From: Avi Kivity <avi@redhat.com>
To: "Roedel, Joerg" <Joerg.Roedel@amd.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] KVM: MMU: Use base_role.nxe for mmu.nx
Date: Thu, 16 Sep 2010 16:00:34 +0200 [thread overview]
Message-ID: <4C922302.20900@redhat.com> (raw)
In-Reply-To: <20100915084833.GH17759@amd.com>
On 09/15/2010 10:48 AM, Roedel, Joerg wrote:
> On Tue, Sep 14, 2010 at 06:08:37PM -0400, Marcelo Tosatti wrote:
> >
> > For tdp better set base_role.nxe to zero, otherwise duplicate tdp
> > pagetables can be created if the guest switches between nx/non-nx.
> >
>
> This does not work because bit 63 is marked as reserved if base_role.nxe
> is 0. If the walk_addr_generic function then runs with tdp enabled it
> would report a set nx bit as a rsvd fault.
> We also can't use is_nx() in those path because it does not distinguish
> between l1 and l2 nx. Are there guests that switch the efer.nx bit
> regularly enough so that it matters? If so I would suggest to drop this
> patch and keep mmu.nx.
>
>
I'll do that then. I'm still unhappy about the duplication.
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2010-09-16 14:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-14 15:46 [PATCH 0/2] NPT virtualization follow-up Joerg Roedel
2010-09-14 15:46 ` [PATCH 1/2] KVM: MMU: Don't track nested fault info in error-code Joerg Roedel
2010-09-16 14:01 ` Avi Kivity
2010-09-14 15:46 ` [PATCH 2/2] KVM: MMU: Use base_role.nxe for mmu.nx Joerg Roedel
2010-09-14 22:08 ` Marcelo Tosatti
2010-09-15 8:48 ` Roedel, Joerg
2010-09-15 14:48 ` Marcelo Tosatti
2010-09-16 14:00 ` Avi Kivity [this message]
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