From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Avi Kivity <avi@qumranet.com>
Cc: Laurent Vivier <Laurent.Vivier@bull.net>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [RESEND 2][PATCH 4/4] Modify KVM to update guest time accounting.
Date: Mon, 15 Oct 2007 13:33:20 +0200 [thread overview]
Message-ID: <200710151333.21078.borntraeger@de.ibm.com> (raw)
In-Reply-To: <47134BCE.1080306@qumranet.com>
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
next prev parent reply other threads:[~2007-10-15 11:33 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-10 14:13 [RESEND 2][PATCH 4/4] Modify KVM to update guest time accounting Laurent Vivier
2007-10-15 9:38 ` Ingo Molnar
2007-10-15 9:47 ` Avi Kivity
2007-10-15 9:50 ` Ingo Molnar
2007-10-15 9:51 ` Ingo Molnar
2007-10-15 10:02 ` Avi Kivity
2007-10-15 10:53 ` Laurent Vivier
2007-10-15 11:15 ` Avi Kivity
2007-10-15 11:33 ` Christian Borntraeger [this message]
2007-10-15 11:38 ` Laurent Vivier
2007-10-15 14:39 ` Christian Borntraeger
2007-10-15 14:45 ` Laurent Vivier
2007-10-15 11:37 ` Laurent Vivier
2007-10-15 12:07 ` Avi Kivity
2007-10-15 12:29 ` Laurent Vivier
2007-10-15 16:46 ` Avi Kivity
2007-10-15 19:45 ` Laurent Vivier
2007-10-17 13:08 ` [PATCH] clear PF_VCPU in kvm_guest_exit() Laurent Vivier
2007-10-17 13:18 ` Christian Borntraeger
2007-10-17 14:16 ` Avi Kivity
2007-10-17 15:09 ` Laurent Vivier
2007-10-18 12:39 ` Use virtual cpu accounting if available for guest times Christian Borntraeger
2007-10-18 12:39 ` Christian Borntraeger
2007-10-18 12:41 ` Avi Kivity
2007-10-18 12:41 ` Avi Kivity
2007-10-19 16:57 ` [kvm-devel] " Hollis Blanchard
2007-10-19 17:18 ` Hollis Blanchard
2007-10-19 17:18 ` Hollis Blanchard
2007-10-18 13:19 ` [PATCH] move kvm_guest_exit() after local_irq_enable() Laurent Vivier
2007-10-18 13:32 ` [kvm-devel] " Avi Kivity
2007-10-18 13:32 ` Avi Kivity
2007-10-18 13:49 ` [kvm-devel] " Laurent Vivier
2007-10-22 8:26 ` Ingo Molnar
2007-10-22 8:26 ` Ingo Molnar
2007-10-22 8:51 ` Avi Kivity
2007-10-22 8:51 ` Avi Kivity
2007-10-22 8:57 ` Ingo Molnar
2007-10-22 8:57 ` Ingo Molnar
2007-10-22 9:10 ` [kvm-devel] " Avi Kivity
2007-10-22 9:10 ` Avi Kivity
2007-10-15 11:19 ` [RESEND 2][PATCH 4/4] Modify KVM to update guest time accounting Christian Borntraeger
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