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Date:   Sat, 10 Feb 2018 20:14:59 +0300
From:   Alexander Sergeyev <sergeev917@gmail.com>
To:     David Woodhouse <dwmw@amazon.co.uk>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        Kyle Huey <me@kylehuey.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com>,
        Peter Zijlstra <peterz@infradead.org>,
        linux-kernel@vger.kernel.org
Subject: Re: update spectre v2 microcodes blacklist
Message-ID: <20180210171459.GA12797@localhost.localdomain>
References: <20180210123123.GA19396@localhost.localdomain>
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>I didn't fully match the updated revision guidance and spectre_bad_microcodes

I compared these lists and it seems that the only difference is about skylakes. 
Everything else is covered by less-or-equal criteria on revision version.

Both desktop and mobile skylakes are stated to be unaffected for 0xC2:

{ INTEL_FAM6_SKYLAKE_DESKTOP,    0x03, 0xc2 }, // signature 0x000506E3
{ INTEL_FAM6_SKYLAKE_MOBILE,     0x03, 0xc2 }, // signature 0x000406E3

I reformated the Intel bulletin into json format for ease of automation and 
batch processing -- it is attached.

Raw diff between the mainline blacklist and the bulletin looks like:
@@ -1,5 +1,6 @@
 { INTEL_FAM6_BROADWELL_CORE,     0x04, 0x28 },
 { INTEL_FAM6_BROADWELL_GT3E,     0x01, 0x1b },
+{ INTEL_FAM6_BROADWELL_X,        0x01, 0x0b000023 },
 { INTEL_FAM6_BROADWELL_X,        0x01, 0x0b000025 },
 { INTEL_FAM6_BROADWELL_XEON_D,   0x02, 0x14 },
 { INTEL_FAM6_BROADWELL_XEON_D,   0x03, 0x07000011 },
@@ -9,12 +10,10 @@
 { INTEL_FAM6_HASWELL_X,          0x02, 0x3b },
 { INTEL_FAM6_HASWELL_X,          0x04, 0x10 },
 { INTEL_FAM6_IVYBRIDGE_X,        0x04, 0x42a },
-{ INTEL_FAM6_KABYLAKE_DESKTOP,   0x09, 0x84 },
-{ INTEL_FAM6_KABYLAKE_DESKTOP,   0x0a, 0x84 },
-{ INTEL_FAM6_KABYLAKE_DESKTOP,   0x0b, 0x84 },
-{ INTEL_FAM6_KABYLAKE_MOBILE,    0x09, 0x84 },
-{ INTEL_FAM6_KABYLAKE_MOBILE,    0x0a, 0x84 },
-{ INTEL_FAM6_SKYLAKE_DESKTOP,    0x03, 0xc2 },
-{ INTEL_FAM6_SKYLAKE_MOBILE,     0x03, 0xc2 },
-{ INTEL_FAM6_SKYLAKE_X,          0x03, 0x0100013e },
+{ INTEL_FAM6_KABYLAKE_DESKTOP,   0x09, 0x80 },
+{ INTEL_FAM6_KABYLAKE_DESKTOP,   0x0a, 0x80 },
+{ INTEL_FAM6_KABYLAKE_DESKTOP,   0x0b, 0x80 },
+{ INTEL_FAM6_KABYLAKE_MOBILE,    0x09, 0x80 },
+{ INTEL_FAM6_KABYLAKE_MOBILE,    0x0a, 0x80 },
+{ INTEL_FAM6_SKYLAKE_X,          0x04, 0x0200003a },
 { INTEL_FAM6_SKYLAKE_X,          0x04, 0x0200003c },

Note: Gemini Lake and Sandy Bridge are not considered (observed in wild).

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Content-Type: application/json
Content-Disposition: attachment; filename="microcode-update-guidance.json"
Content-Transfer-Encoding: quoted-printable

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