109 lines
2.9 KiB
Python
109 lines
2.9 KiB
Python
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#
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# hw.py - utility functions dealing with hardware
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#
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# Copyright (C) 2022 Red Hat, Inc. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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from blivet.arch import get_arch, is_arm
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from pyanaconda.core.util import execWithCapture
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from pyanaconda.anaconda_loggers import get_module_logger
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log = get_module_logger(__name__)
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NO_SWAP_EXTRA_RAM = 200
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def minimal_memory_needed(with_gui=False, with_squashfs=False):
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"""Get minimal memory needed to run the installation.
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:return: minimal memory needed in MB (MiB?)
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"""
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if get_arch() in ["ppc64", "ppc64le"]:
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min_ram = 768
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gui_install_extra_ram = 512
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else:
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min_ram = 320
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gui_install_extra_ram = 90
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result = min_ram
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if with_gui:
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result += gui_install_extra_ram
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if with_squashfs:
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squashfs_extra_ram = 750
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result += squashfs_extra_ram
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return result
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def detect_virtualized_platform():
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"""Detect execution in a virtualized environment.
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This runs systemd-detect-virt and, if the result is not 'none',
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it returns an id of the detected virtualization technology.
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Otherwise, it returns None.
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:return: a virtualization technology identifier or None
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"""
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try:
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platform = execWithCapture("systemd-detect-virt", []).strip()
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except (OSError, AttributeError):
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return None
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if platform == "none":
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return None
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return platform
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def is_smt_enabled():
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"""Is Simultaneous Multithreading (SMT) enabled?
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:return: True or False
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"""
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from pyanaconda.flags import flags
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from pyanaconda.core.configuration.anaconda import conf
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if flags.automatedInstall \
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or not conf.target.is_hardware \
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or not conf.system.can_detect_enabled_smt:
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log.info("Skipping detection of SMT.")
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return False
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try:
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return int(open("/sys/devices/system/cpu/smt/active").read()) == 1
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except (OSError, ValueError):
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log.warning("Failed to detect SMT.")
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return False
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def is_lpae_available():
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"""Is LPAE available?
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:return: True of False
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"""
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if not is_arm():
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return False
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with open("/proc/cpuinfo", "r") as f:
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for line in f:
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if line.startswith("Features") and "lpae" in line.split():
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return True
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return False
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