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?
Paolo
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> ---
> arch/x86/kvm/x86.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index af6c8cf6a37a..cf397110953f 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -2173,7 +2173,7 @@ fastpath_t handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu)
> data = kvm_read_edx_eax(vcpu);
> if (!handle_fastpath_set_x2apic_icr_irqoff(vcpu, data)) {
> kvm_skip_emulated_instruction(vcpu);
> - ret = EXIT_FASTPATH_EXIT_HANDLED;
> + ret = EXIT_FASTPATH_REENTER_GUEST;
> }
> break;
> case MSR_IA32_TSC_DEADLINE:
> --
> 2.46.0.rc2.264.g509ed76dc8-goog
>
