From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Wed, 30 Jun 2010 08:02:45 +0000 (+0800)
Subject: KVM: MMU: fix conflict access permissions in direct sp
X-Git-Tag: v2.6.36-rc1~580^2~49
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5fd5387c89ec99ff6cb82d2477ffeb7211b781c2;p=karo-tx-linux.git

KVM: MMU: fix conflict access permissions in direct sp

In no-direct mapping, we mark sp is 'direct' when we mapping the
guest's larger page, but its access is encoded form upper page-struct
entire not include the last mapping, it will cause access conflict.

For example, have this mapping:
        [W]
      / PDE1 -> |---|
  P[W]          |   | LPA
      \ PDE2 -> |---|
        [R]

P have two children, PDE1 and PDE2, both PDE1 and PDE2 mapping the
same lage page(LPA). The P's access is WR, PDE1's access is WR,
PDE2's access is RO(just consider read-write permissions here)

When guest access PDE1, we will create a direct sp for LPA, the sp's
access is from P, is W, then we will mark the ptes is W in this sp.

Then, guest access PDE2, we will find LPA's shadow page, is the same as
PDE's, and mark the ptes is RO.

So, if guest access PDE1, the incorrect #PF is occured.

Fixed by encode the last mapping access into direct shadow page

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index a21a86ef9e20..f4e4aaa65ff3 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -339,6 +339,8 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 			direct = 1;
 			if (!is_dirty_gpte(gw->ptes[level - delta]))
 				access &= ~ACC_WRITE_MASK;
+			access &= gw->pte_access;
+
 			/*
 			 * It is a large guest pages backed by small host pages,
 			 * So we set @direct(@sp->role.direct)=1, and set