From defbb3b33db7fcbc9da20c1350ce90a6b5e279bb Mon Sep 17 00:00:00 2001 From: "plai@redhat.com" Date: Mon, 1 Jul 2019 16:17:32 +0100 Subject: [PATCH 03/39] target/i386: Disable MPX support on named CPU models MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: plai@redhat.com Message-id: <1561997854-9646-4-git-send-email-plai@redhat.com> Patchwork-id: 89333 O-Subject: [RHEL8.1 qemu-kvm PATCH v6 3/5] target/i386: Disable MPX support on named CPU models Bugzilla: 1629906 RH-Acked-by: Eduardo Habkost RH-Acked-by: Paolo Bonzini RH-Acked-by: Bandan Das From: Paolo Bonzini MPX support is being phased out by Intel; GCC has dropped it, Linux is also going to do that. Even though KVM will have special code to support MPX after the kernel proper stops enabling it in XCR0, we probably also want to deprecate that in a few years. As a start, do not enable it by default for any named CPU model starting with the 4.0 machine types; this include Skylake, Icelake and Cascadelake. Signed-off-by: Paolo Bonzini Message-Id: <20181220121100.21554-1-pbonzini@redhat.com> Reviewed-by:   Wainer dos Santos Moschetta Signed-off-by: Eduardo Habkost (cherry picked from commit ecb85fe48cacb2f8740186e81f2f38a2e02bd963) Signed-off-by: Paul Lai Signed-off-by: Danilo C. L. de Paula Conflicts: hw/i386/pc.c changes to include/hw/i386/pc.h target/i386/cpu.c Signed-off-by: Danilo C. L. de Paula --- target/i386/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index c4b31eb..094f8a1 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -2512,7 +2512,7 @@ static X86CPUDefinition builtin_x86_defs[] = { CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_AVX2 | CPUID_7_0_EBX_SMEP | CPUID_7_0_EBX_BMI2 | CPUID_7_0_EBX_ERMS | CPUID_7_0_EBX_INVPCID | CPUID_7_0_EBX_RTM | CPUID_7_0_EBX_RDSEED | CPUID_7_0_EBX_ADX | - CPUID_7_0_EBX_SMAP | CPUID_7_0_EBX_MPX | CPUID_7_0_EBX_CLWB | + CPUID_7_0_EBX_SMAP | CPUID_7_0_EBX_CLWB | CPUID_7_0_EBX_AVX512F | CPUID_7_0_EBX_AVX512DQ | CPUID_7_0_EBX_AVX512BW | CPUID_7_0_EBX_AVX512CD | CPUID_7_0_EBX_AVX512VL | CPUID_7_0_EBX_CLFLUSHOPT | -- 1.8.3.1