linux-kernel - [tip: perf/core] perf/x86/kvm: Add Cascade Lake Xeon steppings to isolation

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Message-ID: <161296557060.23325.2852849746600741313.tip-bot2@tip-bot2>
Date:   Wed, 10 Feb 2021 13:59:30 -0000
From:   "tip-bot2 for Jim Mattson" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Jim Mattson <jmattson@...gle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Andi Kleen <ak@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf/x86/kvm: Add Cascade Lake Xeon steppings to
 isolation_ucodes[]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     b3c3361fe325074d4144c29d46daae4fc5a268d5
Gitweb:        https://git.kernel.org/tip/b3c3361fe325074d4144c29d46daae4fc5a268d5
Author:        Jim Mattson <jmattson@...gle.com>
AuthorDate:    Fri, 05 Feb 2021 11:13:24 -08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 10 Feb 2021 14:44:54 +01:00

perf/x86/kvm: Add Cascade Lake Xeon steppings to isolation_ucodes[]

Cascade Lake Xeon parts have the same model number as Skylake Xeon
parts, so they are tagged with the intel_pebs_isolation
quirk. However, as with Skylake Xeon H0 stepping parts, the PEBS
isolation issue is fixed in all microcode versions.

Add the Cascade Lake Xeon steppings (5, 6, and 7) to the
isolation_ucodes[] table so that these parts benefit from Andi's
optimization in commit 9b545c04abd4f ("perf/x86/kvm: Avoid unnecessary
work in guest filtering").

Signed-off-by: Jim Mattson <jmattson@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Link: https://lkml.kernel.org/r/20210205191324.2889006-1-jmattson@google.com
---
 arch/x86/events/intel/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 67a7246..5bac48d 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -4513,6 +4513,9 @@ static const struct x86_cpu_desc isolation_ucodes[] = {
 	INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_X,		 2, 0x0b000014),
 	INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X,		 3, 0x00000021),
 	INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X,		 4, 0x00000000),
+	INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X,		 5, 0x00000000),
+	INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X,		 6, 0x00000000),
+	INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X,		 7, 0x00000000),
 	INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_L,		 3, 0x0000007c),
 	INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE,		 3, 0x0000007c),
 	INTEL_CPU_DESC(INTEL_FAM6_KABYLAKE,		 9, 0x0000004e),