[xen staging] xen/arm: mm: Re-implement setup_frame_table_mappings() with map_pages_to_xen()

[patchbot@xxxxxxx]

commit c9a707df83aad17a6fcf2e8330ab3b5bead6fb8b
Author:     Julien Grall <julien.grall@xxxxxxx>
AuthorDate: Sat Jun 11 12:27:41 2022 +0100
Commit:     Julien Grall <julien@xxxxxxx>
CommitDate: Sat Jun 11 12:29:06 2022 +0100

    xen/arm: mm: Re-implement setup_frame_table_mappings() with 
map_pages_to_xen()
    
    Now that map_pages_to_xen() has been extended to support 2MB mappings,
    we can replace the create_mappings() call by map_pages_to_xen() call.
    
    This has the advantage to remove the differences between 32-bit and
    64-bit code.
    
    Lastly remove create_mappings() as there is no more callers.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
    Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Tested-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/mm.c | 64 ++++++-------------------------------------------------
 1 file changed, 6 insertions(+), 58 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 65af44f422..be37176a47 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -369,40 +369,6 @@ void clear_fixmap(unsigned map)
     BUG_ON(res != 0);
 }
 
-/* Create Xen's mappings of memory.
- * Mapping_size must be either 2MB or 32MB.
- * Base and virt must be mapping_size aligned.
- * Size must be a multiple of mapping_size.
- * second must be a contiguous set of second level page tables
- * covering the region starting at virt_offset. */
-static void __init create_mappings(lpae_t *second,
-                                   unsigned long virt_offset,
-                                   unsigned long base_mfn,
-                                   unsigned long nr_mfns,
-                                   unsigned int mapping_size)
-{
-    unsigned long i, count;
-    const unsigned long granularity = mapping_size >> PAGE_SHIFT;
-    lpae_t pte, *p;
-
-    ASSERT((mapping_size == MB(2)) || (mapping_size == MB(32)));
-    ASSERT(!((virt_offset >> PAGE_SHIFT) % granularity));
-    ASSERT(!(base_mfn % granularity));
-    ASSERT(!(nr_mfns % granularity));
-
-    count = nr_mfns / XEN_PT_LPAE_ENTRIES;
-    p = second + second_linear_offset(virt_offset);
-    pte = mfn_to_xen_entry(_mfn(base_mfn), MT_NORMAL);
-    if ( granularity == 16 * XEN_PT_LPAE_ENTRIES )
-        pte.pt.contig = 1;  /* These maps are in 16-entry contiguous chunks. */
-    for ( i = 0; i < count; i++ )
-    {
-        write_pte(p + i, pte);
-        pte.pt.base += 1 << XEN_PT_LPAE_SHIFT;
-    }
-    flush_xen_tlb_local();
-}
-
 #ifdef CONFIG_DOMAIN_PAGE
 void *map_domain_page_global(mfn_t mfn)
 {
@@ -862,36 +828,18 @@ void __init setup_frametable_mappings(paddr_t ps, paddr_t 
pe)
     unsigned long frametable_size = nr_pdxs * sizeof(struct page_info);
     mfn_t base_mfn;
     const unsigned long mapping_size = frametable_size < MB(32) ? MB(2) : 
MB(32);
-#ifdef CONFIG_ARM_64
-    lpae_t *second, pte;
-    unsigned long nr_second;
-    mfn_t second_base;
-    int i;
-#endif
+    int rc;
 
     frametable_base_pdx = mfn_to_pdx(maddr_to_mfn(ps));
     /* Round up to 2M or 32M boundary, as appropriate. */
     frametable_size = ROUNDUP(frametable_size, mapping_size);
     base_mfn = alloc_boot_pages(frametable_size >> PAGE_SHIFT, 32<<(20-12));
 
-#ifdef CONFIG_ARM_64
-    /* Compute the number of second level pages. */
-    nr_second = ROUNDUP(frametable_size, FIRST_SIZE) >> FIRST_SHIFT;
-    second_base = alloc_boot_pages(nr_second, 1);
-    second = mfn_to_virt(second_base);
-    for ( i = 0; i < nr_second; i++ )
-    {
-        clear_page(mfn_to_virt(mfn_add(second_base, i)));
-        pte = mfn_to_xen_entry(mfn_add(second_base, i), MT_NORMAL);
-        pte.pt.table = 1;
-        write_pte(&xen_first[first_table_offset(FRAMETABLE_VIRT_START)+i], 
pte);
-    }
-    create_mappings(second, 0, mfn_x(base_mfn), frametable_size >> PAGE_SHIFT,
-                    mapping_size);
-#else
-    create_mappings(xen_second, FRAMETABLE_VIRT_START, mfn_x(base_mfn),
-                    frametable_size >> PAGE_SHIFT, mapping_size);
-#endif
+    rc = map_pages_to_xen(FRAMETABLE_VIRT_START, base_mfn,
+                          frametable_size >> PAGE_SHIFT,
+                          PAGE_HYPERVISOR_RW | _PAGE_BLOCK);
+    if ( rc )
+        panic("Unable to setup the frametable mappings.\n");
 
     memset(&frame_table[0], 0, nr_pdxs * sizeof(struct page_info));
     memset(&frame_table[nr_pdxs], -1,
--
generated by git-patchbot for /home/xen/git/xen.git#staging