[PATCH v1 2/3] xen/riscv: update defintion of vmap_to_mfn()

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

vmap_to_mfn() uses virt_to_maddr(), which is designed to work with VA from
either the direct map region or Xen's linkage region (XEN_VIRT_START).
An assertion will occur if it is used with other regions, in particular for
the VMAP region.

Since RISC-V lacks a hardware feature to request the MMU to translate a VA to
a PA (as Arm does, for example), software page table walking (pt_walk()) is
used for the VMAP region to obtain the PA.

Fixes: 7db8d2bd9b ("xen/riscv: add minimal stuff to mm.h to build full Xen")
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/riscv/include/asm/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/riscv/include/asm/mm.h b/xen/arch/riscv/include/asm/mm.h
index d46018c132..528e1e257f 100644
--- a/xen/arch/riscv/include/asm/mm.h
+++ b/xen/arch/riscv/include/asm/mm.h
@@ -25,7 +25,7 @@ paddr_t pt_walk(vaddr_t va);
 #define gaddr_to_gfn(ga)    _gfn(paddr_to_pfn(ga))
 #define mfn_to_maddr(mfn)   pfn_to_paddr(mfn_x(mfn))
 #define maddr_to_mfn(ma)    _mfn(paddr_to_pfn(ma))
-#define vmap_to_mfn(va)     maddr_to_mfn(virt_to_maddr((vaddr_t)(va)))
+#define vmap_to_mfn(va)     maddr_to_mfn(pt_walk((vaddr_t)(va)))
 #define vmap_to_page(va)    mfn_to_page(vmap_to_mfn(va))
 
 static inline void *maddr_to_virt(paddr_t ma)
-- 
2.48.1