[PATCH 4.4.y 047/101] x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist
STALE2981d
REVIEWED: 3 (0M)
From: Srivatsa S. Bhat <hidden>
Date: 2018-07-14 09:51:26
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
3 review trailers.
Possibly related (same subject, not in this thread)
- 2018-07-13 · [PATCH 4.4.y 047/101] x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist · Srivatsa S. Bhat <hidden>
From: Alexander Sergeyev <redacted> commit e3b3121fa8da94cb20f9e0c64ab7981ae47fd085 upstream. In accordance with Intel's microcode revision guidance from March 6 MCU rev 0xc2 is cleared on both Skylake H/S and Skylake Xeon E3 processors that share CPUID 506E3. Signed-off-by: Alexander Sergeyev <redacted> Signed-off-by: Thomas Gleixner <redacted> Cc: Jia Zhang <redacted> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Kyle Huey <redacted> Cc: David Woodhouse <redacted> Link: https://lkml.kernel.org/r/20180313193856.GA8580@localhost.localdomain Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Srivatsa S. Bhat <redacted> Reviewed-by: Matt Helsley (VMware) <redacted> Reviewed-by: Alexey Makhalov <redacted> Reviewed-by: Bo Gan <redacted> --- arch/x86/kernel/cpu/intel.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index dcc0349..77d9f68 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c@@ -29,7 +29,7 @@ /* * Early microcode releases for the Spectre v2 mitigation were broken. * Information taken from; - * - https://newsroom.intel.com/wp-content/uploads/sites/11/2018/01/microcode-update-guidance.pdf + * - https://newsroom.intel.com/wp-content/uploads/sites/11/2018/03/microcode-update-guidance.pdf * - https://kb.vmware.com/s/article/52345 * - Microcode revisions observed in the wild * - Release note from 20180108 microcode release
@@ -47,7 +47,6 @@ static const struct sku_microcode spectre_bad_microcodes[] = { { INTEL_FAM6_KABYLAKE_MOBILE, 0x09, 0x80 }, { INTEL_FAM6_SKYLAKE_X, 0x03, 0x0100013e }, { INTEL_FAM6_SKYLAKE_X, 0x04, 0x0200003c }, - { INTEL_FAM6_SKYLAKE_DESKTOP, 0x03, 0xc2 }, { INTEL_FAM6_BROADWELL_CORE, 0x04, 0x28 }, { INTEL_FAM6_BROADWELL_GT3E, 0x01, 0x1b }, { INTEL_FAM6_BROADWELL_XEON_D, 0x02, 0x14 },