Re: [PATCH 2/2] KVM: VMX: Add Force Emulation Prefix for "emulate the next instruction"

[Paolo Bonzini]

On 27/03/2018 11:05, Nikita Leshenko wrote:
> What you are essentially trying to do is create a PV interface to access
> the x86 emulator.
> Why not use a simple hypercall (VMCALL) to accomplish this instead of
> inventing yet another PV method?

Because hypercalls force you to use %rax for the hypercall number.

Paolo

> Something like âKVM_HC_EMULATE_NEXT_INSTRUCTIONâ in kvm_emulate_hypercall
> should do the trick (however it needs to be placed before the check for
> CPL>0 so that user mode code can test the emulator too).
> 
> Nikita