linux-kernel - RE: [kvm-devel] [PATCH 2/3] kvmclock

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Date:	Tue, 13 Nov 2007 13:00:10 +0800
From:	"Dong, Eddie" <eddie.dong@...el.com>
To:	"Glauber de Oliveira Costa" <gcosta@...hat.com>,
	<linux-kernel@...r.kernel.org>
Cc:	<jeremy@...p.org>, <hollisb@...ibm.com>,
	<kvm-devel@...ts.sourceforge.net>, <avi@...ranet.com>
Subject: RE: [kvm-devel] [PATCH 2/3] kvmclock - the host part.


> +static void kvm_write_guest_time(struct kvm_vcpu *vcpu) +{
> +	struct timespec ts;
> +	int r;
> +
> +	if (!vcpu->clock_gpa)
> +		return;
> +
> +	/* Updates version to the next odd number, indicating
> we're writing */
> +	vcpu->hv_clock.version++;
> +	kvm_write_guest(vcpu->kvm, vcpu->clock_gpa,
> &vcpu->hv_clock, PAGE_SIZE);
> +
> +	kvm_get_msr(vcpu, MSR_IA32_TIME_STAMP_COUNTER,
> +			  &vcpu->hv_clock.last_tsc);
> +
> +	ktime_get_ts(&ts);

Do we need to disable preemption here?

> +	vcpu->hv_clock.now_ns = ts.tv_nsec + (NSEC_PER_SEC *
> (u64)ts.tv_sec); +	vcpu->hv_clock.wc_sec = get_seconds();
> +	vcpu->hv_clock.version++;
> +	kvm_write_guest(vcpu->kvm, vcpu->clock_gpa,
> &vcpu->hv_clock, PAGE_SIZE);
> +}
> +
thx,eddie
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