On 09/10/19 23:40, Sebastian Andrzej Siewior wrote: >>> const u32 kvm_cpuid_8000_0008_ebx_x86_features = >>> + F(XSAVEERPTR) | >>> F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) | >>> F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON); >>> >>> >> Yet another example of a patch that shouldn't be stable material (in >> this case it's fine, but there can certainly be cases where just adding >> a single flag depends on core kernel changes). > > Also, taking advantage of this feature requires changes which just > landed in qemu's master branch. That's not a big deal, every QEMU supports every kernel and vice versa. Paolo
