QEMU-4.1 supports 'Direct Mode' for Hyper-V synthetic timers
(hv-stimer-direct CPU flag): Windows guests can request that timer
expiration notifications are delivered as normal interrupts (and not
VMBus messages). This is used by Hyper-V on KVM.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
src/qemu/qemu_command.c | 22 ++++++++++++++--
src/qemu/qemu_process.c | 39 +++++++++++++++++++++++++++--
tests/qemuxml2argvdata/hyperv.args | 4 +--
tests/qemuxml2argvdata/hyperv.xml | 4 ++-
tests/qemuxml2xmloutdata/hyperv.xml | 4 ++-
5 files changed, 65 insertions(+), 8 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 1cf165079f..12229e879e 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7096,7 +7096,7 @@ qemuBuildCpuCommandLine(virCommandPtr cmd,
int ret = -1;
virBuffer cpu_buf = VIR_BUFFER_INITIALIZER;
virBuffer buf = VIR_BUFFER_INITIALIZER;
- size_t i;
+ size_t i, j;
if (def->cpu &&
(def->cpu->mode != VIR_CPU_MODE_CUSTOM || def->cpu->model)) {
@@ -7158,7 +7158,6 @@ qemuBuildCpuCommandLine(virCommandPtr cmd,
case VIR_DOMAIN_HYPERV_VPINDEX:
case VIR_DOMAIN_HYPERV_RUNTIME:
case VIR_DOMAIN_HYPERV_SYNIC:
- case VIR_DOMAIN_HYPERV_STIMER:
case VIR_DOMAIN_HYPERV_RESET:
case VIR_DOMAIN_HYPERV_FREQUENCIES:
case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
@@ -7170,6 +7169,25 @@ qemuBuildCpuCommandLine(virCommandPtr cmd,
virDomainHypervTypeToString(i));
break;
+ case VIR_DOMAIN_HYPERV_STIMER:
+ if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON)
+ virBufferAsprintf(&buf, ",hv_%s",
+ virDomainHypervTypeToString(i));
+ for (j = 0; j < VIR_DOMAIN_HYPERV_STIMER_LAST; j++) {
+ switch ((virDomainHypervStimer) j) {
+ case VIR_DOMAIN_HYPERV_STIMER_DIRECT:
+ if (def->hyperv_stimer_features[j] == VIR_TRISTATE_SWITCH_ON)
+ virBufferAsprintf(&buf, ",hv_stimer_%s",
+ virDomainHypervStimerTypeToString(j));
+ break;
+
+ /* coverity[dead_error_begin] */
+ case VIR_DOMAIN_HYPERV_STIMER_LAST:
+ break;
+ }
+ }
+ break;
+
case VIR_DOMAIN_HYPERV_SPINLOCKS:
if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON)
virBufferAsprintf(&buf, ",hv_spinlocks=0x%x",
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 75205bc121..0235cfd022 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -4111,10 +4111,45 @@ qemuProcessVerifyHypervFeatures(virDomainDefPtr def,
rc = virCPUDataCheckFeature(cpu, cpuFeature);
VIR_FREE(cpuFeature);
- if (rc < 0)
+ if (rc < 0) {
return -1;
- else if (rc == 1)
+ } else if (rc == 1) {
+ if ((i == VIR_DOMAIN_HYPERV_STIMER)) {
+ size_t j;
+
+ for (j = 0; j < VIR_DOMAIN_HYPERV_STIMER_LAST; j++) {
+ switch ((virDomainHypervStimer) j) {
+ case VIR_DOMAIN_HYPERV_STIMER_DIRECT:
+ if (def->hyperv_stimer_features[j] != VIR_TRISTATE_SWITCH_ON)
+ continue;
+
+ if (virAsprintf(&cpuFeature, "__kvm_hv_stimer_%s",
+ virDomainHypervStimerTypeToString(j)) < 0)
+ return -1;
+
+ rc = virCPUDataCheckFeature(cpu, cpuFeature);
+ VIR_FREE(cpuFeature);
+
+ if (rc < 0)
+ return -1;
+ else if (rc == 1)
+ continue;
+
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("host doesn't support hyperv stimer '%s' feature"),
+ virDomainHypervStimerTypeToString(i));
+ return -1;
+
+ /* coverity[dead_error_begin] */
+ case VIR_DOMAIN_HYPERV_STIMER_LAST:
+ break;
+ }
+ }
+
+ }
+
continue;
+ }
switch ((virDomainHyperv) i) {
case VIR_DOMAIN_HYPERV_RELAXED:
diff --git a/tests/qemuxml2argvdata/hyperv.args b/tests/qemuxml2argvdata/hyperv.args
index c557b6d8fe..a8f47ebb21 100644
--- a/tests/qemuxml2argvdata/hyperv.args
+++ b/tests/qemuxml2argvdata/hyperv.args
@@ -12,8 +12,8 @@ QEMU_AUDIO_DRV=none \
-S \
-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_evmcs' \
+hv_synic,hv_stimer,hv_stimer_direct,hv_reset,hv_vendor_id=KVM Hv,\
+hv_frequencies,hv_reenlightenment,hv_tlbflush,hv_ipi,hv_evmcs' \
-m 214 \
-realtime mlock=off \
-smp 6,sockets=6,cores=1,threads=1 \
diff --git a/tests/qemuxml2argvdata/hyperv.xml b/tests/qemuxml2argvdata/hyperv.xml
index c6feaed528..ae0f934f76 100644
--- a/tests/qemuxml2argvdata/hyperv.xml
+++ b/tests/qemuxml2argvdata/hyperv.xml
@@ -17,7 +17,9 @@
<vpindex state='on'/>
<runtime state='on'/>
<synic state='on'/>
- <stimer state='on'/>
+ <stimer state='on'>
+ <direct state='on'/>
+ </stimer>
<reset state='on'/>
<vendor_id state='on' value='KVM Hv'/>
<frequencies state='on'/>
diff --git a/tests/qemuxml2xmloutdata/hyperv.xml b/tests/qemuxml2xmloutdata/hyperv.xml
index 5510d3dfad..2e4b43d4c6 100644
--- a/tests/qemuxml2xmloutdata/hyperv.xml
+++ b/tests/qemuxml2xmloutdata/hyperv.xml
@@ -17,7 +17,9 @@
<vpindex state='on'/>
<runtime state='on'/>
<synic state='on'/>
- <stimer state='on'/>
+ <stimer state='on'>
+ <direct state='on'/>
+ </stimer>
<reset state='on'/>
<vendor_id state='on' value='KVM Hv'/>
<frequencies state='on'/>
--
2.20.1
--
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