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libvirt/0013-qemu-Pass-migratable-h...

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From: Jiri Denemark <jdenemar@redhat.com>
Date: Wed, 29 Mar 2017 15:31:17 +0200
Subject: [PATCH] qemu: Pass migratable host CPU model to virCPUUpdate
We already know from QEMU which CPU features will block migration. Let's
use this information to make a migratable copy of the host CPU model and
use it for updating guest CPU specification. This will allow us to drop
feature filtering from virCPUUpdate where it was just a hack.
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
(cherry picked from commit 56bd7edcb5dc878beffb80d4e6a9cfb812378ded)
---
src/qemu/qemu_capabilities.c | 57 +++++++++++++++++++++++++++++++++++++-------
src/qemu/qemu_capabilities.h | 2 ++
src/qemu/qemu_process.c | 2 +-
tests/cputest.c | 7 +++++-
4 files changed, 57 insertions(+), 11 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index a6324a398..7fc577546 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -384,6 +384,8 @@ struct _virQEMUCapsHostCPUData {
qemuMonitorCPUModelInfoPtr info;
/* Host CPU definition reported in domain capabilities. */
virCPUDefPtr reported;
+ /* Migratable host CPU definition used for updating guest CPU. */
+ virCPUDefPtr migratable;
};
/*
@@ -2100,6 +2102,10 @@ virQEMUCapsHostCPUDataCopy(virQEMUCapsHostCPUDataPtr dst,
!(dst->reported = virCPUDefCopy(src->reported)))
return -1;
+ if (src->migratable &&
+ !(dst->migratable = virCPUDefCopy(src->migratable)))
+ return -1;
+
return 0;
}
@@ -2109,6 +2115,7 @@ virQEMUCapsHostCPUDataClear(virQEMUCapsHostCPUDataPtr cpuData)
{
qemuMonitorCPUModelInfoFree(cpuData->info);
virCPUDefFree(cpuData->reported);
+ virCPUDefFree(cpuData->migratable);
memset(cpuData, 0, sizeof(*cpuData));
}
@@ -2447,6 +2454,9 @@ virQEMUCapsGetHostModel(virQEMUCapsPtr qemuCaps,
switch (cpuType) {
case VIR_QEMU_CAPS_HOST_CPU_REPORTED:
return cpuData->reported;
+
+ case VIR_QEMU_CAPS_HOST_CPU_MIGRATABLE:
+ return cpuData->migratable;
}
return NULL;
@@ -2456,11 +2466,13 @@ virQEMUCapsGetHostModel(virQEMUCapsPtr qemuCaps,
static void
virQEMUCapsSetHostModel(virQEMUCapsPtr qemuCaps,
virDomainVirtType type,
- virCPUDefPtr cpu)
+ virCPUDefPtr reported,
+ virCPUDefPtr migratable)
{
virQEMUCapsHostCPUDataPtr cpuData = virQEMUCapsGetHostCPUData(qemuCaps, type);
- cpuData->reported = cpu;
+ cpuData->reported = reported;
+ cpuData->migratable = migratable;
}
@@ -3307,26 +3319,39 @@ virQEMUCapsInitCPUModel(virQEMUCapsPtr qemuCaps,
}
+static virCPUDefPtr
+virQEMUCapsNewHostCPUModel(void)
+{
+ virCPUDefPtr cpu;
+
+ if (VIR_ALLOC(cpu) < 0)
+ return NULL;
+
+ cpu->type = VIR_CPU_TYPE_GUEST;
+ cpu->mode = VIR_CPU_MODE_CUSTOM;
+ cpu->match = VIR_CPU_MATCH_EXACT;
+ cpu->fallback = VIR_CPU_FALLBACK_ALLOW;
+
+ return cpu;
+}
+
+
void
virQEMUCapsInitHostCPUModel(virQEMUCapsPtr qemuCaps,
virCapsPtr caps,
virDomainVirtType type)
{
virCPUDefPtr cpu = NULL;
+ virCPUDefPtr migCPU = NULL;
virCPUDefPtr hostCPU = NULL;
int rc;
if (!caps || !virQEMUCapsGuestIsNative(caps->host.arch, qemuCaps->arch))
return;
- if (VIR_ALLOC(cpu) < 0)
+ if (!(cpu = virQEMUCapsNewHostCPUModel()))
goto error;
- cpu->type = VIR_CPU_TYPE_GUEST;
- cpu->mode = VIR_CPU_MODE_CUSTOM;
- cpu->match = VIR_CPU_MATCH_EXACT;
- cpu->fallback = VIR_CPU_FALLBACK_ALLOW;
-
if ((rc = virQEMUCapsInitCPUModel(qemuCaps, type, cpu, false)) < 0) {
goto error;
} else if (rc == 1) {
@@ -3340,7 +3365,20 @@ virQEMUCapsInitHostCPUModel(virQEMUCapsPtr qemuCaps,
goto error;
}
- virQEMUCapsSetHostModel(qemuCaps, type, cpu);
+ if (!(migCPU = virQEMUCapsNewHostCPUModel()))
+ goto error;
+
+ if ((rc = virQEMUCapsInitCPUModel(qemuCaps, type, migCPU, true)) < 0) {
+ goto error;
+ } else if (rc == 1) {
+ VIR_DEBUG("CPU migratability not provided by QEMU");
+
+ virCPUDefFree(migCPU);
+ if (!(migCPU = virCPUCopyMigratable(qemuCaps->arch, cpu)))
+ goto error;
+ }
+
+ virQEMUCapsSetHostModel(qemuCaps, type, cpu, migCPU);
cleanup:
virCPUDefFree(hostCPU);
@@ -3348,6 +3386,7 @@ virQEMUCapsInitHostCPUModel(virQEMUCapsPtr qemuCaps,
error:
virCPUDefFree(cpu);
+ virCPUDefFree(migCPU);
virResetLastError();
goto cleanup;
}
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 88e27855b..31818c940 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -453,6 +453,8 @@ int virQEMUCapsGetCPUDefinitions(virQEMUCapsPtr qemuCaps,
typedef enum {
/* Host CPU definition reported in domain capabilities. */
VIR_QEMU_CAPS_HOST_CPU_REPORTED,
+ /* Migratable host CPU definition used for updating guest CPU. */
+ VIR_QEMU_CAPS_HOST_CPU_MIGRATABLE,
} virQEMUCapsHostCPUType;
virCPUDefPtr virQEMUCapsGetHostModel(virQEMUCapsPtr qemuCaps,
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 07a88a3a7..e67736638 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -5306,7 +5306,7 @@ qemuProcessUpdateGuestCPU(virDomainDefPtr def,
if (virCPUUpdate(def->os.arch, def->cpu,
virQEMUCapsGetHostModel(qemuCaps, def->virtType,
- VIR_QEMU_CAPS_HOST_CPU_REPORTED)) < 0)
+ VIR_QEMU_CAPS_HOST_CPU_MIGRATABLE)) < 0)
goto cleanup;
if (virQEMUCapsGetCPUDefinitions(qemuCaps, def->virtType,
diff --git a/tests/cputest.c b/tests/cputest.c
index 8c07cf4f6..efa891dc1 100644
--- a/tests/cputest.c
+++ b/tests/cputest.c
@@ -393,6 +393,7 @@ cpuTestUpdate(const void *arg)
const struct data *data = arg;
int ret = -1;
virCPUDefPtr host = NULL;
+ virCPUDefPtr migHost = NULL;
virCPUDefPtr cpu = NULL;
char *result = NULL;
@@ -400,7 +401,10 @@ cpuTestUpdate(const void *arg)
!(cpu = cpuTestLoadXML(data->arch, data->name)))
goto cleanup;
- if (virCPUUpdate(host->arch, cpu, host) < 0)
+ if (!(migHost = virCPUCopyMigratable(data->arch, host)))
+ goto cleanup;
+
+ if (virCPUUpdate(host->arch, cpu, migHost) < 0)
goto cleanup;
if (virAsprintf(&result, "%s+%s", data->host, data->name) < 0)
@@ -411,6 +415,7 @@ cpuTestUpdate(const void *arg)
cleanup:
virCPUDefFree(host);
virCPUDefFree(cpu);
+ virCPUDefFree(migHost);
VIR_FREE(result);
return ret;
}
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