From: David Woodhouse <dwmw2@infradead.org>
To: tglx@linutronix.de, karahmed@amazon.de, sironi@amazon.de,
x86@kernel.org, kvm@vger.kernel.org,
torvalds@linux-foundation.org, pbonzini@redhat.com,
linux-kernel@vger.kernel.org, bp@alien8.de, peterz@infradead.org,
jmattson@google.com, rkrcmar@redhat.com,
arjan.van.de.ven@intel.com, dave.hansen@intel.com
Subject: Re: [PATCH v2 1/6] x86/speculation: Update Speculation Control microcode blacklist
Date: Mon, 12 Feb 2018 14:16:30 +0000 [thread overview]
Message-ID: <1518444989.6606.83.camel@infradead.org> (raw)
In-Reply-To: <1518305967-31356-2-git-send-email-dwmw@amazon.co.uk>
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On Sat, 2018-02-10 at 23:39 +0000, David Woodhouse wrote:
>
> --- a/arch/x86/kernel/cpu/intel.c
> +++ b/arch/x86/kernel/cpu/intel.c
> @@ -123,8 +123,6 @@ static const struct sku_microcode
> spectre_bad_microcodes[] = {
> { INTEL_FAM6_KABYLAKE_MOBILE, 0x09, 0x84 },
> { INTEL_FAM6_SKYLAKE_X, 0x03, 0x0100013e },
> { INTEL_FAM6_SKYLAKE_X, 0x04, 0x0200003c },
> - { INTEL_FAM6_SKYLAKE_MOBILE, 0x03, 0xc2 },
> - { 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 },
Arjan points out that the SKYLAKE_DESKTOP one there is premature. There
are *two* rows in Intel's table which match that CPUID (506E3).
Only *one* of them ("Skylake H/S") has cleared the 0xC2 microcode for
use, while the "Skylake E3" line still doesn't approve it. (But doesn't
explicitly list it in the "STOP deploying" column any more either,
which it probably should, and might have helped me notice.)
Ingo, Thomas: do you want to drop this patch which is already in
tip/x86/pti and have a new version with the SKYLAKE_DESKTOP no longer
removed? Or shall I send an incremental patch to add it back?
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next prev parent reply other threads:[~2018-02-12 14:16 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-10 23:39 [PATCH v2 0/6] Spectre v2 updates David Woodhouse
2018-02-10 23:39 ` [PATCH v2 1/6] x86/speculation: Update Speculation Control microcode blacklist David Woodhouse
2018-02-12 9:50 ` Darren Kenny
2018-02-12 14:16 ` David Woodhouse [this message]
2018-02-12 14:32 ` Thomas Gleixner
2018-02-10 23:39 ` [PATCH v2 2/6] Revert "x86/speculation: Simplify indirect_branch_prediction_barrier()" David Woodhouse
2018-02-10 23:39 ` [PATCH v2 3/6] KVM: x86: Reduce retpoline performance impact in slot_handle_level_range() David Woodhouse
2018-02-10 23:39 ` [PATCH v2 4/6] X86/nVMX: Properly set spec_ctrl and pred_cmd before merging MSRs David Woodhouse
2018-02-10 23:39 ` [PATCH v2 5/6] KVM/nVMX: Set the CPU_BASED_USE_MSR_BITMAPS if we have a valid L02 MSR bitmap David Woodhouse
2018-02-11 10:19 ` Ingo Molnar
[not found] ` <1518345844.3677.365.camel@amazon.co.uk>
2018-02-11 10:55 ` Ingo Molnar
2018-02-10 23:39 ` [PATCH v2 6/6] x86/speculation: Use IBRS if available before calling into firmware David Woodhouse
2018-02-11 11:46 ` Ingo Molnar
2018-02-11 10:41 ` [PATCH v2 0/6] Spectre v2 updates Ingo Molnar
[not found] ` <1518362359-1005-1-git-send-email-dwmw@amazon.co.uk>
2018-02-11 18:50 ` [PATCH] x86/speculation: Clean up various Spectre related details Ingo Molnar
2018-02-11 19:25 ` David Woodhouse
2018-02-11 19:43 ` Ingo Molnar
2018-02-12 15:30 ` David Woodhouse
2018-02-13 8:04 ` Ingo Molnar
2018-02-12 8:27 ` [PATCH v2 0/6] Spectre v2 updates Paolo Bonzini
2018-02-13 7:59 ` Ingo Molnar
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