[xen staging] arm: Fix PT_PT table descriptor value and comment

[patchbot@xxxxxxx]

commit eb372d90624124e2ab6b05561fbbfe8b54cc0d26
Author:     Gabriel Quintáns Souto <gabi.qs.mail@xxxxxxxxx>
AuthorDate: Mon May 18 23:00:08 2026 +0200
Commit:     Michal Orzel <michal.orzel@xxxxxxx>
CommitDate: Mon Aug 3 11:48:59 2026 +0200

    arm: Fix PT_PT table descriptor value and comment
    
    Per ARMv7-A/ARMv8-A ARM, bits [11:2] of table descriptors are
    ignored by hardware. The original comment incorrectly described
    block/page descriptor fields which are not present in table
    descriptors.
    
    Use the minimal valid encoding for table descriptors by setting
    PT_PT to 0x3.
    
    This updates both arm32 and arm64 for consistency.
    
    Signed-off-by: Gabriel Quintáns Souto <gabi.qs.mail@xxxxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
    Reviewed-by: Julien Grall <julien@xxxxxxx>
---
 xen/arch/arm/arm32/mmu/head.S | 2 +-
 xen/arch/arm/arm64/mmu/head.S | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/arm32/mmu/head.S b/xen/arch/arm/arm32/mmu/head.S
index 5032e6c075..3731322f7e 100644
--- a/xen/arch/arm/arm32/mmu/head.S
+++ b/xen/arch/arm/arm32/mmu/head.S
@@ -8,7 +8,7 @@
 #include <asm/page.h>
 #include <asm/early_printk.h>
 
-#define PT_PT     0xf7f /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=1 P=1 */
+#define PT_PT     0x3   /* T=1 P=1 */
 #define PT_MEM    0xf7d /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=0 P=1 */
 #define PT_MEM_L3 0xf7f /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=1 P=1 */
 #define PT_DEV    0xe71 /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=100 T=0 P=1 */
diff --git a/xen/arch/arm/arm64/mmu/head.S b/xen/arch/arm/arm64/mmu/head.S
index d14780ad19..8e514d2114 100644
--- a/xen/arch/arm/arm64/mmu/head.S
+++ b/xen/arch/arm/arm64/mmu/head.S
@@ -8,7 +8,7 @@
 #include <asm/page.h>
 #include <asm/early_printk.h>
 
-#define PT_PT     0xf7f /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=1 P=1 */
+#define PT_PT     0x3   /* T=1 P=1 */
 #define PT_MEM    0xf7d /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=0 P=1 */
 #define PT_MEM_L3 0xf7f /* nG=1 AF=1 SH=11 AP=01 NS=1 ATTR=111 T=1 P=1 */
 #define PT_DEV    0xe71 /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=100 T=0 P=1 */
--
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