From: Yulei Zhang <yuleixzhang@xxxxxxxxxxx>
Dmem page is pfn invalid but not mmio, introduce API
is_dmem_pfn() to distinguish that.
Signed-off-by: Chen Zhuo <sagazchen@xxxxxxxxxxx>
Signed-off-by: Yulei Zhang <yuleixzhang@xxxxxxxxxxx>
---
arch/x86/kvm/mmu/mmu.c | 1 +
include/linux/dmem.h | 7 +++++++
mm/dmem.c | 7 +++++++
3 files changed, 15 insertions(+)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 5bb1939..394508f 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -43,6 +43,7 @@
#include <linux/hash.h>
#include <linux/kern_levels.h>
#include <linux/kthread.h>
+#include <linux/dmem.h>
#include <asm/page.h>
#include <asm/memtype.h>
diff --git a/include/linux/dmem.h b/include/linux/dmem.h
index 8682d63..59d3ef14 100644
--- a/include/linux/dmem.h
+++ b/include/linux/dmem.h
@@ -19,11 +19,18 @@
unsigned int try_max, unsigned int *result_nr);
void dmem_free_pages(phys_addr_t addr, unsigned int dpages_nr);
+bool is_dmem_pfn(unsigned long pfn);
#define dmem_free_page(addr) dmem_free_pages(addr, 1)
#else
static inline int dmem_reserve_init(void)
{
return 0;
}
+
+static inline bool is_dmem_pfn(unsigned long pfn)
+{
+ return 0;
+}
+
#endif
#endif /* _LINUX_DMEM_H */
diff --git a/mm/dmem.c b/mm/dmem.c
index 2e61dbd..eb6df70 100644
--- a/mm/dmem.c
+++ b/mm/dmem.c
@@ -972,3 +972,10 @@ void dmem_free_pages(phys_addr_t addr, unsigned int dpages_nr)
}
EXPORT_SYMBOL(dmem_free_pages);
+bool is_dmem_pfn(unsigned long pfn)
+{
+ struct dmem_node *dnode;
+
+ return !!find_dmem_region(__pfn_to_phys(pfn), &dnode);
+}
+EXPORT_SYMBOL(is_dmem_pfn);
--
1.8.3.1
