From: Daan De Meyer <daan.j.demeyer@gmail.com>
Date: Wed, 20 Sep 2023 21:29:18 +0000 (+0200)
Subject: qemu: Make sure the memfd size matches the machine memory size
X-Git-Tag: v18~48^2~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a6456c2ec26c11ec50541ac7e07d95c3650120f;p=thirdparty%2Fmkosi.git

qemu: Make sure the memfd size matches the machine memory size

This is required by qemu so let's make sure it's always satisfied.
---

diff --git a/mkosi/qemu.py b/mkosi/qemu.py
index 163cdb20e..77c5187ac 100644
--- a/mkosi/qemu.py
+++ b/mkosi/qemu.py
@@ -292,9 +292,10 @@ def run_qemu(args: MkosiArgs, config: MkosiConfig) -> None:
 
     ovmf, ovmf_supports_sb = find_ovmf_firmware(config) if firmware == QemuFirmware.uefi else (None, False)
 
+    # A shared memory backend might increase ram usage so only add one if actually necessary for virtiofsd.
     shm = []
-    if config.runtime_trees:
-        shm = ["-object", "memory-backend-memfd,id=mem,size=2G,share=on"]
+    if config.runtime_trees or config.output_format == OutputFormat.directory:
+        shm = ["-object", f"memory-backend-memfd,id=mem,size={config.qemu_mem},share=on"]
 
     if config.architecture == Architecture.arm64:
         machine = f"type=virt,accel={accel}"