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From 4d23f26f51e1a4b4a8c7aa2d105891e4589f913c Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Thu, 3 Oct 2019 22:12:17 +0200
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Subject: [PATCH 3/4] i386: remove the 'INTEL_PT' CPUID bit from
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Cascadelake-Server
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <20191003221217.8527-4-ehabkost@redhat.com>
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Patchwork-id: 90954
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O-Subject: [RHEL-7.8 qemu-kvm PATCH 3/3] i386: remove the 'INTEL_PT' CPUID bit from Cascadelake-Server
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Bugzilla: 1638471
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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This is a partial cherry pick of upstream commit:
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commit 4c257911dcc7c4189768e9651755c849ce9db4e8
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Author: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri Dec 21 12:35:56 2018 +0100
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i386: remove the 'INTEL_PT' CPUID bit from named CPU models
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Processor tracing is not yet implemented for KVM and it will be an
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opt in feature requiring a special module parameter.
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Disable it, because it is wrong to enable it by default and
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it is impossible that no one has ever used it.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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It includes only the Cascadelake-Server change, because the other
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CPU models are not present in the RHEL7 tree.
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target-i386/cpu.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/target-i386/cpu.c b/target-i386/cpu.c
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index 926373b..b4839df 100644
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--- a/target-i386/cpu.c
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+++ b/target-i386/cpu.c
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@@ -1528,8 +1528,7 @@ static x86_def_t builtin_x86_defs[] = {
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CPUID_7_0_EBX_SMAP | CPUID_7_0_EBX_MPX | CPUID_7_0_EBX_CLWB |
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CPUID_7_0_EBX_AVX512F | CPUID_7_0_EBX_AVX512DQ |
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CPUID_7_0_EBX_AVX512BW | CPUID_7_0_EBX_AVX512CD |
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- CPUID_7_0_EBX_AVX512VL | CPUID_7_0_EBX_CLFLUSHOPT |
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- CPUID_7_0_EBX_INTEL_PT,
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+ CPUID_7_0_EBX_AVX512VL | CPUID_7_0_EBX_CLFLUSHOPT,
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.features[FEAT_7_0_ECX] =
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CPUID_7_0_ECX_PKU |
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CPUID_7_0_ECX_AVX512VNNI,
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--
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1.8.3.1
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