[PATCH 2/2] conf: qemu: add support for Hyper-V Enlightened VMCS

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Qemu-3.1 supports Hyper-V Enlightened VMCS feature which significantly
speeds up nested Hyper-V on KVM environments.

Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
 docs/formatdomain.html.in               | 7 +++++++
 docs/schemas/domaincommon.rng           | 5 +++++
 src/conf/domain_conf.c                  | 6 +++++-
 src/conf/domain_conf.h                  | 1 +
 src/cpu/cpu_x86.c                       | 3 +++
 src/cpu/cpu_x86_data.h                  | 1 +
 src/qemu/qemu_command.c                 | 1 +
 src/qemu/qemu_parse_command.c           | 1 +
 src/qemu/qemu_process.c                 | 1 +
 tests/qemuxml2argvdata/hyperv-off.xml   | 1 +
 tests/qemuxml2argvdata/hyperv.args      | 2 +-
 tests/qemuxml2argvdata/hyperv.xml       | 1 +
 tests/qemuxml2xmloutdata/hyperv-off.xml | 1 +
 tests/qemuxml2xmloutdata/hyperv.xml     | 1 +
 14 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 24d4b68d7b..ad58f3f1c7 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1982,6 +1982,7 @@
     &lt;reenlightenment state='on'/&gt;
     &lt;tlbflush state='on'/&gt;
     &lt;ipi state='on'/&gt;
+    &lt;evmcs state='on'/&gt;
   &lt;/hyperv&gt;
   &lt;kvm&gt;
     &lt;hidden state='on'/&gt;
@@ -2128,6 +2129,12 @@
           <td> on, off</td>
           <td><span class="since">4.10.0 (QEMU 3.1)</span></td>
         </tr>
+        <tr>
+          <td>evmcs</td>
+          <td>Enable Enlightened VMCS</td>
+          <td> on, off</td>
+          <td><span class="since">4.10.0 (QEMU 3.1)</span></td>
+        </tr>
       </table>
       </dd>
       <dt><code>pvspinlock</code></dt>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 26019b3279..ff57ce1015 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5774,6 +5774,11 @@
             <ref name="featurestate"/>
           </element>
         </optional>
+        <optional>
+          <element name="evmcs">
+            <ref name="featurestate"/>
+          </element>
+        </optional>
       </interleave>
     </element>
   </define>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index c8cde90808..b0bb162d46 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -173,7 +173,8 @@ VIR_ENUM_IMPL(virDomainHyperv, VIR_DOMAIN_HYPERV_LAST,
               "frequencies",
               "reenlightenment",
               "tlbflush",
-              "ipi")
+              "ipi",
+              "evmcs")
 
 VIR_ENUM_IMPL(virDomainKVM, VIR_DOMAIN_KVM_LAST,
               "hidden")
@@ -19992,6 +19993,7 @@ virDomainDefParseXML(xmlDocPtr xml,
             case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
             case VIR_DOMAIN_HYPERV_TLBFLUSH:
             case VIR_DOMAIN_HYPERV_IPI:
+            case VIR_DOMAIN_HYPERV_EVMCS:
                 break;
 
             case VIR_DOMAIN_HYPERV_SPINLOCKS:
@@ -22187,6 +22189,7 @@ virDomainDefFeaturesCheckABIStability(virDomainDefPtr src,
             case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
             case VIR_DOMAIN_HYPERV_TLBFLUSH:
             case VIR_DOMAIN_HYPERV_IPI:
+            case VIR_DOMAIN_HYPERV_EVMCS:
                 if (src->hyperv_features[i] != dst->hyperv_features[i]) {
                     virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                                    _("State of HyperV enlightenment "
@@ -27952,6 +27955,7 @@ virDomainDefFormatInternal(virDomainDefPtr def,
                     case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
                     case VIR_DOMAIN_HYPERV_TLBFLUSH:
                     case VIR_DOMAIN_HYPERV_IPI:
+                    case VIR_DOMAIN_HYPERV_EVMCS:
                         break;
 
                     case VIR_DOMAIN_HYPERV_SPINLOCKS:
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 9eea75548d..061185e779 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1796,6 +1796,7 @@ typedef enum {
     VIR_DOMAIN_HYPERV_REENLIGHTENMENT,
     VIR_DOMAIN_HYPERV_TLBFLUSH,
     VIR_DOMAIN_HYPERV_IPI,
+    VIR_DOMAIN_HYPERV_EVMCS,
 
     VIR_DOMAIN_HYPERV_LAST
 } virDomainHyperv;
diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index 33252e927e..ebfa74fccd 100644
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -116,6 +116,8 @@ KVM_FEATURE_DEF(VIR_CPU_x86_KVM_HV_TLBFLUSH,
                 0x40000004, 0x00000004);
 KVM_FEATURE_DEF(VIR_CPU_x86_KVM_HV_IPI,
                 0x40000004, 0x00000400);
+KVM_FEATURE_DEF(VIR_CPU_x86_KVM_HV_EVMCS,
+                0x40000004, 0x00004000);
 
 static virCPUx86Feature x86_kvm_features[] =
 {
@@ -140,6 +142,7 @@ static virCPUx86Feature x86_kvm_features[] =
     KVM_FEATURE(VIR_CPU_x86_KVM_HV_REENLIGHTENMENT),
     KVM_FEATURE(VIR_CPU_x86_KVM_HV_TLBFLUSH),
     KVM_FEATURE(VIR_CPU_x86_KVM_HV_IPI),
+    KVM_FEATURE(VIR_CPU_x86_KVM_HV_EVMCS),
 };
 
 typedef struct _virCPUx86Model virCPUx86Model;
diff --git a/src/cpu/cpu_x86_data.h b/src/cpu/cpu_x86_data.h
index 8c51d88e1a..f52bba821f 100644
--- a/src/cpu/cpu_x86_data.h
+++ b/src/cpu/cpu_x86_data.h
@@ -66,6 +66,7 @@ struct _virCPUx86CPUID {
 # define VIR_CPU_x86_KVM_HV_REENLIGHTENMENT "__kvm_hv_reenlightenment"
 # define VIR_CPU_x86_KVM_HV_TLBFLUSH  "__kvm_hv_tlbflush"
 # define VIR_CPU_x86_KVM_HV_IPI       "__kvm_hv_ipi"
+# define VIR_CPU_x86_KVM_HV_EVMCS     "__kvm_hv_evmcs"
 
 
 # define VIR_CPU_X86_DATA_INIT { 0 }
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 6fc8deff00..d543ada2a1 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6883,6 +6883,7 @@ qemuBuildCpuCommandLine(virCommandPtr cmd,
             case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
             case VIR_DOMAIN_HYPERV_TLBFLUSH:
             case VIR_DOMAIN_HYPERV_IPI:
+            case VIR_DOMAIN_HYPERV_EVMCS:
                 if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON)
                     virBufferAsprintf(&buf, ",hv_%s",
                                       virDomainHypervTypeToString(i));
diff --git a/src/qemu/qemu_parse_command.c b/src/qemu/qemu_parse_command.c
index a15f4d1121..d91fc8d901 100644
--- a/src/qemu/qemu_parse_command.c
+++ b/src/qemu/qemu_parse_command.c
@@ -1540,6 +1540,7 @@ qemuParseCommandLineCPU(virDomainDefPtr dom,
             case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
             case VIR_DOMAIN_HYPERV_TLBFLUSH:
             case VIR_DOMAIN_HYPERV_IPI:
+            case VIR_DOMAIN_HYPERV_EVMCS:
                 if (value) {
                     virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                                    _("HyperV feature '%s' should not "
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 85e2f7046b..ebe8e244ae 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3954,6 +3954,7 @@ qemuProcessVerifyHypervFeatures(virDomainDefPtr def,
         case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
         case VIR_DOMAIN_HYPERV_TLBFLUSH:
         case VIR_DOMAIN_HYPERV_IPI:
+        case VIR_DOMAIN_HYPERV_EVMCS:
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                            _("host doesn't support hyperv '%s' feature"),
                            virDomainHypervTypeToString(i));
diff --git a/tests/qemuxml2argvdata/hyperv-off.xml b/tests/qemuxml2argvdata/hyperv-off.xml
index e51cca45b5..59c1e17ccd 100644
--- a/tests/qemuxml2argvdata/hyperv-off.xml
+++ b/tests/qemuxml2argvdata/hyperv-off.xml
@@ -24,6 +24,7 @@
       <reenlightenment state='off'/>
       <tlbflush state='off'/>
       <ipi state='off'/>
+      <evmcs state='off'/>
     </hyperv>
   </features>
   <clock offset='utc'/>
diff --git a/tests/qemuxml2argvdata/hyperv.args b/tests/qemuxml2argvdata/hyperv.args
index 0800e4f79d..5d59788e14 100644
--- a/tests/qemuxml2argvdata/hyperv.args
+++ b/tests/qemuxml2argvdata/hyperv.args
@@ -10,7 +10,7 @@ QEMU_AUDIO_DRV=none \
 -machine pc,accel=tcg,usb=off,dump-guest-core=off \
 -cpu 'qemu32,hv_relaxed,hv_vapic,hv_spinlocks=0x2fff,hv_vpindex,hv_runtime,\
 hv_synic,hv_stimer,hv_reset,hv_vendor_id=KVM Hv,hv_frequencies,\
-hv_reenlightenment,hv_tlbflush,hv_ipi' \
+hv_reenlightenment,hv_tlbflush,hv_ipi,hv_evmcs' \
 -m 214 \
 -smp 6,sockets=6,cores=1,threads=1 \
 -uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
diff --git a/tests/qemuxml2argvdata/hyperv.xml b/tests/qemuxml2argvdata/hyperv.xml
index 05c7d478f7..c6feaed528 100644
--- a/tests/qemuxml2argvdata/hyperv.xml
+++ b/tests/qemuxml2argvdata/hyperv.xml
@@ -24,6 +24,7 @@
       <reenlightenment state='on'/>
       <tlbflush state='on'/>
       <ipi state='on'/>
+      <evmcs state='on'/>
     </hyperv>
   </features>
   <clock offset='utc'/>
diff --git a/tests/qemuxml2xmloutdata/hyperv-off.xml b/tests/qemuxml2xmloutdata/hyperv-off.xml
index 2282b763b5..1b7d82b14a 100644
--- a/tests/qemuxml2xmloutdata/hyperv-off.xml
+++ b/tests/qemuxml2xmloutdata/hyperv-off.xml
@@ -24,6 +24,7 @@
       <reenlightenment state='off'/>
       <tlbflush state='off'/>
       <ipi state='off'/>
+      <evmcs state='off'/>
     </hyperv>
   </features>
   <clock offset='utc'/>
diff --git a/tests/qemuxml2xmloutdata/hyperv.xml b/tests/qemuxml2xmloutdata/hyperv.xml
index 97f387c172..5510d3dfad 100644
--- a/tests/qemuxml2xmloutdata/hyperv.xml
+++ b/tests/qemuxml2xmloutdata/hyperv.xml
@@ -24,6 +24,7 @@
       <reenlightenment state='on'/>
       <tlbflush state='on'/>
       <ipi state='on'/>
+      <evmcs state='on'/>
     </hyperv>
   </features>
   <clock offset='utc'/>
-- 
2.17.2

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