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i386/kvm: hv-stimer requires hv-time and hv-synic

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Synthetic timers operate in hv-time time and Windows won't use these
without SynIC.

Add .dependencies field to kvm_hyperv_properties[] and a generic mechanism
to check dependencies between features.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20190517141924.19024-7-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2019-05-17 16:19:21 +02:00 committed by Paolo Bonzini
parent e48ddcc6ce
commit c686193072
1 changed files with 19 additions and 4 deletions
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23
target/i386/kvm.c
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@ -689,6 +689,7 @@ static struct {
uint32_t fw;
uint32_t bits;
} flags[2];
uint64_t dependencies;
} kvm_hyperv_properties[] = {
[HYPERV_FEAT_RELAXED] = {
.desc = "relaxed timing (hv-relaxed)",
@ -756,7 +757,8 @@ static struct {
.flags = {
{.fw = FEAT_HYPERV_EAX,
.bits = HV_SYNTIMERS_AVAILABLE}
}
},
.dependencies = BIT(HYPERV_FEAT_SYNIC) | BIT(HYPERV_FEAT_TIME)
},
[HYPERV_FEAT_FREQUENCIES] = {
.desc = "frequency MSRs (hv-frequencies)",
@ -986,12 +988,25 @@ static int hv_cpuid_check_and_set(CPUState *cs, struct kvm_cpuid2 *cpuid,
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
uint32_t r, fw, bits;
int i;
uint64_t deps;
int i, dep_feat = 0;
if (!hyperv_feat_enabled(cpu, feature) && !cpu->hyperv_passthrough) {
return 0;
}
deps = kvm_hyperv_properties[feature].dependencies;
while ((dep_feat = find_next_bit(&deps, 64, dep_feat)) < 64) {
if (!(hyperv_feat_enabled(cpu, dep_feat))) {
fprintf(stderr,
"Hyper-V %s requires Hyper-V %s\n",
kvm_hyperv_properties[feature].desc,
kvm_hyperv_properties[dep_feat].desc);
return 1;
}
dep_feat++;
}
for (i = 0; i < ARRAY_SIZE(kvm_hyperv_properties[feature].flags); i++) {
fw = kvm_hyperv_properties[feature].flags[i].fw;
bits = kvm_hyperv_properties[feature].flags[i].bits;
@ -1107,11 +1122,11 @@ static int hyperv_handle_properties(CPUState *cs,
r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_EVMCS);
r |= hv_cpuid_check_and_set(cs, cpuid, HYPERV_FEAT_IPI);
/* Dependencies */
/* Additional dependencies not covered by kvm_hyperv_properties[] */
if (hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNIC) &&
!cpu->hyperv_synic_kvm_only &&
!hyperv_feat_enabled(cpu, HYPERV_FEAT_VPINDEX)) {
fprintf(stderr, "Hyper-V %s requires %s\n",
fprintf(stderr, "Hyper-V %s requires Hyper-V %s\n",
kvm_hyperv_properties[HYPERV_FEAT_SYNIC].desc,
kvm_hyperv_properties[HYPERV_FEAT_VPINDEX].desc);
r |= 1;