git: c9c7058c319b - stable/14 - amd64: set PCB_TLSBASE pcb flag only for new C runtime threads

[Konstantin Belousov]

The branch stable/14 has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=c9c7058c319beaaef7538833d8d3f464f71885ad

commit c9c7058c319beaaef7538833d8d3f464f71885ad
Author:     Konstantin Belousov <k...@freebsd.org>
AuthorDate: 2025-05-30 11:25:50 +0000
Commit:     Konstantin Belousov <k...@freebsd.org>
CommitDate: 2025-06-12 18:02:51 +0000

    amd64: set PCB_TLSBASE pcb flag only for new C runtime threads
    
    (cherry picked from commit 16ce7f1a3603fce5262cf0656a01c4177c75fa50)
---
 sys/amd64/amd64/vm_machdep.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c
index e069df9a375f..1739c2b57afd 100644
--- a/sys/amd64/amd64/vm_machdep.c
+++ b/sys/amd64/amd64/vm_machdep.c
@@ -62,6 +62,7 @@
 #include <sys/smp.h>
 #include <sys/sysctl.h>
 #include <sys/sysent.h>
+#include <sys/thr.h>
 #include <sys/unistd.h>
 #include <sys/vnode.h>
 #include <sys/vmmeter.h>
@@ -166,6 +167,7 @@ copy_thread(struct thread *td1, struct thread *td2)
                MPASS((pcb2->pcb_flags & (PCB_KERNFPU | PCB_KERNFPU_THR)) == 0);
                bcopy(get_pcb_user_save_td(td1), get_pcb_user_save_pcb(pcb2),
                    cpu_max_ext_state_size);
+               clear_pcb_flags(pcb2, PCB_TLSBASE);
        }
 
        td2->td_frame = (struct trapframe *)td2->td_md.md_stack_base - 1;
@@ -675,7 +677,8 @@ cpu_set_user_tls(struct thread *td, void *tls_base, int 
thr_flags)
                return (EINVAL);
 
        pcb = td->td_pcb;
-       set_pcb_flags(pcb, PCB_FULL_IRET | PCB_TLSBASE);
+       set_pcb_flags(pcb, PCB_FULL_IRET | ((thr_flags &
+           THR_C_RUNTIME) != 0 ? PCB_TLSBASE : 0));
 #ifdef COMPAT_FREEBSD32
        if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
                pcb->pcb_gsbase = (register_t)tls_base;