From: Daan De Meyer <daan.j.demeyer@gmail.com>
Date: Mon, 8 Apr 2024 20:32:06 +0000 (+0200)
Subject: Allow setting QemuSmp=0 to use all available CPUs
X-Git-Tag: v23~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b603426da726d27dca8ed2e4cdad25b667553ce2;p=thirdparty%2Fmkosi.git

Allow setting QemuSmp=0 to use all available CPUs
---

diff --git a/mkosi/qemu.py b/mkosi/qemu.py
index 07e4e46f3..e32b3b485 100644
--- a/mkosi/qemu.py
+++ b/mkosi/qemu.py
@@ -808,7 +808,7 @@ def run_qemu(args: Args, config: Config) -> None:
     cmdline: list[PathString] = [
         find_qemu_binary(config),
         "-machine", machine,
-        "-smp", str(config.qemu_smp),
+        "-smp", str(config.qemu_smp or os.cpu_count()),
         "-m", f"{config.qemu_mem // 1024**2}M",
         "-object", "rng-random,filename=/dev/urandom,id=rng0",
         "-device", "virtio-rng-pci,rng=rng0,id=rng-device0",
diff --git a/mkosi/resources/mkosi.md b/mkosi/resources/mkosi.md
index 762955c7d..15218de10 100644
--- a/mkosi/resources/mkosi.md
+++ b/mkosi/resources/mkosi.md
@@ -1530,6 +1530,9 @@ boolean argument: either `1`, `yes`, or `true` to enable, or `0`, `no`,
 : When used with the `qemu` verb, this options sets `qemu`'s `-smp`
   argument which controls the number of guest's CPUs. Defaults to `2`.
 
+: When set to `0`, the number of CPUs available to the mkosi process
+  will be used.
+
 `QemuMem=`, `--qemu-mem=`
 
 : When used with the `qemu` verb, this options sets `qemu`'s `-m`
diff --git a/mkosi/vmspawn.py b/mkosi/vmspawn.py
index c1b910f99..ecef21a2c 100644
--- a/mkosi/vmspawn.py
+++ b/mkosi/vmspawn.py
@@ -51,7 +51,7 @@ def run_vmspawn(args: Args, config: Config) -> None:
 
     cmdline: list[PathString] = [
         "systemd-vmspawn",
-        "--cpus", str(config.qemu_smp),
+        "--cpus", str(config.qemu_smp or os.cpu_count()),
         "--ram", str(config.qemu_mem),
         "--kvm", config.qemu_kvm.to_tristate(),
         "--vsock", config.qemu_vsock.to_tristate(),