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From d5526e43ccf3532aa3a0f592e6df5740983a94e2 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 22 Nov 2019 11:53:35 +0000
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Subject: [PATCH 02/16] i386: Add x-force-features option for testing
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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: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <20191122115348.25000-3-pbonzini@redhat.com>
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Patchwork-id: 92602
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O-Subject: [RHEL8.2/rhel qemu-kvm PATCH 02/15] i386: Add x-force-features option for testing
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Bugzilla: 1689270
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Maxim Levitsky <mlevitsk@redhat.com>
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From: Eduardo Habkost <ehabkost@redhat.com>
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Add a new option that can be used to disable feature flag
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filtering. This will allow CPU model compatibility test cases to
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work without host hardware dependencies.
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Message-Id: <20190628002844.24894-3-ehabkost@redhat.com>
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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(cherry picked from commit dac1deae658539e39966e12b12378a28e3dc8441)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/i386/cpu.c | 8 ++++++--
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target/i386/cpu.h | 6 ++++++
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2 files changed, 12 insertions(+), 2 deletions(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index c69116c..8c1338f 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -5019,8 +5019,11 @@ static int x86_cpu_filter_features(X86CPU *cpu)
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uint32_t host_feat =
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x86_cpu_get_supported_feature_word(w, false);
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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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+ uint32_t available_features = requested_features & host_feat;
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+ if (!cpu->force_features) {
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+ env->features[w] = available_features;
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+ }
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+ cpu->filtered_features[w] = requested_features & ~available_features;
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if (cpu->filtered_features[w]) {
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rv = 1;
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}
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@@ -5680,6 +5683,7 @@ static Property x86_cpu_properties[] = {
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DEFINE_PROP_BOOL("hv-frequencies", X86CPU, hyperv_frequencies, false),
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DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, true),
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DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false),
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+ DEFINE_PROP_BOOL("x-force-features", X86CPU, force_features, false),
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DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true),
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DEFINE_PROP_UINT32("phys-bits", X86CPU, phys_bits, 0),
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DEFINE_PROP_BOOL("host-phys-bits", X86CPU, host_phys_bits, false),
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diff --git a/target/i386/cpu.h b/target/i386/cpu.h
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index add8b60..1ad54bd 100644
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--- a/target/i386/cpu.h
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+++ b/target/i386/cpu.h
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@@ -1394,6 +1394,12 @@ struct X86CPU {
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bool hyperv_frequencies;
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bool check_cpuid;
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bool enforce_cpuid;
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+ /*
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+ * Force features to be enabled even if the host doesn't support them.
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+ * This is dangerous and should be done only for testing CPUID
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+ * compatibility.
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+ */
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+ bool force_features;
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bool expose_kvm;
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bool expose_tcg;
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bool migratable;
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--
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1.8.3.1
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