From: Anthony Liguori <anthony@codemonkey.ws>
To: Lok Kwong Yan <loyan@syr.edu>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: Does KVM use one EPT table per Guest CR3?
Date: Tue, 07 Dec 2010 15:57:20 -0600 [thread overview]
Message-ID: <4CFEADC0.9030002@codemonkey.ws> (raw)
In-Reply-To: <562744ED4DABB345A26E01CB5D34F5103192CFFE@BL2PRD0103MB033.prod.exchangelabs.com>
On 12/07/2010 03:47 PM, Lok Kwong Yan wrote:
> After some testing and digging around the 2.6.32-26 Kernel, Ubuntu port, , it seems to me that KVM creates a separate EPT table for each separate guest CR3 value. So, if there are 100 guest processes, there are essentially 100 EPT tables. Is this correct?
No, it's not correct.
Regards,
Anthony Liguori
> If so, can someone please tell me where these tables are actually being created? Is this design decision a historical artifact from how QEMU/KVM (without EPT/NPT) created multiple shadow page tables so that each guest/virtual CR3 value has a corresponding real CR3 value so that memory based separation for the guest is enforced?
>
> Thanks!--
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next prev parent reply other threads:[~2010-12-07 21:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-07 21:47 Does KVM use one EPT table per Guest CR3? Lok Kwong Yan
2010-12-07 21:57 ` Anthony Liguori [this message]
2010-12-07 22:00 ` Lok Kwong Yan
2010-12-07 22:11 ` Anthony Liguori
2010-12-10 7:44 ` Lok Kwong Yan
2010-12-12 10:47 ` Avi Kivity
2010-12-16 22:14 ` Lok Kwong Yan
2010-12-17 15:24 ` Avi Kivity
2010-12-19 14:31 ` Avi Kivity
2010-12-22 21:56 ` Lok Kwong Yan
2011-02-10 20:47 ` Lok Kwong Yan
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