File 0278-i386-Add-FEAT_8000_0008_EBX-CPUID-f.patch of Package qemu.20756

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File 0278-i386-Add-FEAT_8000_0008_EBX-CPUID-f.patch of Package qemu.20756

From: Eduardo Habkost <ehabkost@redhat.com>
Date: Tue, 9 Jan 2018 13:45:16 -0200
Subject: 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 ee0627273cb5e11d0c75a04f77a6..94912923a2444ddc5283f6eec810 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 3b3f9f945c1cc540b65afe819e16..d19a7f176092a7feda7700424a39 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)

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File 0278-i386-Add-FEAT_8000_0008_EBX-CPUID-f.patch of Package qemu.20756

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