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xen.27494
xsa402-1.patch
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File xsa402-1.patch of Package xen.27494
From: Andrew Cooper <andrew.cooper3@citrix.com> Subject: 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@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- a/xen/include/asm-x86/page.h +++ b/xen/include/asm-x86/page.h @@ -320,6 +320,14 @@ void efi_update_l4_pgtable(unsigned int #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 @@ -338,8 +346,8 @@ void efi_update_l4_pgtable(unsigned int #define __PAGE_HYPERVISOR_RX (_PAGE_PRESENT | _PAGE_ACCESSED) #define __PAGE_HYPERVISOR (__PAGE_HYPERVISOR_RX | \ _PAGE_DIRTY | _PAGE_RW) -#define __PAGE_HYPERVISOR_UCMINUS (__PAGE_HYPERVISOR | _PAGE_PCD) -#define __PAGE_HYPERVISOR_UC (__PAGE_HYPERVISOR | _PAGE_PCD | _PAGE_PWT) +#define __PAGE_HYPERVISOR_UCMINUS (__PAGE_HYPERVISOR | _PAGE_UCM) +#define __PAGE_HYPERVISOR_UC (__PAGE_HYPERVISOR | _PAGE_UC) #define MAP_SMALL_PAGES _PAGE_AVAIL0 /* don't use superpages mappings */
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