git: ebc0d29e14f0 - stable/13 - amd64: remove lfence after swapgs on syscall entry
Konstantin Belousov
kib at FreeBSD.org
Thu Sep 2 00:53:02 UTC 2021
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
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