[Bug 1881506] [NEW] TCG doesn't support a lot of features that should be supported

[Ethin Probst]

Public bug reported:

This is quite odd, and I'm not sure about how to get around it. I'm writing an 
OS in Rust and require APIC support. When I boot my kernel with 
qemu-system-x86_64, however, it dumps out a [lot] of warnings; it claims that 
TCG doesn't support FMA, X2APIC, AVX, F16C, AVX2, RDSEED, SHA-NI, FXSR-OPT, 
misalignsse, 3dnowprefetch, osvw, topoext, perfctr-core, clzero, xsaveerptr, 
ibpb, nrip-save, xsavec, and xsaves, but prints these warnings over 80 times 
before finally doing what I told it to do. Running QEMU 5.0.0 (unknown commit 
hash), as follows:
qemu-system-x86_64 -drive 
format=raw,file=target\x86_64-kernel-none\debug\bootimage-kernel.bin -serial 
stdio -no-reboot -hdb disk.img -s -m 4G -usb -rtc base=utc,clock=host -cpu 
EPYC-v3,+acpi,+apic,+rdrand,+rdseed,+sse,+sse2,+sse4.1,+sse4.2,+sse4a,+ssse3,+syscall,+x2apic
 -smp cpus=8 -soundhw all
I would run using HAXM, but my kernel requires RDRAND, and QEMU does not, to my 
knowledge, automatically support RDRAND (and I don't know how to enable it).

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1881506

Title:
  TCG doesn't support a lot of features that should be supported

Status in QEMU:
  New

Bug description:
  This is quite odd, and I'm not sure about how to get around it. I'm writing 
an OS in Rust and require APIC support. When I boot my kernel with 
qemu-system-x86_64, however, it dumps out a [lot] of warnings; it claims that 
TCG doesn't support FMA, X2APIC, AVX, F16C, AVX2, RDSEED, SHA-NI, FXSR-OPT, 
misalignsse, 3dnowprefetch, osvw, topoext, perfctr-core, clzero, xsaveerptr, 
ibpb, nrip-save, xsavec, and xsaves, but prints these warnings over 80 times 
before finally doing what I told it to do. Running QEMU 5.0.0 (unknown commit 
hash), as follows:
  qemu-system-x86_64 -drive 
format=raw,file=target\x86_64-kernel-none\debug\bootimage-kernel.bin -serial 
stdio -no-reboot -hdb disk.img -s -m 4G -usb -rtc base=utc,clock=host -cpu 
EPYC-v3,+acpi,+apic,+rdrand,+rdseed,+sse,+sse2,+sse4.1,+sse4.2,+sse4a,+ssse3,+syscall,+x2apic
 -smp cpus=8 -soundhw all
  I would run using HAXM, but my kernel requires RDRAND, and QEMU does not, to 
my knowledge, automatically support RDRAND (and I don't know how to enable it).

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