linux-kernel - Re: [PATCH] KVM: x86: fix kvmclock breakage from timers branch merge

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Message-ID: <5408CEDA.7090209@canonical.com>
Date:	Thu, 04 Sep 2014 15:43:06 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org
CC:	kvm@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH] KVM: x86: fix kvmclock breakage from timers branch merge



On 09/04/2014 03:40 PM, Paolo Bonzini wrote:
> Il 04/09/2014 22:37, Chris J Arges ha scritto:
>>>> -	boot_ns = ktime_to_ns(ktime_add(tk->tkr.base_mono, tk->offs_boot));
>>>> +	boot_ns = ktime_to_ns(ktime_sub(tk->offs_real, tk->offs_boot));
>>>>  
>>>>  	write_seqcount_begin(&vdata->seq);
>>>>
>>>> If it doesn't work, then commit 02cba1598a2a3b689e79ad6dad2532521f638271
>>>> is also broken.
>>>>
>>>> Paolo
>>>>
>> Paolo,
>> That modification do your additional patch didn't work. However I was
>> able to modify the code as follows to get this test case working. The
>> only additional modification was:
>> +	vdata->nsec_base		= tk->xtime_sec * (u64)NSEC_PER_SEC
>> +					- boot_ns;
> 
> Right, it should have been
> 
> 	boot_ns = ktime_to_ns(ktime_sub(tk->offs_boot, tk->offs_real));
> 
> I'll post the patch shortly.
> 
> Thanks!
> 
> Paolo
> 

Paolo,

Great, tested that modification really quick and it also works for me!
All test cases are now passing on my machine; thanks for all the
debugging and help.

--chris
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