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From 7530a2f3975b76711467226f8b279baf36d92e46 Mon Sep 17 00:00:00 2001
From: Eduardo Habkost <ehabkost@redhat.com>
Date: Tue, 6 Sep 2016 21:45:05 +0200
Subject: [PATCH 1/2] Fix backport of "target-i386: add feature flags for
CPUID[EAX=0xd, ECX=1]"
RH-Author: Eduardo Habkost <ehabkost@redhat.com>
Message-id: <1473198305-8442-1-git-send-email-ehabkost@redhat.com>
Patchwork-id: 72260
O-Subject: [RHEL-7.3 qemu-kvm PATCH] Fix backport of "target-i386: add feature flags for CPUID[EAX=0xd, ECX=1]"
Bugzilla: 1371619
RH-Acked-by: Bandan Das <bsd@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
Upstream status: commit 0bb0b2d2fe7f645ddaf1f0ff40ac669c9feb4aa1
commit 5fcaf5176d7545518c76f3aa8ea7ce6fb063c62d (the backport of
upstream commit 0bb0b2d2fe7f645ddaf1f0ff40ac669c9feb4aa1) had a
serious bug: as the qemu-kvm-1.5.3 code doesn't have
FeatureWordInfo and loops for assigning cpu->features,
cpu->features[FEAT_XSAVE] was always zero, so that commit
basically cleared all XSAVE feature bits in all CPU models.
Fix it by handling FEAT_XSAVE everywhere it matters: in the
plus_features/minus_features handling, in the loading of CPU
model definition, and kvm_cpu_fill_host().
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
target-i386/cpu.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 80106ba..1001c47 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1201,6 +1201,8 @@ static void kvm_cpu_fill_host(x86_def_t *x86_cpu_def)
} else {
x86_cpu_def->features[FEAT_7_0_EBX] = 0;
}
+ x86_cpu_def->features[FEAT_XSAVE] =
+ kvm_arch_get_supported_cpuid(s, 0xd, 1, R_EAX);
x86_cpu_def->xlevel = kvm_arch_get_supported_cpuid(s, 0x80000000, 0, R_EAX);
x86_cpu_def->features[FEAT_8000_0001_EDX] =
@@ -1281,6 +1283,9 @@ static int kvm_check_features_against_host(X86CPU *cpu)
{&env->features[FEAT_7_0_EBX],
&host_def.features[FEAT_7_0_EBX],
FEAT_7_0_EBX },
+ {&env->features[FEAT_XSAVE],
+ &host_def.features[FEAT_XSAVE],
+ FEAT_XSAVE },
{&env->features[FEAT_SVM],
&host_def.features[FEAT_SVM],
FEAT_SVM },
@@ -1819,6 +1824,7 @@ static void cpu_x86_parse_featurestr(X86CPU *cpu, char *features, Error **errp)
env->features[FEAT_KVM] |= plus_features[FEAT_KVM];
env->features[FEAT_SVM] |= plus_features[FEAT_SVM];
env->features[FEAT_7_0_EBX] |= plus_features[FEAT_7_0_EBX];
+ env->features[FEAT_XSAVE] |= plus_features[FEAT_XSAVE];
env->features[FEAT_1_EDX] &= ~minus_features[FEAT_1_EDX];
env->features[FEAT_1_ECX] &= ~minus_features[FEAT_1_ECX];
env->features[FEAT_8000_0001_EDX] &= ~minus_features[FEAT_8000_0001_EDX];
@@ -1827,6 +1833,7 @@ static void cpu_x86_parse_featurestr(X86CPU *cpu, char *features, Error **errp)
env->features[FEAT_KVM] &= ~minus_features[FEAT_KVM];
env->features[FEAT_SVM] &= ~minus_features[FEAT_SVM];
env->features[FEAT_7_0_EBX] &= ~minus_features[FEAT_7_0_EBX];
+ env->features[FEAT_XSAVE] &= ~minus_features[FEAT_XSAVE];
out:
return;
@@ -1962,6 +1969,7 @@ static void cpu_x86_register(X86CPU *cpu, const char *name, Error **errp)
env->features[FEAT_SVM] = def->features[FEAT_SVM];
env->features[FEAT_C000_0001_EDX] = def->features[FEAT_C000_0001_EDX];
env->features[FEAT_7_0_EBX] = def->features[FEAT_7_0_EBX];
+ env->features[FEAT_XSAVE] = def->features[FEAT_XSAVE];
env->cpuid_xlevel2 = def->xlevel2;
object_property_set_str(OBJECT(cpu), def->model_id, "model-id", errp);
--
1.8.3.1