[xen master] efi: avoid hard-coding the various PAT constants

[patchbot@xxxxxxx]

commit 32b61bcafccc1f12b7e98d2d2e3cef763ac1fb60
Author:     Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Thu Dec 15 17:04:40 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Dec 15 17:04:40 2022 +0100

    efi: avoid hard-coding the various PAT constants
    
    This makes the code much easier to understand, and avoids problems if
    Xen's PAT ever changes in the future.
    
    Signed-off-by: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/efi/boot.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index d3c6b055ae..b69c83e354 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -1724,23 +1724,23 @@ void __init efi_init_memory(void)
         emfn = PFN_UP(desc->PhysicalStart + len);
 
         if ( desc->Attribute & EFI_MEMORY_WB )
-            /* nothing */;
+            prot |= _PAGE_WB;
         else if ( desc->Attribute & EFI_MEMORY_WT )
-            prot |= _PAGE_PWT | MAP_SMALL_PAGES;
+            prot |= _PAGE_WT | MAP_SMALL_PAGES;
         else if ( desc->Attribute & EFI_MEMORY_WC )
-            prot |= _PAGE_PAT | MAP_SMALL_PAGES;
+            prot |= _PAGE_WC | MAP_SMALL_PAGES;
         else if ( desc->Attribute & (EFI_MEMORY_UC | EFI_MEMORY_UCE) )
-            prot |= _PAGE_PWT | _PAGE_PCD | MAP_SMALL_PAGES;
+            prot |= _PAGE_UC | MAP_SMALL_PAGES;
         else if ( efi_bs_revision >= EFI_REVISION(2, 5) &&
                   (desc->Attribute & EFI_MEMORY_WP) )
-            prot |= _PAGE_PAT | _PAGE_PWT | MAP_SMALL_PAGES;
+            prot |= _PAGE_WP | MAP_SMALL_PAGES;
         else
         {
             printk(XENLOG_ERR "Unknown cachability for MFNs %#lx-%#lx%s\n",
                    smfn, emfn - 1, efi_map_uc ? ", assuming UC" : "");
             if ( !efi_map_uc )
                 continue;
-            prot |= _PAGE_PWT | _PAGE_PCD | MAP_SMALL_PAGES;
+            prot |= _PAGE_UC | MAP_SMALL_PAGES;
         }
 
         if ( desc->Attribute & (efi_bs_revision < EFI_REVISION(2, 5)
--
generated by git-patchbot for /home/xen/git/xen.git#master