On Fri, Oct 30, 2015 at 05:00:57PM -0200, Eduardo Habkost wrote: > The x86 change to make "check" mode be enabled by default made QEMU print a > warning in the default case if running in an Intel host: > > $ qemu-system-x86_64 -machine pc,accel=kvm > warning: host doesn't support requested feature: CPUID.80000001H:ECX.sse4a > [bit 6] > > Fix this by not enabling sse4a in qemu64 when in KVM mode. > > The long term solution will probably involve creating separate "tcg64" and > "kvm64" CPU models as defaults, so we can finally choose completely diffferent > defaults in the KVM- and TCG-specific models without making the > kvm_default_props list grow too mcuh.
Note that we can have a much simpler solution to this: disabling SSE4A on qemu64 completely, even on TCG. This way we can use PC_COMPAT_2_4 instead of the kvm_default_props compat hack. We can reenable SSE4A for TCG later (more exactly, we could enable everything from TCG_*_FEATURES) when we implement the kvm64/tcg64 solution. What do you think? -- Eduardo
