linux-kernel - Re: [PATCH 06/12] KVM: x86: Move TSC scaling logic out of call-back adjust_tsc

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Message-ID: <56099F9B.5090904@redhat.com>
Date:	Mon, 28 Sep 2015 22:14:19 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Haozhong Zhang <haozhong.zhang@...el.com>, kvm@...r.kernel.org
Cc:	Gleb Natapov <gleb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Joerg Roedel <joro@...tes.org>,
	Wanpeng Li <wanpeng.li@...ux.intel.com>,
	Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
	Mihai Donțu <mdontu@...defender.com>,
	Andy Lutomirski <luto@...nel.org>,
	Kai Huang <kai.huang@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/12] KVM: x86: Move TSC scaling logic out of call-back
 adjust_tsc_offset()



On 28/09/2015 07:38, Haozhong Zhang wrote:
> +
> +static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
> +					   s64 adjustment)
> +{
> +	kvm_x86_ops->adjust_tsc_offset(vcpu, adjustment, false);
> +}
> +
> +static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment)
> +{
> +	if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio)
> +		WARN_ON(adjustment < 0);
> +	adjustment = kvm_scale_tsc(vcpu, (u64) adjustment);
> +	kvm_x86_ops->adjust_tsc_offset(vcpu, adjustment, true);
> +}

You can remove the final argument to the callback (and possibly change
the callback's name to adjust_tsc_offset_guest), because it is now unused.

Paolo
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