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100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/* libguestfs
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* Copyright (C) 2009-2025 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* The appliance choice of CPU model.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "guestfs.h"
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#include "guestfs-internal.h"
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/**
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* Return the right CPU model to use as the qemu C<-cpu> parameter or
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* its equivalent in libvirt. This returns:
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*
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* =over 4
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*
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* =item C<"host">
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*
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* The literal string C<"host"> means use C<-cpu host>.
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*
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* =item C<"max">
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*
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* The literal string C<"max"> means use C<-cpu max> (the best
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* possible). This requires awkward translation for libvirt.
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*
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* =item some string
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*
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* Some string such as C<"cortex-a57"> means use C<-cpu cortex-a57>.
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*
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* =item C<NULL>
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*
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* C<NULL> means no C<-cpu> option at all. Note returning C<NULL>
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* does not indicate an error.
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*
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* =back
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*
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* This is made unnecessarily hard and fragile because of two stupid
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* choices in QEMU:
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*
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* =over 4
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*
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* =item *
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*
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* The default for C<qemu-system-aarch64 -M virt> is to emulate a
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* C<cortex-a15> (WTF?).
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*
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* =item *
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*
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* We don't know for sure if KVM will work, but C<-cpu host> is broken
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* with TCG, so we almost always pass a broken C<-cpu> flag if KVM is
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* semi-broken in any way.
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*
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* =back
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*/
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const char *
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guestfs_int_get_cpu_model (int kvm)
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{
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#if defined(__aarch64__)
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/* With -M virt, the default -cpu is cortex-a15. Stupid. */
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if (kvm)
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return "host";
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else
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return "cortex-a57";
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#elif defined(__powerpc64__)
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/* See discussion in https://bugzilla.redhat.com/show_bug.cgi?id=1605071 */
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return NULL;
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#elif defined(__riscv)
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/* qemu-system-riscv64 (7.0) doesn't yet support -cpu max */
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return NULL;
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#elif defined(__loongarch64)
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/* qemu-system-loongarch64 doesn't yet support -cpu max */
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return NULL;
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#else
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/* On most architectures we can use "max" to get the best possible CPU.
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* For recent qemu this should work even on TCG.
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*/
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return "max";
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#endif
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}
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