From: Marcelo Tosatti <mtosatti@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>, kvm@vger.kernel.org
Subject: Re: [PATCH] KVM: MMU: Do not unconditionally read PDPTE from guest memory
Date: Fri, 5 Aug 2011 12:14:23 -0300 [thread overview]
Message-ID: <20110805151423.GA16953@amt.cnet> (raw)
In-Reply-To: <1311842177-9542-1-git-send-email-avi@redhat.com>
On Thu, Jul 28, 2011 at 11:36:17AM +0300, Avi Kivity wrote:
> Architecturally, PDPTEs are cached in the PDPTRs when CR3 is reloaded.
> On SVM, it is not possible to implement this, but on VMX this is possible
> and was indeed implemented until nested SVM changed this to unconditionally
> read PDPTEs dynamically. This has noticable impact when running PAE guests.
>
> Fix by changing the MMU to read PDPTRs from the cache, falling back to
> reading from memory for the nested MMU.
>
> Signed-off-by: Avi Kivity <avi@redhat.com>
Applied, thanks.
prev parent reply other threads:[~2011-08-05 15:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-28 8:36 [PATCH] KVM: MMU: Do not unconditionally read PDPTE from guest memory Avi Kivity
2011-07-29 11:31 ` Roedel, Joerg
2011-07-31 8:08 ` Avi Kivity
2011-08-02 9:31 ` Roedel, Joerg
2011-08-02 12:34 ` Avi Kivity
2011-08-02 13:11 ` Roedel, Joerg
2011-08-04 9:49 ` Roedel, Joerg
2011-08-05 15:14 ` Marcelo Tosatti [this message]
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