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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_missing/host_missing/accel_KVM/1003.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 1003
-title = "\"Cannot allocate memory\" when boots a VM > 1026GB memory with -accel kvm"
-state = "closed"
-created_at = "2022-04-24T02:39:33.819Z"
-closed_at = "2022-06-19T05:12:22.616Z"
-labels = ["accel: KVM", "workflow::Triaged"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/1003"
-host-os = "Debian 11.2"
-host-arch = "x86"
-qemu-version = "6.2.0"
-guest-os = "not relavant to this problem"
-guest-arch = "x86"
-description = """I can boot an empty VM using command `qemu-system-x86_64 -m 1026G -accel kvm -vnc :1` or `qemu-system-x86_64 -m 8T -vnc :1`
-
-But when I use `qemu-system-x86_64 -m 1027G -accel kvm -vnc :1`, it will not boot:
-
-```
-root@debian11:~# qemu-system-x86_64 -m 1027G -accel kvm -vnc :1
-qemu-system-x86_64: kvm_set_user_memory_region: KVM_SET_USER_MEMORY_REGION failed, slot=1, start=0x100000000, size=0x10000000000: Cannot allocate memory
-kvm_set_phys_mem: error registering slot: Cannot allocate memory
-Aborted
-```
-
-Which means, with `-accel kvm`, it only can boot a VM which memory <= 1026G, but without these args, it can boot whatever you want."""
-reproduce = """1. sysctl vm.overcommit_memory=1  # enable overcommit first
-2. qemu-system-x86_64 -m 1027G -accel kvm -vnc :1"""
-additional = """The qemu I use is compiled from the latest source, not the package provided by debian.
-
-Hardware is `PowerEdge R630` with `E5-2630 v4` * 2, 128G physical RAM."""