[PATCH -next] kvm: fix compilation errors with mem[re|un]map()

[Qian Cai <cai@xxxxxx>]

The linux-next commit e45adf665a53 ("KVM: Introduce a new guest mapping
API") introduced compilation errors on arm64.

arch/arm64/kvm/../../../virt/kvm/kvm_main.c:1764:9: error: implicit
declaration of function 'memremap'
[-Werror,-Wimplicit-function-declaration]
                hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB);
                      ^
arch/arm64/kvm/../../../virt/kvm/kvm_main.c:1764:9: error: this function
declaration is not a prototype [-Werror,-Wstrict-prototypes]
arch/arm64/kvm/../../../virt/kvm/kvm_main.c:1764:46: error: use of
undeclared identifier 'MEMREMAP_WB'
                hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB);
                                                           ^
arch/arm64/kvm/../../../virt/kvm/kvm_main.c:1796:3: error: implicit
declaration of function 'memunmap'
[-Werror,-Wimplicit-function-declaration]
                memunmap(map->hva);

Fixed it by including io.h in kvm_main.c.

Signed-off-by: Qian Cai <cai@xxxxxx>
---
 virt/kvm/kvm_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8d83a787fd6b..5c5102799c2c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -51,6 +51,7 @@
 #include <linux/slab.h>
 #include <linux/sort.h>
 #include <linux/bsearch.h>
+#include <linux/io.h>
 
 #include <asm/processor.h>
 #include <asm/io.h>
-- 
1.8.3.1