linux-kernel - Re: [RESEND 2][PATCH 4/4] Modify KVM to update guest time accounting.

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Date:	Mon, 15 Oct 2007 13:19:28 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Laurent Vivier <Laurent.Vivier@...l.net>
Cc:	Avi Kivity <avi@...ranet.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND 2][PATCH 4/4] Modify KVM to update guest time	accounting.

forgot to CC everybody besides Laurent:

Am Montag, 15. Oktober 2007 schrieben Sie:
> No, It must not be cleared here because we can't enter in the accounting code
> between kvm_guest_enter(void) and kvm_guest_exit(void).
> 
> This is why the accounting code clears it.
> 
> I put a kvm_guest_exit() only for symmetry.

Why cant we enter the accounting code?
Dont know about x86, but on s390 we can get host interrupts and reschedules
even when we run a guest (if preemption is on).

If the timer tick happens  while the guest is running, we will run the
accounting code on x86 as well, no? 


Christian



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