[PATCH 24 of 34] kvm mmu transparent hugepage support

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From: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

This should work for both hugetlbfs and transparent hugepages.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -470,6 +470,15 @@ static int host_mapping_level(struct kvm
 
 	page_size = kvm_host_page_size(kvm, gfn);
 
+	/* check for transparent hugepages */
+	if (page_size == PAGE_SIZE) {
+		struct page *page = gfn_to_page(kvm, gfn);
+
+		if (!is_error_page(page) && PageTransCompound(page))
+			page_size = KVM_HPAGE_SIZE(2);
+		kvm_release_page_clean(page);
+	}
+
 	for (i = PT_PAGE_TABLE_LEVEL;
 	     i < (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES); ++i) {
 		if (page_size >= KVM_HPAGE_SIZE(i))

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