File 0444-i386-Add-FEAT_8000_0008_EBX-CPUID-f.patch of Package qemu-linux-user.7445

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File 0444-i386-Add-FEAT_8000_0008_EBX-CPUID-f.patch of Package qemu-linux-user.7445

From 5e14e06caf28f9c7abfdfe335acfe7854f254388 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 | 19 ++++++++++++++++++-
 target-i386/cpu.h |  3 +++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 7a738e79e8..f61e60b066 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -273,6 +273,17 @@ static const char *cpuid_7_0_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,
+};
+
 typedef struct FeatureWordInfo {
     const char **feat_names;
     uint32_t cpuid_eax;   /* Input EAX for CPUID */
@@ -322,6 +333,11 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .cpuid_needs_ecx = true, .cpuid_ecx = 0,
         .cpuid_reg = R_EDX,
     },
+    [FEAT_8000_0008_EBX] = {
+        .feat_names = cpuid_ibpb_ebx_feature_name,
+        .cpuid_eax = 0x80000008,
+        .cpuid_reg = R_EBX,
+    },
 };
 
 typedef struct X86RegisterInfo32 {
@@ -2380,7 +2396,7 @@ 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) {
@@ -2637,6 +2653,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
         env->features[FEAT_7_0_EDX] &= TCG_7_0_EDX_FEATURES;
         env->features[FEAT_8000_0001_EDX] &= TCG_EXT2_FEATURES;
         env->features[FEAT_8000_0001_ECX] &= TCG_EXT3_FEATURES;
+        env->features[FEAT_8000_0008_EBX] &= 0;
         env->features[FEAT_SVM] &= TCG_SVM_FEATURES;
     } else {
         KVMState *s = kvm_state;
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 936fbf6c1d..f6c6ea07f7 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -402,6 +402,7 @@ typedef enum FeatureWord {
     FEAT_7_0_EDX,       /* CPUID[EAX=7,ECX=0].EDX */
     FEAT_8000_0001_EDX, /* CPUID[8000_0001].EDX */
     FEAT_8000_0001_ECX, /* CPUID[8000_0001].ECX */
+    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 */
@@ -562,6 +563,8 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
 #define CPUID_7_0_EBX_SMAP     (1U << 20)
 #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_VENDOR_SZ      12
 
 #define CPUID_VENDOR_INTEL_1 0x756e6547 /* "Genu" */

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File 0444-i386-Add-FEAT_8000_0008_EBX-CPUID-f.patch of Package qemu-linux-user.7445

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