Re: [PATCH 15/17] KVM: retpolines: x86: eliminate retpoline from vmx.c exit handlers

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Andrea Arcangeli <aarcange@xxxxxxxxxx> writes:

> It's enough to check the exit value and issue a direct call to avoid
> the retpoline for all the common vmexit reasons.
>
> Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> ---
>  arch/x86/kvm/vmx/vmx.c | 24 ++++++++++++++++++++++--
>  1 file changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index a6e597025011..9aa73e216df2 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -5866,9 +5866,29 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
>  	}
>  
>  	if (exit_reason < kvm_vmx_max_exit_handlers
> -	    && kvm_vmx_exit_handlers[exit_reason])
> +	    && kvm_vmx_exit_handlers[exit_reason]) {
> +#ifdef CONFIG_RETPOLINE
> +		if (exit_reason == EXIT_REASON_MSR_WRITE)
> +			return handle_wrmsr(vcpu);
> +		else if (exit_reason == EXIT_REASON_PREEMPTION_TIMER)
> +			return handle_preemption_timer(vcpu);
> +		else if (exit_reason == EXIT_REASON_PENDING_INTERRUPT)
> +			return handle_interrupt_window(vcpu);
> +		else if (exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT)
> +			return handle_external_interrupt(vcpu);
> +		else if (exit_reason == EXIT_REASON_HLT)
> +			return handle_halt(vcpu);
> +		else if (exit_reason == EXIT_REASON_PAUSE_INSTRUCTION)
> +			return handle_pause(vcpu);
> +		else if (exit_reason == EXIT_REASON_MSR_READ)
> +			return handle_rdmsr(vcpu);
> +		else if (exit_reason == EXIT_REASON_CPUID)
> +			return handle_cpuid(vcpu);
> +		else if (exit_reason == EXIT_REASON_EPT_MISCONFIG)
> +			return handle_ept_misconfig(vcpu);
> +#endif
>  		return kvm_vmx_exit_handlers[exit_reason](vcpu);

I agree with the identified set of most common vmexits, however, this
still looks a bit random. Would it be too much if we get rid of
kvm_vmx_exit_handlers completely replacing this code with one switch()?

> -	else {
> +	} else {
>  		vcpu_unimpl(vcpu, "vmx: unexpected exit reason 0x%x\n",
>  				exit_reason);
>  		dump_vmcs();

-- 
Vitaly



[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux