From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Mon, 24 Feb 2014 16:59:32 +0000 (-0300)
Subject: KVM: MMU: drop read-only large sptes when creating lower level sptes
X-Git-Tag: v3.14-rc5~14^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=404381c5839d67aa0c275ad1da96ef3d3928ca2c;p=pandora-kernel.git

KVM: MMU: drop read-only large sptes when creating lower level sptes

Read-only large sptes can be created due to read-only faults as
follows:

- QEMU pagetable entry that maps guest memory is read-only
due to COW.
- Guest read faults such memory, COW is not broken, because
it is a read-only fault.
- Enable dirty logging, large spte not nuked because it is read-only.
- Write-fault on such memory causes guest to loop endlessly
(which must go down to level 1 because dirty logging is enabled).

Fix by dropping large spte when necessary.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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