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From 2b13f79a51b0106170cd0b5d9996a3a553d8781e Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Wed, 9 Oct 2019 17:51:40 +0200
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Subject: [PATCH 02/10] target-i386: Isolate KVM-specific code on CPU feature
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filtering logic
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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: <20191009175148.1361-3-ehabkost@redhat.com>
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Patchwork-id: 91358
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O-Subject: [RHEL-7.7.z qemu-kvm PATCH 02/10] target-i386: Isolate KVM-specific code on CPU feature filtering logic
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Bugzilla: 1730606
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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This will allow us to re-use the feature filtering logic (and the
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check/enforce flag logic) for TCG.
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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 27418adf32b9cd164d464fffc4fc0505d6b2b15d)
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Signed-off-by: Paul Lai <plai@redhat.com>
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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 | 21 +++++++++++++--------
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1 file changed, 13 insertions(+), 8 deletions(-)
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diff --git a/target-i386/cpu.c b/target-i386/cpu.c
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index c9d7557..5cfed19 100644
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--- a/target-i386/cpu.c
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+++ b/target-i386/cpu.c
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@@ -2367,6 +2367,16 @@ CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
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return cpu_list;
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}
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+static uint32_t x86_cpu_get_supported_feature_word(FeatureWord w)
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+{
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+ FeatureWordInfo *wi = &feature_word_info[w];
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+
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+ assert(kvm_enabled());
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+ return kvm_arch_get_supported_cpuid(kvm_state, wi->cpuid_eax,
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+ wi->cpuid_ecx,
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+ wi->cpuid_reg);
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+}
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+
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/*
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* Filters CPU feature words based on host availability of each feature.
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*
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@@ -2374,20 +2384,15 @@ CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
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*
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* Returns: 0 if all flags are supported by the host, non-zero otherwise.
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*/
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-static int filter_features_for_kvm(X86CPU *cpu)
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+static int x86_cpu_filter_features(X86CPU *cpu)
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{
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CPUX86State *env = &cpu->env;
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- KVMState *s = kvm_state;
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FeatureWord w;
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int rv = 0;
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- assert(kvm_enabled());
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-
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for (w = 0; w < FEATURE_WORDS; w++) {
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FeatureWordInfo *wi = &feature_word_info[w];
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- uint32_t host_feat = kvm_arch_get_supported_cpuid(s, wi->cpuid_eax,
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- wi->cpuid_ecx,
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- wi->cpuid_reg);
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+ uint32_t host_feat = x86_cpu_get_supported_feature_word(w);
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uint32_t requested_features = env->features[w];
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env->features[w] &= host_feat;
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cpu->filtered_features[w] = requested_features & ~env->features[w];
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@@ -3070,7 +3075,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
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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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- if (filter_features_for_kvm(cpu) && cpu->enforce_cpuid) {
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+ if (x86_cpu_filter_features(cpu) && cpu->enforce_cpuid) {
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error_setg(&local_err,
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"Host's CPU doesn't support requested features");
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goto out;
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--
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1.8.3.1
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