From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Avi Kivity <avi@qumranet.com>
Subject: Re: [RESEND 2][PATCH 4/4] Modify KVM to update guest =?iso-8859-1?q?time=09accounting=2E?=
Date: Mon, 15 Oct 2007 13:33:20 +0200
User-Agent: KMail/1.9.7
Cc: Laurent Vivier <Laurent.Vivier@bull.net>, Ingo Molnar <mingo@elte.hu>,
       linux-kernel <linux-kernel@vger.kernel.org>
References: <46E550EF.5080209@bull.net> <471346B0.8050102@bull.net> <47134BCE.1080306@qumranet.com>
In-Reply-To: <47134BCE.1080306@qumranet.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200710151333.21078.borntraeger@de.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1008
Lines: 21

Am Montag, 15. Oktober 2007 schrieb Avi Kivity:
> We can clear it a bit later, after local_irq_enable() in __vcpu_run().  
> However we need a nop instruction first because "sti" keeps interrupts 
> disabled for one more instruction.

Ah, I see. The host interrupt  behaves different and instead of running the
interrupt handler, it exits the vmrun on x86? The interrupt handler will be
called some cycles after the sti?
That is different to s390. We can run the guest code for a long time and the
host instruction pointer stays on the sie instruction. That means, we can 
interrupt sie and continue by simply setting the instrution pointer (PSW) 
back to the sie instruction.

Any idea how to make this proper on all architectures? I will have a look.

Christian
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/