Can you still reproduce this issue with the latest version of QEMU?
Looking at
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=0723cc8a5558c94388 for
example, it might have been fixed since QEMU v4.2...
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1693667
Title:
-cpu haswell / broadwell have no MONITOR in features1
Status in QEMU:
Incomplete
Bug description:
In qemu 2.9.0 if you run
qemu-system-x86_64 -cpu Broadwell (or Haswell)
then the CPU features1 flag include the SSE3 bit, but do NOT include
the MONITOR/MWAIT bit. This is so even when the host includes the
features.
Additionally, running qemu in this manner results in several error messages:
warning: TCG doesn't support requested feature: CPUID.01H:ECX.fma [bit 12]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.pcid [bit 17]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadline
[bit 24]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.avx [bit 28]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.f16c [bit 29]
warning: TCG doesn't support requested feature: CPUID.01H:ECX.rdrand [bit 30]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.hle [bit 4]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.avx2 [bit 5]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.rtm [bit 11]
warning: TCG doesn't support requested feature: CPUID.07H:EBX.rdseed [bit 18]
warning: TCG doesn't support requested feature:
CPUID.80000001H:ECX.3dnowprefetch
(Among possible other uses, the lack of the MONITOR feature bit causes NetBSD
to fall-back on a
check-and-pause loop while an application CPU is waiting to be told to
proceed by the boot CPU.)
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