[PATCH v2 5/6] x86/entry/32: Remove SEP test for SYSEXIT

From: Brian Gerst
Date: Fri Jul 21 2023 - 12:11:14 EST


SEP must be already be present in order for do_fast_syscall_32() to be
called on native 32-bit, so checking it again is unnecessary.

Signed-off-by: Brian Gerst <brgerst@xxxxxxxxx>
---
arch/x86/entry/common.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 5b3594457af3..4d7d6d25dda9 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -265,8 +265,7 @@ __visible noinstr bool do_fast_syscall_32(struct pt_regs *regs)
* We don't allow syscalls at all from VM86 mode, but we still
* need to check VM, because we might be returning from sys_vm86.
*/
- return static_cpu_has(X86_FEATURE_SEP) &&
- regs->cs == __USER_CS && regs->ss == __USER_DS &&
+ return regs->cs == __USER_CS && regs->ss == __USER_DS &&
regs->ip == landing_pad &&
(regs->flags & (X86_EFLAGS_RF | X86_EFLAGS_TF | X86_EFLAGS_VM)) == 0;
#endif
--
2.41.0