On 21/11/19 16:34, Yang Weijiang wrote: > On Thu, Nov 21, 2019 at 11:04:51AM +0100, Paolo Bonzini wrote: >> On 19/11/19 09:49, Yang Weijiang wrote: >>> @@ -228,6 +228,7 @@ >>> #define X86_FEATURE_FLEXPRIORITY ( 8*32+ 2) /* Intel FlexPriority */ >>> #define X86_FEATURE_EPT ( 8*32+ 3) /* Intel Extended Page Table */ >>> #define X86_FEATURE_VPID ( 8*32+ 4) /* Intel Virtual Processor ID */ >>> +#define X86_FEATURE_SPP ( 8*32+ 5) /* Intel EPT-based Sub-Page Write Protection */ >> >> Please do not include X86_FEATURE_SPP. In general I don't like the VMX >> features word, but apart from that SPP is not a feature that affects all >> VMs in the same way as EPT or FlexPriority. >> > So what's a friendly way to let a user check if SPP feature is there? QEMU for example ships with a program called vmxcap (though it requires root). We also could write a program to analyze the KVM capabilities and print them, and put it in tools/kvm. Thanks, Paolo
