git: 21fc6a2a10cf - main - amd64: invalidate TLB between page table update and access

[Konstantin Belousov]

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=21fc6a2a10cf6fbd294decbb0001473693ec1618

commit 21fc6a2a10cf6fbd294decbb0001473693ec1618
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-04-16 18:28:08 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-04-30 14:43:45 +0000

    amd64: invalidate TLB between page table update and access
    
    When setting up trampoline mapping for LA57 switcher, it is possible
    that TLB still has some random mapping at that address.
    
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
---
 sys/amd64/amd64/pmap.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index 66617bffa8df..5a6a1cee8b8c 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -2168,6 +2168,7 @@ pmap_bootstrap_la57(void *arg __unused)
 	*(u_long *)(v_code + 2 + (la57_trampoline_gdt_desc - la57_trampoline)) =
 	    la57_trampoline_gdt - la57_trampoline + VM_PAGE_TO_PHYS(m_code);
 	la57_tramp = (void (*)(uint64_t))VM_PAGE_TO_PHYS(m_code);
+	invlpg((vm_offset_t)la57_tramp);
 	la57_tramp(KPML5phys);
 
 	/*