linux-kernel - [PATCH v2 1/2] x86/mm: expose lookup

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Date:   Tue, 31 Oct 2017 19:48:39 +0800
From:   Haozhong Zhang <haozhong.zhang@...el.com>
To:     kvm@...r.kernel.org, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        rkrcmar@...hat.com, Xiao Guangrong <xiaoguangrong.eric@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        ivan.d.cuevas.escareno@...el.com, karthik.kumar@...el.com,
        Haozhong Zhang <haozhong.zhang@...el.com>
Subject: [PATCH v2 1/2] x86/mm: expose lookup_memtype()

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

Signed-off-by: Haozhong Zhang <haozhong.zhang@...el.com>
---
 arch/x86/include/asm/pat.h | 2 ++
 arch/x86/mm/pat.c          | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

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
-- 
2.14.1