[xen staging] x86/page: Introduce _PAGE_* constants for memory types

[patchbot@xxxxxxx]

commit 1be8707c75bf4ba68447c74e1618b521dd432499
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Jun 9 14:21:38 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jun 9 14:21:38 2022 +0200

    x86/page: Introduce _PAGE_* constants for memory types
    
    ... rather than opencoding the PAT/PCD/PWT attributes in __PAGE_HYPERVISOR_*
    constants.  These are going to be needed by forthcoming logic.
    
    No functional change.
    
    This is part of XSA-402.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/include/asm/page.h | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/include/asm/page.h b/xen/arch/x86/include/asm/page.h
index 447491cd09..b585235d06 100644
--- a/xen/arch/x86/include/asm/page.h
+++ b/xen/arch/x86/include/asm/page.h
@@ -331,6 +331,14 @@ void efi_update_l4_pgtable(unsigned int l4idx, 
l4_pgentry_t);
 
 #define PAGE_CACHE_ATTRS (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
 
+/* Memory types, encoded under Xen's choice of MSR_PAT. */
+#define _PAGE_WB         (                                0)
+#define _PAGE_WT         (                        _PAGE_PWT)
+#define _PAGE_UCM        (            _PAGE_PCD            )
+#define _PAGE_UC         (            _PAGE_PCD | _PAGE_PWT)
+#define _PAGE_WC         (_PAGE_PAT                        )
+#define _PAGE_WP         (_PAGE_PAT |             _PAGE_PWT)
+
 /*
  * Debug option: Ensure that granted mappings are not implicitly unmapped.
  * WARNING: This will need to be disabled to run OSes that use the spare PTE
@@ -349,10 +357,10 @@ void efi_update_l4_pgtable(unsigned int l4idx, 
l4_pgentry_t);
 #define __PAGE_HYPERVISOR_RX      (_PAGE_PRESENT | _PAGE_ACCESSED)
 #define __PAGE_HYPERVISOR         (__PAGE_HYPERVISOR_RX | \
                                    _PAGE_DIRTY | _PAGE_RW)
-#define __PAGE_HYPERVISOR_WT      (__PAGE_HYPERVISOR | _PAGE_PWT)
-#define __PAGE_HYPERVISOR_UCMINUS (__PAGE_HYPERVISOR | _PAGE_PCD)
-#define __PAGE_HYPERVISOR_UC      (__PAGE_HYPERVISOR | _PAGE_PCD | _PAGE_PWT)
-#define __PAGE_HYPERVISOR_WC      (__PAGE_HYPERVISOR | _PAGE_PAT)
+#define __PAGE_HYPERVISOR_WT      (__PAGE_HYPERVISOR | _PAGE_WT)
+#define __PAGE_HYPERVISOR_UCMINUS (__PAGE_HYPERVISOR | _PAGE_UCM)
+#define __PAGE_HYPERVISOR_UC      (__PAGE_HYPERVISOR | _PAGE_UC)
+#define __PAGE_HYPERVISOR_WC      (__PAGE_HYPERVISOR | _PAGE_WC)
 #define __PAGE_HYPERVISOR_SHSTK   (__PAGE_HYPERVISOR_RO | _PAGE_DIRTY)
 
 #define MAP_SMALL_PAGES _PAGE_AVAIL0 /* don't use superpages mappings */
--
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