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Re: [libvirt] [PATCH] qemu: Pass file descriptor when using TPM passthrough



On 09/08/2014 09:05 PM, Stefan Berger wrote:
From: Stefan Berger <stefanb linux vnet ibm com>

Pass the TPM file descriptor to QEMU via command line.
Instead of passing /dev/tpm0 we now pass /dev/fdset/10 and the additional
parameters -add-fd set=10,fd=20.

This addresses the use case when QEMU is started with non-root privileges
and QEMU cannot open /dev/tpm0 for example.

One problem is that for the passing of the file descriptor set to work,
virCommandReorderFDs must not be called on the virCommand. This is prevented
by setting a flag in the virCommandPassFDGetFDIndex that is checked to be
clear when virCommandReorderFDs is run.

Signed-off-by: Stefan Berger <stefanb linux vnet ibm com>
---
  src/libvirt_private.syms |   1 +
  src/qemu/qemu_command.c  | 132 ++++++++++++++++++++++++++++++++++++++++++++---
  src/util/vircommand.c    |  33 ++++++++++++
  src/util/vircommand.h    |   3 ++
  4 files changed, 162 insertions(+), 7 deletions(-)

Does anyone have comments?

    Stefan


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