From 8c311241e277756db896fdab983c6250ffde5fc0 Mon Sep 17 00:00:00 2001 From: Eduardo Habkost Date: Sat, 13 Oct 2018 03:32:30 +0100 Subject: [PATCH 17/17] i386: define the 'ssbd' CPUID feature bit (CVE-2018-3639) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Eduardo Habkost Message-id: <20181013033230.14687-2-ehabkost@redhat.com> Patchwork-id: 82685 O-Subject: [RHEL8/rhel qemu-kvm PATCH 1/1] i386: define the 'ssbd' CPUID feature bit (CVE-2018-3639) Bugzilla: 1633928 RH-Acked-by: Paolo Bonzini RH-Acked-by: Igor Mammedov RH-Acked-by: Daniel P. Berrange From: Daniel P. Berrangé New microcode introduces the "Speculative Store Bypass Disable" CPUID feature bit. This needs to be exposed to guest OS to allow them to protect against CVE-2018-3639. Signed-off-by: Daniel P. Berrangé Reviewed-by: Konrad Rzeszutek Wilk Signed-off-by: Konrad Rzeszutek Wilk Message-Id: <20180521215424.13520-2-berrange@redhat.com> Signed-off-by: Eduardo Habkost (cherry picked from commit d19d1f965904a533998739698020ff4ee8a103da) Signed-off-by: Eduardo Habkost Signed-off-by: Danilo C. L. de Paula --- target/i386/cpu.c | 2 +- target/i386/cpu.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 0215b20..228935f 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1008,7 +1008,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "spec-ctrl", NULL, - NULL, NULL, NULL, NULL, + NULL, NULL, NULL, "ssbd", }, .cpuid_eax = 7, .cpuid_needs_ecx = true, .cpuid_ecx = 0, diff --git a/target/i386/cpu.h b/target/i386/cpu.h index c47db96..4a3ef4b 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -685,6 +685,7 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS]; #define CPUID_7_0_EDX_AVX512_4VNNIW (1U << 2) /* AVX512 Neural Network Instructions */ #define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply Accumulation Single Precision */ #define CPUID_7_0_EDX_SPEC_CTRL (1U << 26) /* Speculation Control */ +#define CPUID_7_0_EDX_SPEC_CTRL_SSBD (1U << 31) /* Speculative Store Bypass Disable */ #define KVM_HINTS_DEDICATED (1U << 0) -- 1.8.3.1