4.9-stable patches

[thirdparty/kernel/stable-queue.git] / queue-4.9 / 0005-x86-bugs-Switch-the-selection-of-mitigation-from-CPU.patch

From 8bd6a7e35d130a16394561aaf443fcdc07bf22ca Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Fri, 1 Jun 2018 10:59:21 -0400
Subject: [PATCH 05/76] x86/bugs: Switch the selection of mitigation from CPU
 vendor to CPU features

commit 108fab4b5c8f12064ef86e02cb0459992affb30f upstream.

Both AMD and Intel can have SPEC_CTRL_MSR for SSBD.

However AMD also has two more other ways of doing it - which
are !SPEC_CTRL MSR ways.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: kvm@vger.kernel.org
Cc: KarimAllah Ahmed <karahmed@amazon.de>
Cc: andrew.cooper3@citrix.com
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lkml.kernel.org/r/20180601145921.9500-4-konrad.wilk@oracle.com
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/kernel/cpu/bugs.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index b1146405ce8a..878832580f7f 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -534,17 +534,12 @@ static enum ssb_mitigation __init __ssb_select_mitigation(void)
 		 * Intel uses the SPEC CTRL MSR Bit(2) for this, while AMD may
 		 * use a completely different MSR and bit dependent on family.
 		 */
-		switch (boot_cpu_data.x86_vendor) {
-		case X86_VENDOR_INTEL:
-		case X86_VENDOR_AMD:
-			if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) {
-				x86_amd_ssb_disable();
-				break;
-			}
+		if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL))
+			x86_amd_ssb_disable();
+		else {
 			x86_spec_ctrl_base |= SPEC_CTRL_SSBD;
 			x86_spec_ctrl_mask |= SPEC_CTRL_SSBD;
 			wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base);
-			break;
 		}
 	}
 
-- 
2.21.0