From: Vitaly Kuznetsov <vkuzn...@redhat.com>
The intention is to call hyperv_expand_features() early, before vCPUs
are created and use the acquired data later when we set guest visible
CPUID data.
Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
Reviewed-by: Eduardo Habkost <ehabk...@redhat.com>
Message-Id: <20210422161130.652779-10-vkuzn...@redhat.com>
Signed-off-by: Eduardo Habkost <ehabk...@redhat.com>
---
target/i386/kvm/kvm.c | 34 ++++++++++++++++++++++++----------
1 file changed, 24 insertions(+), 10 deletions(-)
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 2dd60fcaacf..10c836a2bf1 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -1187,16 +1187,15 @@ static uint32_t hv_build_cpuid_leaf(CPUState *cs,
uint32_t func, int reg)
}
/*
- * Fill in Hyper-V CPUIDs. Returns the number of entries filled in cpuid_ent in
- * case of success, errno < 0 in case of failure and 0 when no Hyper-V
- * extentions are enabled.
+ * Expand Hyper-V CPU features. In partucular, check that all the requested
+ * features are supported by the host and the sanity of the configuration
+ * (that all the required dependencies are included). Also, this takes care
+ * of 'hv_passthrough' mode and fills the environment with all supported
+ * Hyper-V features.
*/
-static int hyperv_handle_properties(CPUState *cs,
- struct kvm_cpuid_entry2 *cpuid_ent)
+static int hyperv_expand_features(CPUState *cs)
{
X86CPU *cpu = X86_CPU(cs);
- struct kvm_cpuid_entry2 *c;
- uint32_t cpuid_i = 0;
int r;
if (!hyperv_enabled(cpu))
@@ -1295,6 +1294,19 @@ static int hyperv_handle_properties(CPUState *cs,
return -ENOSYS;
}
+ return 0;
+}
+
+/*
+ * Fill in Hyper-V CPUIDs. Returns the number of entries filled in cpuid_ent.
+ */
+static int hyperv_fill_cpuids(CPUState *cs,
+ struct kvm_cpuid_entry2 *cpuid_ent)
+{
+ X86CPU *cpu = X86_CPU(cs);
+ struct kvm_cpuid_entry2 *c;
+ uint32_t cpuid_i = 0;
+
c = &cpuid_ent[cpuid_i++];
c->function = HV_CPUID_VENDOR_AND_MAX_FUNCTIONS;
c->eax = hyperv_feat_enabled(cpu, HYPERV_FEAT_EVMCS) ?
@@ -1502,11 +1514,13 @@ int kvm_arch_init_vcpu(CPUState *cs)
env->apic_bus_freq = KVM_APIC_BUS_FREQUENCY;
/* Paravirtualization CPUIDs */
- r = hyperv_handle_properties(cs, cpuid_data.entries);
+ r = hyperv_expand_features(cs);
if (r < 0) {
return r;
- } else if (r > 0) {
- cpuid_i = r;
+ }
+
+ if (hyperv_enabled(cpu)) {
+ cpuid_i = hyperv_fill_cpuids(cs, cpuid_data.entries);
kvm_base = KVM_CPUID_SIGNATURE_NEXT;
has_msr_hv_hypercall = true;
}
--
2.30.2
