linux-kernel - Re: [PATCH v4 5/5] KVM: LAPIC: add advance timer support to pi_inject

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Date:   Mon, 17 Jun 2019 23:32:01 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH v4 5/5] KVM: LAPIC: add advance timer support to
 pi_inject_timer

2019-06-17 19:24+0800, Wanpeng Li:
> From: Wanpeng Li <wanpengli@...cent.com>
> 
> Wait before calling posted-interrupt deliver function directly to add 
> advance timer support to pi_inject_timer.
> 
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Cc: Marcelo Tosatti <mtosatti@...hat.com>
> Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
> ---

Please merge this patch with [2/5], so bisection doesn't break.

>  arch/x86/kvm/lapic.c   | 6 ++++--
>  arch/x86/kvm/lapic.h   | 2 +-
>  arch/x86/kvm/svm.c     | 2 +-
>  arch/x86/kvm/vmx/vmx.c | 2 +-
>  4 files changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 1a31389..1a31ba5 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -1462,6 +1462,8 @@ static void apic_timer_expired(struct kvm_lapic *apic, bool can_pi_inject)
>  		return;
>  
>  	if (can_pi_inject && posted_interrupt_inject_timer(apic->vcpu)) {
> +		if (apic->lapic_timer.timer_advance_ns)
> +			kvm_wait_lapic_expire(vcpu, true);

>From where does kvm_wait_lapic_expire() take
apic->lapic_timer.expired_tscdeadline?

(I think it would be best to take the functional core of
 kvm_wait_lapic_expire() and make it into a function that takes the
 expired_tscdeadline as an argument.)

Thanks.