From 2b13f79a51b0106170cd0b5d9996a3a553d8781e Mon Sep 17 00:00:00 2001
From: Eduardo Habkost <ehabkost@redhat.com>
Date: Wed, 9 Oct 2019 17:51:40 +0200
Subject: [PATCH 02/10] target-i386: Isolate KVM-specific code on CPU feature
 filtering logic
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
Message-id: <20191009175148.1361-3-ehabkost@redhat.com>
Patchwork-id: 91358
O-Subject: [RHEL-7.7.z qemu-kvm PATCH 02/10] target-i386: Isolate KVM-specific code on CPU feature filtering logic
Bugzilla: 1730606
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Bandan Das <bsd@redhat.com>
RH-Acked-by: Igor Mammedov <imammedo@redhat.com>

This will allow us to re-use the feature filtering logic (and the
check/enforce flag logic) for TCG.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
(cherry picked from commit 27418adf32b9cd164d464fffc4fc0505d6b2b15d)
Signed-off-by: Paul Lai <plai@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 target-i386/cpu.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index c9d7557..5cfed19 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2367,6 +2367,16 @@ CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
     return cpu_list;
 }
 
+static uint32_t x86_cpu_get_supported_feature_word(FeatureWord w)
+{
+    FeatureWordInfo *wi = &feature_word_info[w];
+
+    assert(kvm_enabled());
+    return kvm_arch_get_supported_cpuid(kvm_state, wi->cpuid_eax,
+                                                   wi->cpuid_ecx,
+                                                   wi->cpuid_reg);
+}
+
 /*
  * Filters CPU feature words based on host availability of each feature.
  *
@@ -2374,20 +2384,15 @@ CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
  *
  * Returns: 0 if all flags are supported by the host, non-zero otherwise.
  */
-static int filter_features_for_kvm(X86CPU *cpu)
+static int x86_cpu_filter_features(X86CPU *cpu)
 {
     CPUX86State *env = &cpu->env;
-    KVMState *s = kvm_state;
     FeatureWord w;
     int rv = 0;
 
-    assert(kvm_enabled());
-
     for (w = 0; w < FEATURE_WORDS; w++) {
         FeatureWordInfo *wi = &feature_word_info[w];
-        uint32_t host_feat = kvm_arch_get_supported_cpuid(s, wi->cpuid_eax,
-                                                             wi->cpuid_ecx,
-                                                             wi->cpuid_reg);
+        uint32_t host_feat = x86_cpu_get_supported_feature_word(w);
         uint32_t requested_features = env->features[w];
         env->features[w] &= host_feat;
         cpu->filtered_features[w] = requested_features & ~env->features[w];
@@ -3070,7 +3075,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
             env->features[w] &= feature_word_info[w].tcg_features;
         }
     } else {
-        if (filter_features_for_kvm(cpu) && cpu->enforce_cpuid) {
+        if (x86_cpu_filter_features(cpu) && cpu->enforce_cpuid) {
             error_setg(&local_err,
                        "Host's CPU doesn't support requested features");
             goto out;
-- 
1.8.3.1