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+
+MacOS host qemu-system-x86_64 -cpu host not working
+
+MacOS: 10.15.4
+uname -a: Linux door 4.15.0-96-generic #97-Ubuntu SMP Wed Apr 1 03:25:46 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
+
+I am using qemu on mac host, with ubuntu client.
+
+I used to have "-cpu host" in my qemu command as follow:-
+
+qemu-system-x86_64 \
+-no-user-config \
+-nodefaults \
+-name u64d01 \
+-show-cursor \
+-M q35,accel=hvf,usb=off,vmport=off \
+-cpu host \
+-m 8192M \
+-smp 4 \
+-rtc base=utc,clock=host \
+-device virtio-blk-pci,drive=ssd1 \
+-drive id=ssd1,file=/Users/js/code/vm/qemu/u64d01.qcow2,if=none,format=qcow2 \
+-device virtio-net-pci,netdev=nic1,mac=52:54:98:76:54:33 \
+-netdev user,id=nic1,ipv4=on,ipv6=on,hostname=u64d01,hostfwd=tcp::2222-:22 \
+-device virtio-tablet-pci \
+-device virtio-vga \
+-device ich9-intel-hda,id=snd,msi=on \
+-device hda-output,id=snd-codec0,bus=snd.0,cad=0,audiodev=snd0 \
+-audiodev coreaudio,id=snd0
+
+Base on log of one of the vm, it was definitely working on 2020-01-17(base on journal inside vm), with qemu 4.2.0, which I installed with brew.
+
+The only way to make it work is to remove "-cpu host".
+
+Already tried with 4.1.1, 4.2 and 5.0rc2. Same result.
+
+To reproduce, try above with a Ubuntu 18.04 installation cd. Client will crash during kernel loading.
+
+
+
+I found that things were unstable unless the following were also added
+-cpu Nehalem,-rdtscp
+(the CPU can be higher than Nehalem but obviously your host CPU actually has to be equal or greater too)
+
+-rdtscp is a known issue that has since been workedaround (see bug #1894836 ).
+
+The QEMU project is currently moving its bug tracking to another system.
+For this we need to know which bugs are still valid and which could be
+closed already. Thus we are setting older bugs to "Incomplete" now.
+
+If you still think this bug report here is valid, then please switch
+the state back to "New" within the next 60 days, otherwise this report
+will be marked as "Expired". Or please mark it as "Fix Released" if
+the problem has been solved with a newer version of QEMU already.
+
+Thank you and sorry for the inconvenience.
+
+
+[Expired for QEMU because there has been no activity for 60 days.]
+