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authorAnthony Liguori <aliguori@us.ibm.com>2008-04-02 15:46:56 -0400
committerAvi Kivity <avi@qumranet.com>2008-04-27 05:01:15 -0400
commit35149e2129fe34fc8cb5917e1ecf5156b0fa3415 (patch)
treeb67cb16fa6054769ee476fce99a32601b126af10 /include/asm-x86
parentfdae862f91728aec6dd8fd62cd2398868c906b6b (diff)
KVM: MMU: Don't assume struct page for x86
This patch introduces a gfn_to_pfn() function and corresponding functions like kvm_release_pfn_dirty(). Using these new functions, we can modify the x86 MMU to no longer assume that it can always get a struct page for any given gfn. We don't want to eliminate gfn_to_page() entirely because a number of places assume they can do gfn_to_page() and then kmap() the results. When we support IO memory, gfn_to_page() will fail for IO pages although gfn_to_pfn() will succeed. This does not implement support for avoiding reference counting for reserved RAM or for IO memory. However, it should make those things pretty straight forward. Since we're only introducing new common symbols, I don't think it will break the non-x86 architectures but I haven't tested those. I've tested Intel, AMD, NPT, and hugetlbfs with Windows and Linux guests. [avi: fix overflow when shifting left pfns by adding casts] Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include/asm-x86')
-rw-r--r--include/asm-x86/kvm_host.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index b9230490d777..de3eccfb767c 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -248,8 +248,8 @@ struct kvm_vcpu_arch {
248 u64 *last_pte_updated; 248 u64 *last_pte_updated;
249 249
250 struct { 250 struct {
251 gfn_t gfn; /* presumed gfn during guest pte update */ 251 gfn_t gfn; /* presumed gfn during guest pte update */
252 struct page *page; /* page corresponding to that gfn */ 252 pfn_t pfn; /* pfn corresponding to that gfn */
253 int largepage; 253 int largepage;
254 } update_pte; 254 } update_pte;
255 255