This is a note to let you know that I've just added the patch titled
x86/speculation: Correct Speculation Control microcode blacklist again
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d37fc6d360a404b208547ba112e7dabb6533c7fc Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw@xxxxxxxxxxxx>
Date: Mon, 12 Feb 2018 15:27:34 +0000
Subject: x86/speculation: Correct Speculation Control microcode blacklist again
From: David Woodhouse <dwmw@xxxxxxxxxxxx>
commit d37fc6d360a404b208547ba112e7dabb6533c7fc upstream.
Arjan points out that the Intel document only clears the 0xc2 microcode
on *some* parts with CPUID 506E3 (INTEL_FAM6_SKYLAKE_DESKTOP stepping 3).
For the Skylake H/S platform it's OK but for Skylake E3 which has the
same CPUID it isn't (yet) cleared.
So removing it from the blacklist was premature. Put it back for now.
Also, Arjan assures me that the 0x84 microcode for Kaby Lake which was
featured in one of the early revisions of the Intel document was never
released to the public, and won't be until/unless it is also validated
as safe. So those can change to 0x80 which is what all *other* versions
of the doc have identified.
Once the retrospective testing of existing public microcodes is done, we
should be back into a mode where new microcodes are only released in
batches and we shouldn't even need to update the blacklist for those
anyway, so this tweaking of the list isn't expected to be a thing which
keeps happening.
Requested-by: Arjan van de Ven <arjan.van.de.ven@xxxxxxxxx>
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: arjan.van.de.ven@xxxxxxxxx
Cc: dave.hansen@xxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: pbonzini@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1518449255-2182-1-git-send-email-dwmw@xxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/intel.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -75,13 +75,14 @@ struct sku_microcode {
u32 microcode;
};
static const struct sku_microcode spectre_bad_microcodes[] = {
- { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0B, 0x84 },
- { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0A, 0x84 },
- { INTEL_FAM6_KABYLAKE_DESKTOP, 0x09, 0x84 },
- { INTEL_FAM6_KABYLAKE_MOBILE, 0x0A, 0x84 },
- { INTEL_FAM6_KABYLAKE_MOBILE, 0x09, 0x84 },
+ { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0B, 0x80 },
+ { INTEL_FAM6_KABYLAKE_DESKTOP, 0x0A, 0x80 },
+ { INTEL_FAM6_KABYLAKE_DESKTOP, 0x09, 0x80 },
+ { INTEL_FAM6_KABYLAKE_MOBILE, 0x0A, 0x80 },
+ { 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 },
Patches currently in stable-queue which might be from dwmw@xxxxxxxxxxxx are
queue-4.9/x86-nvmx-properly-set-spec_ctrl-and-pred_cmd-before-merging-msrs.patch
queue-4.9/x86-speculation-update-speculation-control-microcode-blacklist.patch
queue-4.9/x86-speculation-correct-speculation-control-microcode-blacklist-again.patch
queue-4.9/kvm-x86-reduce-retpoline-performance-impact-in-slot_handle_level_range-by-always-inlining-iterator-helper-methods.patch
queue-4.9/x86-speculation-clean-up-various-spectre-related-details.patch