[Qemu-devel] question about "warning: TCG doesn't support requested feature: CPUID.01H:ECX.f16c "

[Wangjintang]

Hi all,

        We run application with qemu, get the below error, the reason is that " 
TCG doesn't support requested feature: CPUID.01H:ECX.f16c ".
Does TCG in qemu support " CPUID.01H:ECX.f16c "? 
If TCG in qemu support, then how to use?  Thanks.

$ sudo  ./qemu-2.11.1_bin/bin/qemu-system-x86_64 -cpu Skylake-Server -M q35 -m 
4096 -smp 1 -nographic  -kernel bzImage-4.4.0 -initrd 
initrd.img-4.4.0-31-generic  -append "root=/dev/vda1 console=ttyS0" -boot d 
-drive if=virtio,file=./ubuntu2.img -net nic,model=virtio -net 
tap,ifname=tap26,script=no,downscript=no
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.01H:ECX.fma [bit 12]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.01H:ECX.pcid [bit 17]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.01H:ECX.x2apic [bit 21]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.01H:ECX.tsc-deadline [bit 24]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.01H:ECX.avx [bit 28]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.01H:ECX.f16c [bit 29]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.01H:ECX.rdrand [bit 30]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.hle [bit 4]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.avx2 [bit 5]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.invpcid [bit 10]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.rtm [bit 11]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.avx512f [bit 16]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.avx512dq [bit 17]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.rdseed [bit 18]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.avx512cd [bit 28]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.avx512bw [bit 30]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.07H:EBX.avx512vl [bit 31]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.80000001H:ECX.3dnowprefetch [bit 8]
qemu-system-x86_64: warning: TCG doesn't support requested feature: 
CPUID.0DH:EAX.xsavec [bit 1]
SeaBIOS (version rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org)
 

Regards,
Wang Jintang