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From 91e436476830a82f429e1df848ea751280580b46 Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Thu, 23 Feb 2017 14:29:45 +0100
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Subject: [PATCH 15/17] target-i386: Loop-based feature word filtering in TCG
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mode
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <20170223142945.17790-15-ehabkost@redhat.com>
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Patchwork-id: 74046
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O-Subject: [RHEL-7.4 qemu-kvm PATCH v2 14/14] target-i386: Loop-based feature word filtering in TCG mode
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Bugzilla: 1382122
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Instead of manually filtering each feature word, add a tcg_features
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field to FeatureWordInfo, and use that field to filter all feature words
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in TCG mode.
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Reviewed-by: Richard Henderson <rth@twiddle.net>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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(cherry picked from commit 37ce3522cb88c524caec57cb52a4bfbb880abbe5)
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target-i386/cpu.c | 26 +++++++++++++++-----------
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1 file changed, 15 insertions(+), 11 deletions(-)
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diff --git a/target-i386/cpu.c b/target-i386/cpu.c
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index 010b95f..38056eb 100644
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--- a/target-i386/cpu.c
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+++ b/target-i386/cpu.c
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@@ -254,54 +254,65 @@ typedef struct FeatureWordInfo {
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bool cpuid_needs_ecx; /* CPUID instruction uses ECX as input */
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uint32_t cpuid_ecx; /* Input ECX value for CPUID */
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int cpuid_reg; /* output register (R_* constant) */
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+ uint32_t tcg_features; /* Feature flags supported by TCG */
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} FeatureWordInfo;
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static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
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[FEAT_1_EDX] = {
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.feat_names = feature_name,
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.cpuid_eax = 1, .cpuid_reg = R_EDX,
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+ .tcg_features = TCG_FEATURES,
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},
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[FEAT_1_ECX] = {
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.feat_names = ext_feature_name,
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.cpuid_eax = 1, .cpuid_reg = R_ECX,
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+ .tcg_features = TCG_EXT_FEATURES,
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},
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[FEAT_8000_0001_EDX] = {
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.feat_names = ext2_feature_name,
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.cpuid_eax = 0x80000001, .cpuid_reg = R_EDX,
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+ .tcg_features = TCG_EXT2_FEATURES,
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},
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[FEAT_8000_0001_ECX] = {
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.feat_names = ext3_feature_name,
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.cpuid_eax = 0x80000001, .cpuid_reg = R_ECX,
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+ .tcg_features = TCG_EXT3_FEATURES,
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},
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[FEAT_C000_0001_EDX] = {
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.feat_names = ext4_feature_name,
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.cpuid_eax = 0xC0000001, .cpuid_reg = R_EDX,
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+ .tcg_features = TCG_EXT4_FEATURES,
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},
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[FEAT_KVM] = {
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.feat_names = kvm_feature_name,
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.cpuid_eax = KVM_CPUID_FEATURES, .cpuid_reg = R_EAX,
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+ .tcg_features = TCG_KVM_FEATURES,
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},
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[FEAT_SVM] = {
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.feat_names = svm_feature_name,
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.cpuid_eax = 0x8000000A, .cpuid_reg = R_EDX,
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+ .tcg_features = TCG_SVM_FEATURES,
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},
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[FEAT_7_0_EBX] = {
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.feat_names = cpuid_7_0_ebx_feature_name,
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.cpuid_eax = 7,
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.cpuid_needs_ecx = true, .cpuid_ecx = 0,
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.cpuid_reg = R_EBX,
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+ .tcg_features = TCG_7_0_EBX_FEATURES,
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},
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[FEAT_7_0_ECX] = {
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.feat_names = cpuid_7_0_ecx_feature_name,
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.cpuid_eax = 7,
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.cpuid_needs_ecx = true, .cpuid_ecx = 0,
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.cpuid_reg = R_ECX,
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+ .tcg_features = TCG_7_0_ECX_FEATURES,
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},
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[FEAT_7_0_EDX] = {
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.feat_names = cpuid_7_0_edx_feature_name,
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.cpuid_eax = 7,
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.cpuid_needs_ecx = true, .cpuid_ecx = 0,
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.cpuid_reg = R_EDX,
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+ .tcg_features = TCG_7_0_EDX_FEATURES,
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},
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[FEAT_XSAVE] = {
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.feat_names = cpuid_xsave_feature_name,
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@@ -2617,17 +2628,10 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
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}
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if (!kvm_enabled()) {
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- env->features[FEAT_1_EDX] &= TCG_FEATURES;
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- env->features[FEAT_1_ECX] &= TCG_EXT_FEATURES;
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- env->features[FEAT_7_0_EBX] &= TCG_7_0_EBX_FEATURES;
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- env->features[FEAT_8000_0001_EDX] &= TCG_EXT2_FEATURES;
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- env->features[FEAT_8000_0001_ECX] &= TCG_EXT3_FEATURES;
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- env->features[FEAT_SVM] &= TCG_SVM_FEATURES;
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- env->features[FEAT_KVM] &= TCG_KVM_FEATURES;
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- env->features[FEAT_C000_0001_EDX] &= TCG_EXT4_FEATURES;
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- env->features[FEAT_XSAVE] = 0;
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- env->features[FEAT_7_0_ECX] &= TCG_7_0_ECX_FEATURES;
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- env->features[FEAT_7_0_EDX] &= TCG_7_0_EDX_FEATURES;
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+ FeatureWord w;
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+ for (w = 0; w < FEATURE_WORDS; w++) {
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+ env->features[w] &= feature_word_info[w].tcg_features;
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+ }
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} else {
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KVMState *s = kvm_state;
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if ((cpu->check_cpuid || cpu->enforce_cpuid)
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--
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1.8.3.1
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