linux-kernel - Re: [PATCH v8] KVM: LAPIC: Apply change to TDCR right away to the timer

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Message-ID: <12d7651f-868e-aaec-6e91-a53f9819d817@redhat.com>
Date:   Fri, 6 Oct 2017 16:51:57 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH v8] KVM: LAPIC: Apply change to TDCR right away to the
 timer

On 06/10/2017 16:38, Wanpeng Li wrote:
> +	now = ktime_get();
> +	remaining = ktime_sub(apic->lapic_timer.target_expiration, now);

Still need to compare against zero here.  I guess Radim can do it.

Paolo

> +	ns_remaining_old = ktime_to_ns(remaining);
> +	ns_remaining_new = mul_u64_u32_div(ns_remaining_old,
> +                              apic->divide_count, old_divisor);
> +
> +	apic->lapic_timer.tscdeadline += nsec_to_cycles(apic->vcpu, ns_remaining_new) -
> +                                     nsec_to_cycles(apic->vcpu, ns_remaining_old);
> +	apic->lapic_timer.target_expiration = ktime_add_ns(now, ns_remaining_new);