File 0278-i386-Add-FEAT_8000_0008_EBX-CPUID-f.patch of Package qemu.12243
From 141e9f22a4787ec0b47e8a79291096b89c576183 Mon Sep 17 00:00:00 2001
From: Eduardo Habkost <ehabkost@redhat.com>
Date: Tue, 9 Jan 2018 13:45:16 -0200
Subject: [PATCH] i386: Add FEAT_8000_0008_EBX CPUID feature word
Add the new feature word and the "ibpb" feature flag.
Based on a patch by Paolo Bonzini.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20180109154519.25634-5-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
(cherry picked from commit 1b3420e1c4d523c49866cca4e7544753201cd43d)
[BR: BSC#1068032 CVE-2017-5715 change to match current code's feat_name
type]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
target-i386/cpu.c | 20 +++++++++++++++++++-
target-i386/cpu.h | 3 +++
2 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index ee0627273c..94912923a2 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -303,6 +303,17 @@ static const char *cpuid_apm_edx_feature_name[] = {
NULL, NULL, NULL, NULL,
};
+static const char *cpuid_ibpb_ebx_feature_name[] = {
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+ "ibpb", NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL,
+};
+
static const char *cpuid_xsave_feature_name[] = {
"xsaveopt", "xsavec", "xgetbv1", "xsaves",
NULL, NULL, NULL, NULL,
@@ -463,6 +474,13 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
.tcg_features = TCG_APM_FEATURES,
.unmigratable_flags = CPUID_APM_INVTSC,
},
+ [FEAT_8000_0008_EBX] = {
+ .feat_names = cpuid_ibpb_ebx_feature_name,
+ .cpuid_eax = 0x80000008,
+ .cpuid_reg = R_EBX,
+ .tcg_features = 0,
+ .unmigratable_flags = 0,
+ },
[FEAT_XSAVE] = {
.feat_names = cpuid_xsave_feature_name,
.cpuid_eax = 0xd,
@@ -2686,7 +2704,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*eax = 0x00000020; /* 32 bits physical */
}
}
- *ebx = 0;
+ *ebx = env->features[FEAT_8000_0008_EBX];
*ecx = 0;
*edx = 0;
if (cs->nr_cores * cs->nr_threads > 1) {
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 3b3f9f945c..d19a7f1760 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -439,6 +439,7 @@ typedef enum FeatureWord {
FEAT_8000_0001_EDX, /* CPUID[8000_0001].EDX */
FEAT_8000_0001_ECX, /* CPUID[8000_0001].ECX */
FEAT_8000_0007_EDX, /* CPUID[8000_0007].EDX */
+ FEAT_8000_0008_EBX, /* CPUID[8000_0008].EBX */
FEAT_C000_0001_EDX, /* CPUID[C000_0001].EDX */
FEAT_KVM, /* CPUID[4000_0001].EAX (KVM_CPUID_FEATURES) */
FEAT_SVM, /* CPUID[8000_000A].EDX */
@@ -611,6 +612,8 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
#define CPUID_7_0_ECX_OSPKE (1U << 4)
#define CPUID_7_0_EDX_SPEC_CTRL (1U << 26) /* Speculation Control */
+#define CPUID_8000_0008_EBX_IBPB (1U << 12) /* Indirect Branch Prediction Barrier */
+
#define CPUID_XSAVE_XSAVEOPT (1U << 0)
#define CPUID_XSAVE_XSAVEC (1U << 1)
#define CPUID_XSAVE_XGETBV1 (1U << 2)
