git: 678bc2281c37 - main - la57: do not set global bit for PML5 entry

From: Konstantin Belousov <kib_at_FreeBSD.org>
Date: Mon, 16 Sep 2024 08:15:11 UTC
The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=678bc2281c3727e920604545240d9115de3d1bd3

commit 678bc2281c3727e920604545240d9115de3d1bd3
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2024-09-14 17:15:51 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2024-09-16 08:13:51 +0000

    la57: do not set global bit for PML5 entry
    
    The bit is reserved for PLM5, causing #PF on KVA access on real
    hardware, unlike QEMU.
    
    Sponsored by:   Advanced Micro Devices (AMD)
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
---
 sys/amd64/amd64/pmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index b513c0c9c957..eadcb726b6c2 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -2226,7 +2226,7 @@ pmap_bootstrap_la57(void *arg __unused)
 	 * entering all existing kernel mappings into level 5 table.
 	 */
 	v_pml5[pmap_pml5e_index(UPT_MAX_ADDRESS)] = KPML4phys | X86_PG_V |
-	    X86_PG_RW | X86_PG_A | X86_PG_M | pg_g;
+	    X86_PG_RW | X86_PG_A | X86_PG_M;
 
 	/*
 	 * Add pml5 entry for 1:1 trampoline mapping after LA57 is turned on.