linux-kernel - [PATCH 10/47] KVM: MMU: make for_each_shadow

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Date:	Wed, 19 Aug 2009 16:02:06 +0300
From:	Avi Kivity <avi@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 10/47] KVM: MMU: make for_each_shadow_entry aware of largepages

From: Marcelo Tosatti <mtosatti@...hat.com>

This way there is no need to add explicit checks in every
for_each_shadow_entry user.

Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
---
 arch/x86/kvm/mmu.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 780ce3f..e18f65b 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1302,6 +1302,11 @@ static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator)
 {
 	if (iterator->level < PT_PAGE_TABLE_LEVEL)
 		return false;
+
+	if (iterator->level == PT_PAGE_TABLE_LEVEL)
+		if (is_large_pte(*iterator->sptep))
+			return false;
+
 	iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level);
 	iterator->sptep	= ((u64 *)__va(iterator->shadow_addr)) + iterator->index;
 	return true;
-- 
1.6.3.3

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