provided it will be searched for in /sys/class/misc/tpm?/device\n"
+ "-tpmdev emulator,id=id,chardev=dev\n"
+ " configure the TPM device using chardev backend\n",
QEMU_ARCH_ALL)
STEXI
@item -tpmdev @var{backend} ,id=@var{id} [,@var{options}]
@findex -tpmdev
-Backend type must be:
-@option{passthrough}.
+Backend type must be either one of the following:
+@option{passthrough}, @option{emulator}.
The specific backend type will determine the applicable options.
The @code{-tpmdev} option creates the TPM backend and requires a
Note that the @code{-tpmdev} id is @code{tpm0} and is referenced by
@code{tpmdev=tpm0} in the device option.
+@item -tpmdev emulator, id=@var{id}, chardev=@var{dev}
+
+(Linux-host only) Enable access to a TPM emulator using Unix domain socket based
+chardev backend.
+
+@option{chardev} specifies the unique ID of a character device backend that provides connection to the software TPM server.
+
+To create a TPM emulator backend device with chardev socket backend:
+@example
+
+-chardev socket,id=chrtpm,path=/tmp/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device tpm-tis,tpmdev=tpm0
+
+@end example
+
@end table
ETEXI