[v2,1/2] x86/mm: expose lookup_memtype()

Commit Message

Haozhong Zhang Oct. 31, 2017, 11:48 a.m. UTC

KVM MMU will use it to get the cache mode of the host page.

Signed-off-by: Haozhong Zhang <[e-mail]>
---
 arch/x86/include/asm/pat.h | 2 ++
 arch/x86/mm/pat.c          | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

Patch

diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index fffb2794dd89..990d955972b8 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -21,4 +21,6 @@  int io_reserve_memtype(resource_size_t start, resource_size_t end,
 
 void io_free_memtype(resource_size_t start, resource_size_t end);
 
+enum page_cache_mode lookup_memtype(u64 paddr);
+
 #endif /* _ASM_X86_PAT_H */
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index fe7d57a8fb60..e85987aaf5d5 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -650,7 +650,7 @@  int free_memtype(u64 start, u64 end)
  * Returns _PAGE_CACHE_MODE_WB, _PAGE_CACHE_MODE_WC, _PAGE_CACHE_MODE_UC_MINUS
  * or _PAGE_CACHE_MODE_WT.
  */
-static enum page_cache_mode lookup_memtype(u64 paddr)
+enum page_cache_mode lookup_memtype(u64 paddr)
 {
 	enum page_cache_mode rettype = _PAGE_CACHE_MODE_WB;
 	struct memtype *entry;
@@ -676,6 +676,7 @@  static enum page_cache_mode lookup_memtype(u64 paddr)
 	spin_unlock(&memtype_lock);
 	return rettype;
 }
+EXPORT_SYMBOL_GPL(lookup_memtype);
 
 /**
  * io_reserve_memtype - Request a memory type mapping for a region of memory