Qemu 3.1 supports Hyper-V-style PV IPIs making it cheaper for Windows
guests to send an IPI, especially when it targets many CPUs.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
docs/news.xml | 9 +++++++++
src/qemu/qemu_command.c | 2 +-
src/qemu/qemu_parse_command.c | 2 +-
src/qemu/qemu_process.c | 2 +-
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 +
9 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/docs/news.xml b/docs/news.xml
index 88774c55ae..c826380a92 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -35,6 +35,15 @@
<libvirt>
<release version="v4.10.0" date="unreleased">
<section title="New features">
+ <change>
+ <summary>
+ qemu: Add Hyper-V PV IPI support
+ </summary>
+ <description>
+ The QEMU driver now has support for Hyper-V PV IPI enlightenment
+ for Windows guests.
+ </description>
+ </change>
</section>
<section title="Improvements">
</section>
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index b4d3f1ee35..6fc8deff00 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6882,6 +6882,7 @@ qemuBuildCpuCommandLine(virCommandPtr cmd,
case VIR_DOMAIN_HYPERV_FREQUENCIES:
case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
case VIR_DOMAIN_HYPERV_TLBFLUSH:
+ case VIR_DOMAIN_HYPERV_IPI:
if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON)
virBufferAsprintf(&buf, ",hv_%s",
virDomainHypervTypeToString(i));
@@ -6899,7 +6900,6 @@ qemuBuildCpuCommandLine(virCommandPtr cmd,
def->hyperv_vendor_id);
break;
- case VIR_DOMAIN_HYPERV_IPI:
/* coverity[dead_error_begin] */
case VIR_DOMAIN_HYPERV_LAST:
break;
diff --git a/src/qemu/qemu_parse_command.c b/src/qemu/qemu_parse_command.c
index ab418432af..a15f4d1121 100644
--- a/src/qemu/qemu_parse_command.c
+++ b/src/qemu/qemu_parse_command.c
@@ -1539,6 +1539,7 @@ qemuParseCommandLineCPU(virDomainDefPtr dom,
case VIR_DOMAIN_HYPERV_FREQUENCIES:
case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
case VIR_DOMAIN_HYPERV_TLBFLUSH:
+ case VIR_DOMAIN_HYPERV_IPI:
if (value) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("HyperV feature '%s' should not "
@@ -1579,7 +1580,6 @@ qemuParseCommandLineCPU(virDomainDefPtr dom,
break;
- case VIR_DOMAIN_HYPERV_IPI:
case VIR_DOMAIN_HYPERV_LAST:
break;
}
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 3291d3f439..85e2f7046b 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3953,12 +3953,12 @@ qemuProcessVerifyHypervFeatures(virDomainDefPtr def,
case VIR_DOMAIN_HYPERV_FREQUENCIES:
case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
case VIR_DOMAIN_HYPERV_TLBFLUSH:
+ case VIR_DOMAIN_HYPERV_IPI:
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("host doesn't support hyperv '%s' feature"),
virDomainHypervTypeToString(i));
return -1;
- case VIR_DOMAIN_HYPERV_IPI:
/* coverity[dead_error_begin] */
case VIR_DOMAIN_HYPERV_VENDOR_ID:
case VIR_DOMAIN_HYPERV_LAST:
diff --git a/tests/qemuxml2argvdata/hyperv-off.xml b/tests/qemuxml2argvdata/hyperv-off.xml
index dc5777355f..e51cca45b5 100644
--- a/tests/qemuxml2argvdata/hyperv-off.xml
+++ b/tests/qemuxml2argvdata/hyperv-off.xml
@@ -23,6 +23,7 @@
<frequencies state='off'/>
<reenlightenment state='off'/>
<tlbflush state='off'/>
+ <ipi state='off'/>
</hyperv>
</features>
<clock offset='utc'/>
diff --git a/tests/qemuxml2argvdata/hyperv.args b/tests/qemuxml2argvdata/hyperv.args
index c55204b0c8..0800e4f79d 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_reenlightenment,hv_tlbflush,hv_ipi' \
-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 816adf6907..05c7d478f7 100644
--- a/tests/qemuxml2argvdata/hyperv.xml
+++ b/tests/qemuxml2argvdata/hyperv.xml
@@ -23,6 +23,7 @@
<frequencies state='on'/>
<reenlightenment state='on'/>
<tlbflush state='on'/>
+ <ipi state='on'/>
</hyperv>
</features>
<clock offset='utc'/>
diff --git a/tests/qemuxml2xmloutdata/hyperv-off.xml b/tests/qemuxml2xmloutdata/hyperv-off.xml
index 77a8dac810..2282b763b5 100644
--- a/tests/qemuxml2xmloutdata/hyperv-off.xml
+++ b/tests/qemuxml2xmloutdata/hyperv-off.xml
@@ -23,6 +23,7 @@
<frequencies state='off'/>
<reenlightenment state='off'/>
<tlbflush state='off'/>
+ <ipi state='off'/>
</hyperv>
</features>
<clock offset='utc'/>
diff --git a/tests/qemuxml2xmloutdata/hyperv.xml b/tests/qemuxml2xmloutdata/hyperv.xml
index fc8c59a557..97f387c172 100644
--- a/tests/qemuxml2xmloutdata/hyperv.xml
+++ b/tests/qemuxml2xmloutdata/hyperv.xml
@@ -23,6 +23,7 @@
<frequencies state='on'/>
<reenlightenment state='on'/>
<tlbflush state='on'/>
+ <ipi state='on'/>
</hyperv>
</features>
<clock offset='utc'/>
--
2.17.2
--
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