git: ebc0d29e14f0 - stable/13 - amd64: remove lfence after swapgs on syscall entry

[Konstantin Belousov]

The branch stable/13 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=ebc0d29e14f08b76908ed872815ffe3d01df9a79

commit ebc0d29e14f08b76908ed872815ffe3d01df9a79
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-08-25 19:28:57 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-09-02 00:52:24 +0000

    amd64: remove lfence after swapgs on syscall entry
    
    (cherry picked from commit 7aa47cace14948a7b8277a4b24a0ca9e0308990a)
---
 sys/amd64/amd64/exception.S | 2 --
 1 file changed, 2 deletions(-)

diff --git a/sys/amd64/amd64/exception.S b/sys/amd64/amd64/exception.S
index 3fb518179406..bd9f235626eb 100644
--- a/sys/amd64/amd64/exception.S
+++ b/sys/amd64/amd64/exception.S
@@ -525,7 +525,6 @@ prot_addrf:
 	SUPERALIGN_TEXT
 IDTVEC(fast_syscall_pti)
 	swapgs
-	lfence
 	cmpq	$~0,PCPU(UCR3)
 	je	fast_syscall_common
 	movq	%rax,PCPU(SCRATCH_RAX)
@@ -536,7 +535,6 @@ IDTVEC(fast_syscall_pti)
 	SUPERALIGN_TEXT
 IDTVEC(fast_syscall)
 	swapgs
-	lfence
 fast_syscall_common:
 	movq	%rsp,PCPU(SCRATCH_RSP)
 	movq	PCPU(RSP0),%rsp