diff mbox series

[v6,09/19] i386: split hyperv_handle_properties() into hyperv_expand_features()/hyperv_fill_cpuids()

Message ID 20210422161130.652779-10-vkuznets@redhat.com (mailing list archive)
State New, archived
Headers show
Series i386: KVM: expand Hyper-V features early | expand

Commit Message

Vitaly Kuznetsov April 22, 2021, 4:11 p.m. UTC 
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 <vkuznets@redhat.com>
---
 target/i386/kvm/kvm.c | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

Comments

Eduardo Habkost May 20, 2021, 9:34 p.m. UTC | #1 
On Thu, Apr 22, 2021 at 06:11:20PM +0200, Vitaly Kuznetsov wrote:
> 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 <vkuznets@redhat.com>

Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
diff mbox series

Patch

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 3694c3f596e5..6b391db7a030 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -1186,16 +1186,15 @@  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))
@@ -1294,6 +1293,19 @@  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) ?
@@ -1501,11 +1513,13 @@  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;
     }