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diff --git a/gitlab/issues_text/target_missing/host_missing/accel_KVM/1003 b/gitlab/issues_text/target_missing/host_missing/accel_KVM/1003
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+"Cannot allocate memory" when boots a VM > 1026GB memory with -accel kvm
+Description of problem:
+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.
+Steps to reproduce:
+1. sysctl vm.overcommit_memory=1  # enable overcommit first
+2. qemu-system-x86_64 -m 1027G -accel kvm -vnc :1
+Additional information:
+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.