diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 37cb5aad71de..c5d30cab7d6f 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2021,6 +2021,9 @@ static unsigned long __init xen_read_phys_ulong(phys_addr_t addr)
 	return val;
 }
 
+static char debug_buf[100];
+#define xen_debug_pr(...) sprintf(debug_buf, __VA_ARGS__); xen_raw_console_write(debug_buf)
+
 /*
  * Translate a virtual address to a physical one without relying on mapped
  * page tables.
@@ -2034,14 +2037,17 @@ static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
 	pte_t pte;
 
 	pa = read_cr3();
+xen_debug_pr("%s: vaddr=%lx, cr3=%lx\n", __func__, vaddr, (unsigned long)pa);
 	pgd = native_make_pgd(xen_read_phys_ulong(pa + pgd_index(vaddr) *
 						       sizeof(pgd)));
+xen_debug_pr("%s: pgd=%lx\n", __func__, pgd.pgd);
 	if (!pgd_present(pgd))
 		return 0;
 
 	pa = pgd_val(pgd) & PTE_PFN_MASK;
 	pud = native_make_pud(xen_read_phys_ulong(pa + pud_index(vaddr) *
 						       sizeof(pud)));
+xen_debug_pr("%s: pa=%lx, pud=%lx\n", __func__, (unsigned long)pa, pud.pud);
 	if (!pud_present(pud))
 		return 0;
 	pa = pud_pfn(pud) << PAGE_SHIFT;
@@ -2050,6 +2056,7 @@ static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
 
 	pmd = native_make_pmd(xen_read_phys_ulong(pa + pmd_index(vaddr) *
 						       sizeof(pmd)));
+xen_debug_pr("%s: pa=%lx, pmd=%lx\n", __func__, (unsigned long)pa, pmd.pmd);
 	if (!pmd_present(pmd))
 		return 0;
 	pa = pmd_pfn(pmd) << PAGE_SHIFT;
@@ -2058,9 +2065,11 @@ static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
 
 	pte = native_make_pte(xen_read_phys_ulong(pa + pte_index(vaddr) *
 						       sizeof(pte)));
+xen_debug_pr("%s: pa=%lx, pte=%lx\n", __func__, (unsigned long)pa, pte.pte);
 	if (!pte_present(pte))
 		return 0;
 	pa = pte_pfn(pte) << PAGE_SHIFT;
+xen_debug_pr("%s: pa=%lx\n", __func__, (unsigned long)pa);
 
 	return pa | (vaddr & ~PAGE_MASK);
 }