When running qemu-i386 even with -cpu Nehalem (aka x86_64-v2), it raises the warning
TCG doesn't support requested feature: CPUID.80000001H:EDX.lm [bit 29] Likewise using qemu-x86_64 with -cpu Haswell, it raises warnings for TCG doesn't support requested feature: CPUID.01H:ECX.pcid [bit 17] TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21] TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24] TCG doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10] Even though x86_64-v3 is the level that qemu-user is supposed to provide. These are two related problems: - for Haswell, the 4 missing features are only relevant to code running in kernel mode; we can ignore them and mark them as supported even though they are not. The supported features are only used to print the warnings - for qemu-i386, the issue is that the i386 target is not about running programs on a 32-bit processor, but rather running programs using the 32-bit kernel ABI on any processor; the behavior of the processor in compatibility (32-bit) mode is independent of the LM feature. Therefore, LM can also be treated as a feature that is only relevant in kernel mode. Other CPU models have warnings for the ARCH_CAPABILITIES MSR; hide them as well in a similar manner. Based-on: <20230618215114.107337-1-pbonz...@redhat.com> Paolo Bonzini (2): target/i386: ignore ARCH_CAPABILITIES features in user mode emulation target/i386: ignore CPL0-specific features in user mode emulation target/i386/cpu.c | 95 ++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 86 insertions(+), 9 deletions(-) -- 2.40.1
