From: Avi Kivity <avi@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: sheng@linux.intel.com, kvm@vger.kernel.org
Subject: Re: [patch 0/4] mmu audit update
Date: Sun, 07 Jun 2009 10:14:03 +0300 [thread overview]
Message-ID: <4A2B68BB.4070507@redhat.com> (raw)
In-Reply-To: <20090602213655.640083007@localhost.localdomain>
Marcelo Tosatti wrote:
> Some updates to the MMU audit code.
>
> The third patch is "guessy" because I could not find the notrap spte
> documentation, all I can see is the page-fault error code mask and match
> fields in the VMCS, but can't see the link of that to sptes. Can someone
> point it out please?
>
When bypass_guest_pf is set, we tell vmx not to trap if the fault is due
to page-not-present. So if we know gpte.p == 0, we set spte.p = 0 and
allow not-present page faults to go directly to the guest without trapping.
Of course, we still need to trap cases where gpte.p = 1 but we haven't
mapped the page yet. So we set a reserved bit in the spte and trap on that.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2009-06-07 7:14 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-02 21:36 [patch 0/4] mmu audit update Marcelo Tosatti
2009-06-02 21:36 ` [patch 1/4] KVM: MMU audit: update count_writable_mappings / count_rmaps Marcelo Tosatti
2009-06-08 9:24 ` Avi Kivity
2009-06-09 12:33 ` Marcelo Tosatti
2009-06-09 12:40 ` Avi Kivity
2009-06-02 21:36 ` [patch 2/4] KVM: MMU audit: update audit_write_protection Marcelo Tosatti
2009-06-02 21:36 ` [patch 3/4] KVM: MMU audit: nontrapping ptes in nonleaf level Marcelo Tosatti
2009-06-02 21:36 ` [patch 4/4] KVM: MMU audit: audit_mappings tweaks Marcelo Tosatti
2009-06-08 9:29 ` Avi Kivity
2009-06-07 7:14 ` Avi Kivity [this message]
2009-06-10 15:27 ` [patch 0/6] mmu audit update v4 Marcelo Tosatti
2009-06-10 15:27 ` [patch 1/6] KVM: MMU: introduce is_last_spte helper Marcelo Tosatti
2009-06-10 15:27 ` [patch 2/6] KVM: MMU audit: update count_writable_mappings / count_rmaps Marcelo Tosatti
2009-06-10 15:27 ` [patch 3/6] KVM: MMU audit: update audit_write_protection Marcelo Tosatti
2009-06-10 15:27 ` [patch 4/6] KVM: MMU audit: nontrapping ptes in nonleaf level Marcelo Tosatti
2009-06-10 15:27 ` [patch 5/6] KVM: MMU audit: audit_mappings tweaks Marcelo Tosatti
2009-06-10 15:27 ` [patch 6/6] KVM: MMU audit: largepage handling Marcelo Tosatti
2009-06-11 14:24 ` [patch 0/6] mmu audit update v4 Avi Kivity
2009-06-09 13:13 ` [patch 0/4] mmu audit update v2 Marcelo Tosatti
2009-06-09 13:13 ` [patch 1/4] KVM: MMU audit: update count_writable_mappings / count_rmaps Marcelo Tosatti
2009-06-09 13:13 ` [patch 2/4] KVM: MMU audit: update audit_write_protection Marcelo Tosatti
2009-06-09 13:13 ` [patch 3/4] KVM: MMU audit: nontrapping ptes in nonleaf level Marcelo Tosatti
2009-06-09 13:13 ` [patch 4/4] KVM: MMU audit: audit_mappings tweaks Marcelo Tosatti
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