linux-kernel - Re: [RFC patch 15/15] x86/kvm: Use GENERIC_EXIT

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Date:   Thu, 19 Sep 2019 17:40:51 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>, kvm@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [RFC patch 15/15] x86/kvm: Use GENERIC_EXIT_WORKPENDING

On 19/09/19 17:03, Thomas Gleixner wrote:
> Use the generic infrastructure to check for and handle pending work before
> entering into guest mode.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Subject should be "x86/kvm: use exit_to_guestmode".

Paolo

> ---
>  arch/x86/kvm/x86.c |   17 +++++------------
>  1 file changed, 5 insertions(+), 12 deletions(-)
> 
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -52,6 +52,7 @@
>  #include <linux/irqbypass.h>
>  #include <linux/sched/stat.h>
>  #include <linux/sched/isolation.h>
> +#include <linux/entry-common.h>
>  #include <linux/mem_encrypt.h>
>  
>  #include <trace/events/kvm.h>
> @@ -7984,8 +7985,8 @@ static int vcpu_enter_guest(struct kvm_v
>  	if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active)
>  		kvm_x86_ops->sync_pir_to_irr(vcpu);
>  
> -	if (vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu)
> -	    || need_resched() || signal_pending(current)) {
> +	if (vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) ||
> +	    exit_to_guestmode_work_pending()) {
>  		vcpu->mode = OUTSIDE_GUEST_MODE;
>  		smp_wmb();
>  		local_irq_enable();
> @@ -8178,17 +8179,9 @@ static int vcpu_run(struct kvm_vcpu *vcp
>  
>  		kvm_check_async_pf_completion(vcpu);
>  
> -		if (signal_pending(current)) {
> -			r = -EINTR;
> -			vcpu->run->exit_reason = KVM_EXIT_INTR;
> -			++vcpu->stat.signal_exits;
> +		r = exit_to_guestmode(kvm, vcpu);
> +		if (r)
>  			break;
> -		}
> -		if (need_resched()) {
> -			srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
> -			cond_resched();
> -			vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
> -		}
>  	}
>  
>  	srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
> 
>