linux-kernel - Re: [PATCH] KVM: LAPIC: Also cancel preemption timer when disarm LAPIC timer

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Message-ID: <708f1914-be5e-91a0-2fdf-8d34b78ca7da@redhat.com>
Date:   Wed, 25 Mar 2020 16:55:40 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH] KVM: LAPIC: Also cancel preemption timer when disarm
 LAPIC timer

On 24/03/20 07:32, Wanpeng Li wrote:
>  			hrtimer_cancel(&apic->lapic_timer.timer);
> +			preempt_disable();
> +			if (apic->lapic_timer.hv_timer_in_use)
> +				cancel_hv_timer(apic);
> +			preempt_enable();
>  			kvm_lapic_set_reg(apic, APIC_TMICT, 0);
>  			apic->lapic_timer.period = 0;
>  			apic->lapic_timer.tscdeadline = 0;

There are a few other occurrences of hrtimer_cancel, and all of them
probably have a similar issue.  What about adding a cancel_apic_timer
function that contains the combination of
hrtimer_cancel/preempt_disable/cancel_hv_timer/preempt_enable?

Thanks,

Paolo