[PATCH 3/3] conf: qemu: add support for Hyper-V PV TLB flush

Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> · Thu, 9 Aug 2018 15:14:21 +0200

Qemu-3.0 supports Hyper-V-style PV TLB flush, Windows guests can benefit
from this feature as KVM knows which vCPUs are not currently scheduled (and
thus don't require any immediate action).

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 de0993696e..c37a4389dc 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1939,6 +1939,7 @@
     &lt;vendor_id state='on' value='KVM Hv'/&gt;
     &lt;frequencies state='on'/&gt;
     &lt;reenlightenment state='on'/&gt;
+    &lt;tlbflush state='on'/&gt;
   &lt;/hyperv&gt;
   &lt;kvm&gt;
     &lt;hidden state='on'/&gt;
@@ -2073,6 +2074,12 @@
           <td> on, off</td>
           <td><span class="since">4.7.0 (QEMU 3.0)</span></td>
         </tr>
+        <tr>
+          <td>tlbflush</td>
+          <td>Enable PV TLB flush support</td>
+          <td> on, off</td>
+          <td><span class="since">4.7.0 (QEMU 3.0)</span></td>
+        </tr>
       </table>
       </dd>
       <dt><code>pvspinlock</code></dt>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index b2a1ebfa3f..eab2618e51 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5726,6 +5726,11 @@
             <ref name="featurestate"/>
           </element>
         </optional>
+        <optional>
+          <element name="tlbflush">
+            <ref name="featurestate"/>
+          </element>
+        </optional>
       </interleave>
     </element>
   </define>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index e2154b5bf7..f32bbd760c 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -171,7 +171,8 @@ VIR_ENUM_IMPL(virDomainHyperv, VIR_DOMAIN_HYPERV_LAST,
               "reset",
               "vendor_id",
               "frequencies",
-              "reenlightenment")
+              "reenlightenment",
+              "tlbflush")
 
 VIR_ENUM_IMPL(virDomainKVM, VIR_DOMAIN_KVM_LAST,
               "hidden")
@@ -20021,6 +20022,7 @@ virDomainDefParseXML(xmlDocPtr xml,
             case VIR_DOMAIN_HYPERV_RESET:
             case VIR_DOMAIN_HYPERV_FREQUENCIES:
             case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
+            case VIR_DOMAIN_HYPERV_TLBFLUSH:
                 break;
 
             case VIR_DOMAIN_HYPERV_SPINLOCKS:
@@ -22207,6 +22209,7 @@ virDomainDefFeaturesCheckABIStability(virDomainDefPtr src,
             case VIR_DOMAIN_HYPERV_RESET:
             case VIR_DOMAIN_HYPERV_FREQUENCIES:
             case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
+            case VIR_DOMAIN_HYPERV_TLBFLUSH:
                 if (src->hyperv_features[i] != dst->hyperv_features[i]) {
                     virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                                    _("State of HyperV enlightenment "
@@ -27859,6 +27862,7 @@ virDomainDefFormatInternal(virDomainDefPtr def,
                     case VIR_DOMAIN_HYPERV_RESET:
                     case VIR_DOMAIN_HYPERV_FREQUENCIES:
                     case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
+                    case VIR_DOMAIN_HYPERV_TLBFLUSH:
                         break;
 
                     case VIR_DOMAIN_HYPERV_SPINLOCKS:
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 8fa5002985..1287e862fc 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1793,6 +1793,7 @@ typedef enum {
     VIR_DOMAIN_HYPERV_VENDOR_ID,
     VIR_DOMAIN_HYPERV_FREQUENCIES,
     VIR_DOMAIN_HYPERV_REENLIGHTENMENT,
+    VIR_DOMAIN_HYPERV_TLBFLUSH,
 
     VIR_DOMAIN_HYPERV_LAST
 } virDomainHyperv;
diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
index 7a48b78eb9..7fa84f6014 100644
--- a/src/cpu/cpu_x86.c
+++ b/src/cpu/cpu_x86.c
@@ -113,6 +113,8 @@ KVM_FEATURE_DEF(VIR_CPU_x86_KVM_HV_FREQUENCIES,
                 0x40000003, 0x00000800);
 KVM_FEATURE_DEF(VIR_CPU_x86_KVM_HV_REENLIGHTENMENT,
                 0x40000003, 0x00002000);
+KVM_FEATURE_DEF(VIR_CPU_x86_KVM_HV_TLBFLUSH,
+                0x40000004, 0x00000004);
 
 static virCPUx86Feature x86_kvm_features[] =
 {
@@ -135,6 +137,7 @@ static virCPUx86Feature x86_kvm_features[] =
     KVM_FEATURE(VIR_CPU_x86_KVM_HV_RESET),
     KVM_FEATURE(VIR_CPU_x86_KVM_HV_FREQUENCIES),
     KVM_FEATURE(VIR_CPU_x86_KVM_HV_REENLIGHTENMENT),
+    KVM_FEATURE(VIR_CPU_x86_KVM_HV_TLBFLUSH),
 };
 
 typedef struct _virCPUx86Model virCPUx86Model;
diff --git a/src/cpu/cpu_x86_data.h b/src/cpu/cpu_x86_data.h
index a810c64fc9..090a21156f 100644
--- a/src/cpu/cpu_x86_data.h
+++ b/src/cpu/cpu_x86_data.h
@@ -65,6 +65,7 @@ struct _virCPUx86CPUID {
 # define VIR_CPU_x86_KVM_HV_RESET     "__kvm_hv_reset"
 # define VIR_CPU_x86_KVM_HV_FREQUENCIES "__kvm_hv_frequencies"
 # define VIR_CPU_x86_KVM_HV_REENLIGHTENMENT "__kvm_hv_reenlightenment"
+# define VIR_CPU_x86_KVM_HV_TLBFLUSH  "__kvm_hv_tlbflush"
 
 
 # define VIR_CPU_X86_DATA_INIT { 0 }
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 17d4c0a359..f0b2553c5e 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6922,6 +6922,7 @@ qemuBuildCpuCommandLine(virCommandPtr cmd,
             case VIR_DOMAIN_HYPERV_RESET:
             case VIR_DOMAIN_HYPERV_FREQUENCIES:
             case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
+            case VIR_DOMAIN_HYPERV_TLBFLUSH:
                 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 1e67a5a8c8..fdc1d34068 100644
--- a/src/qemu/qemu_parse_command.c
+++ b/src/qemu/qemu_parse_command.c
@@ -1538,6 +1538,7 @@ qemuParseCommandLineCPU(virDomainDefPtr dom,
             case VIR_DOMAIN_HYPERV_RESET:
             case VIR_DOMAIN_HYPERV_FREQUENCIES:
             case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
+            case VIR_DOMAIN_HYPERV_TLBFLUSH:
                 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 e97628dd4a..19a7405d99 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3914,6 +3914,7 @@ qemuProcessVerifyHypervFeatures(virDomainDefPtr def,
         case VIR_DOMAIN_HYPERV_RESET:
         case VIR_DOMAIN_HYPERV_FREQUENCIES:
         case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
+        case VIR_DOMAIN_HYPERV_TLBFLUSH:
             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 b2e3612df9..dc5777355f 100644
--- a/tests/qemuxml2argvdata/hyperv-off.xml
+++ b/tests/qemuxml2argvdata/hyperv-off.xml
@@ -22,6 +22,7 @@
       <vendor_id state='off'/>
       <frequencies state='off'/>
       <reenlightenment state='off'/>
+      <tlbflush state='off'/>
     </hyperv>
   </features>
   <clock offset='utc'/>
diff --git a/tests/qemuxml2argvdata/hyperv.args b/tests/qemuxml2argvdata/hyperv.args
index 4feafad8e2..6ee6198fb0 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_reenlightenment,hv_tlbflush' \
 -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 20fcdba59e..816adf6907 100644
--- a/tests/qemuxml2argvdata/hyperv.xml
+++ b/tests/qemuxml2argvdata/hyperv.xml
@@ -22,6 +22,7 @@
       <vendor_id state='on' value='KVM Hv'/>
       <frequencies state='on'/>
       <reenlightenment state='on'/>
+      <tlbflush state='on'/>
     </hyperv>
   </features>
   <clock offset='utc'/>
diff --git a/tests/qemuxml2xmloutdata/hyperv-off.xml b/tests/qemuxml2xmloutdata/hyperv-off.xml
index 4a41e0c37e..77a8dac810 100644
--- a/tests/qemuxml2xmloutdata/hyperv-off.xml
+++ b/tests/qemuxml2xmloutdata/hyperv-off.xml
@@ -22,6 +22,7 @@
       <vendor_id state='off'/>
       <frequencies state='off'/>
       <reenlightenment state='off'/>
+      <tlbflush state='off'/>
     </hyperv>
   </features>
   <clock offset='utc'/>
diff --git a/tests/qemuxml2xmloutdata/hyperv.xml b/tests/qemuxml2xmloutdata/hyperv.xml
index 183b45980b..fc8c59a557 100644
--- a/tests/qemuxml2xmloutdata/hyperv.xml
+++ b/tests/qemuxml2xmloutdata/hyperv.xml
@@ -22,6 +22,7 @@
       <vendor_id state='on' value='KVM Hv'/>
       <frequencies state='on'/>
       <reenlightenment state='on'/>
+      <tlbflush state='on'/>
     </hyperv>
   </features>
   <clock offset='utc'/>
-- 
2.14.4

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