51aa9d127d
On ppc64le, the accel.kvm_available() check may wrongly
return False because the host arch (as returned by os.uname[4])
and the target arch (ppc64) mismatch. In order to solve this
it is added an ppc64le -> ppc64 mapping which is used as an
fallback verification.
Fixes: 53a049d7d7
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200205203250.30526-5-wainersm@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
"""
|
|
QEMU accel module:
|
|
|
|
This module provides utilities for discover and check the availability of
|
|
accelerators.
|
|
"""
|
|
# Copyright (C) 2015-2016 Red Hat Inc.
|
|
# Copyright (C) 2012 IBM Corp.
|
|
#
|
|
# Authors:
|
|
# Fam Zheng <famz@redhat.com>
|
|
#
|
|
# This work is licensed under the terms of the GNU GPL, version 2. See
|
|
# the COPYING file in the top-level directory.
|
|
#
|
|
|
|
import logging
|
|
import os
|
|
import subprocess
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
# Mapping host architecture to any additional architectures it can
|
|
# support which often includes its 32 bit cousin.
|
|
ADDITIONAL_ARCHES = {
|
|
"x86_64" : "i386",
|
|
"aarch64" : "armhf",
|
|
"ppc64le" : "ppc64",
|
|
}
|
|
|
|
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, qemu_bin=None):
|
|
"""
|
|
Check if KVM is available using the following heuristic:
|
|
- Kernel module is present in the host;
|
|
- Target and host arches don't mismatch;
|
|
- KVM is enabled in the QEMU binary.
|
|
|
|
@param target_arch (str): target architecture
|
|
@param qemu_bin (str): path to the QEMU binary
|
|
@return True if kvm is available, otherwise False.
|
|
"""
|
|
if not os.access("/dev/kvm", os.R_OK | os.W_OK):
|
|
return False
|
|
if target_arch:
|
|
host_arch = os.uname()[4]
|
|
if target_arch != host_arch:
|
|
if target_arch != ADDITIONAL_ARCHES.get(host_arch):
|
|
return False
|
|
if qemu_bin and "kvm" not in list_accel(qemu_bin):
|
|
return False
|
|
return True
|
|
|
|
def tcg_available(qemu_bin):
|
|
"""
|
|
Check if TCG is available.
|
|
|
|
@param qemu_bin (str): path to the QEMU binary
|
|
"""
|
|
return 'tcg' in list_accel(qemu_bin)
|