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From defbb3b33db7fcbc9da20c1350ce90a6b5e279bb Mon Sep 17 00:00:00 2001
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From: "plai@redhat.com" <plai@redhat.com>
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Pablo Greco |
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Date: Mon, 1 Jul 2019 16:17:32 +0100
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Subject: [PATCH 03/39] target/i386: Disable MPX support on named CPU models
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: plai@redhat.com
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Message-id: <1561997854-9646-4-git-send-email-plai@redhat.com>
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Patchwork-id: 89333
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O-Subject: [RHEL8.1 qemu-kvm PATCH v6 3/5] target/i386: Disable MPX support on named CPU models
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Bugzilla: 1629906
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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MPX support is being phased out by Intel; GCC has dropped it, Linux
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is also going to do that. Even though KVM will have special code
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to support MPX after the kernel proper stops enabling it in XCR0,
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we probably also want to deprecate that in a few years. As a start,
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do not enable it by default for any named CPU model starting with
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the 4.0 machine types; this include Skylake, Icelake and Cascadelake.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Message-Id: <20181220121100.21554-1-pbonzini@redhat.com>
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Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit ecb85fe48cacb2f8740186e81f2f38a2e02bd963)
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Signed-off-by: Paul Lai <plai@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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Conflicts:
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hw/i386/pc.c changes to include/hw/i386/pc.h
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target/i386/cpu.c
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/i386/cpu.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index c4b31eb..094f8a1 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -2512,7 +2512,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
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CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_AVX2 | CPUID_7_0_EBX_SMEP |
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CPUID_7_0_EBX_BMI2 | CPUID_7_0_EBX_ERMS | CPUID_7_0_EBX_INVPCID |
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CPUID_7_0_EBX_RTM | CPUID_7_0_EBX_RDSEED | CPUID_7_0_EBX_ADX |
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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_SMAP | 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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--
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1.8.3.1
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