linux-kernel - [PATCH v3 07/12] x86/traps: Consolidate user fixups in exc_general

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Date:   Fri,  9 Jun 2023 21:36:27 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ravi Shankar <ravi.v.shankar@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Sohil Mehta <sohil.mehta@...el.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH v3 07/12] x86/traps: Consolidate user fixups in exc_general_protection()

From: Sohil Mehta <sohil.mehta@...el.com>

Move the UMIP exception fixup along with the other user mode fixups.

No functional change intended.

Suggested-by: Dave Hansen <dave.hansen@...el.com>
Signed-off-by: Sohil Mehta <sohil.mehta@...el.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 arch/x86/kernel/traps.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 58b1f208eff5..f3e619ce9fbd 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -736,11 +736,6 @@ DEFINE_IDTENTRY_ERRORCODE(exc_general_protection)
 
 	cond_local_irq_enable(regs);
 
-	if (static_cpu_has(X86_FEATURE_UMIP)) {
-		if (user_mode(regs) && fixup_umip_exception(regs))
-			goto exit;
-	}
-
 	if (v8086_mode(regs)) {
 		local_irq_enable();
 		handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code);
@@ -755,6 +750,9 @@ DEFINE_IDTENTRY_ERRORCODE(exc_general_protection)
 		if (fixup_vdso_exception(regs, X86_TRAP_GP, error_code, 0))
 			goto exit;
 
+		if (cpu_feature_enabled(X86_FEATURE_UMIP) && fixup_umip_exception(regs))
+			goto exit;
+
 		gp_user_force_sig_segv(regs, X86_TRAP_GP, error_code, desc);
 		goto exit;
 	}
-- 
2.39.2