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python/qemu: accel: Add list_accel() method

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Since commit cbe6d6365a the command `qemu -accel help` returns
the list of accelerators enabled in the QEMU binary. This adds
the list_accel() method which return that same list.

Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20191216191438.93418-3-wainersm@redhat.com>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Tested-by: Cleber Rosa <crosa@redhat.com>
Signed-off-by: Cleber Rosa <crosa@redhat.com>
This commit is contained in:
Wainer dos Santos Moschetta 2019-12-16 16:14:35 -03:00 committed by Cleber Rosa
parent 8b272e0018
commit 1650c3e304
1 changed files with 23 additions and 0 deletions
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23
python/qemu/accel.py
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@ -14,7 +14,11 @@
# the COPYING file in the top-level directory. # the COPYING file in the top-level directory.
# #
import logging
import os import os
import subprocess
LOG = logging.getLogger(__name__)
# Mapping host architecture to any additional architectures it can # Mapping host architecture to any additional architectures it can
# support which often includes its 32 bit cousin. # support which often includes its 32 bit cousin.
@ -23,6 +27,25 @@
"aarch64" : "armhf" "aarch64" : "armhf"
} }
def list_accel(qemu_bin):
"""
List accelerators enabled in the QEMU binary.
@param qemu_bin (str): path to the QEMU binary.
@raise Exception: if failed to run `qemu -accel help`
@return a list of accelerator names.
"""
if not qemu_bin:
return []
try:
out = subprocess.check_output([qemu_bin, '-accel', 'help'],
universal_newlines=True)
except:
LOG.debug("Failed to get the list of accelerators in %s", qemu_bin)
raise
# Skip the first line which is the header.
return [acc.strip() for acc in out.splitlines()[1:]]
def kvm_available(target_arch=None): def kvm_available(target_arch=None):
host_arch = os.uname()[4] host_arch = os.uname()[4]
if target_arch and target_arch != host_arch: if target_arch and target_arch != host_arch: