On Tue, Sep 03, 2024, Paolo Bonzini wrote: > On Tue, Sep 3, 2024 at 5:09 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > On Mon, Sep 02, 2024, Paolo Bonzini wrote: > > > On Fri, Aug 2, 2024 at 9:51 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > > > Re-enter the guest in the fastpath if WRMSR emulation for x2APIC's ICR is > > > > successful, as no additional work is needed, i.e. there is no code unique > > > > for WRMSR exits between the fastpath and the "!= EXIT_FASTPATH_NONE" check > > > > in __vmx_handle_exit(). > > > > > > What about if you send an IPI to yourself? Doesn't that return true > > > for kvm_vcpu_exit_request() if posted interrupts are disabled? > > > > Yes, but that doesn't have anything to do with WRMSR itself, as KVM needs to morph > > EXIT_FASTPATH_EXIT_HANDLED => EXIT_FASTPATH_REENTER_GUEST if there's a pending > > event that needs requires injection. > > The other way round? i.e. treat EXIT_FASTPATH_REENTER_GUEST as > EXIT_FASTPATH_EXIT_HANDLED to go through event injection. Doh, yes.
