[libvirt] [PATCH 6/7] qemu: Report better host-model CPUs in domain caps
Jiri Denemark
jdenemar at redhat.com
Wed Mar 8 13:46:27 UTC 2017
One of the main reasons for introducing host-model CPU definition in a
domain capabilities XML was the inability to express disabled features
in a host capabilities XML. That is, when a host CPU is, e.g., Haswell
without x2apic support, host capabilities XML will have to report it as
Westmere + a bunch of additional features., but we really want to use
Haswell - x2apic when creating a host-model CPU.
Unfortunately, I somehow forgot to do the last step and the code would
just copy the CPU definition found in the host capabilities XML. This
changed recently for new QEMU versions which allow us to query host CPU,
but any slightly older QEMU will not benefit from any change I did. This
patch makes sure the right CPU model is filled in the domain
capabilities even with old QEMU.
The issue was reported in
https://bugzilla.redhat.com/show_bug.cgi?id=1426456
Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---
src/qemu/qemu_capabilities.c | 32 ++++++++++++++++++++++++++++----
src/qemu/qemu_capspriv.h | 5 +++++
tests/Makefile.am | 11 +++++++++--
tests/domaincapstest.c | 6 ++++++
tests/qemucpumock.c | 35 +++++++++++++++++++++++++++++++++++
tests/qemuxml2argvtest.c | 6 ++++--
6 files changed, 87 insertions(+), 8 deletions(-)
create mode 100644 tests/qemucpumock.c
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 08c66b088..70f9ed777 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -1074,6 +1074,26 @@ virQEMUCapsProbeHostCPU(virCapsPtr caps)
}
+virCPUDefPtr
+virQEMUCapsProbeHostCPUForEmulator(virCapsPtr caps,
+ virQEMUCapsPtr qemuCaps,
+ virDomainVirtType type)
+{
+ size_t nmodels;
+ char **models;
+ virCPUDefPtr cpu;
+
+ if (virQEMUCapsGetCPUDefinitions(qemuCaps, type, &models, &nmodels) < 0)
+ return NULL;
+
+ cpu = virCPUGetHost(caps->host.arch, VIR_CPU_TYPE_GUEST, NULL,
+ (const char **) models, nmodels);
+
+ virStringListFreeCount(models, nmodels);
+ return cpu;
+}
+
+
static int
virQEMUCapsInitPages(virCapsPtr caps)
{
@@ -3207,6 +3227,7 @@ virQEMUCapsInitHostCPUModel(virQEMUCapsPtr qemuCaps,
virDomainVirtType type)
{
virCPUDefPtr cpu = NULL;
+ virCPUDefPtr hostCPU = NULL;
int rc;
if (!caps || !virQEMUCapsGuestIsNative(caps->host.arch, qemuCaps->arch))
@@ -3223,11 +3244,11 @@ virQEMUCapsInitHostCPUModel(virQEMUCapsPtr qemuCaps,
if ((rc = virQEMUCapsInitCPUModel(qemuCaps, type, cpu)) < 0) {
goto error;
} else if (rc == 1) {
- VIR_DEBUG("No host CPU model info from QEMU; using host capabilities");
- if (!caps->host.cpu || !caps->host.cpu->model)
- goto error;
+ VIR_DEBUG("No host CPU model info from QEMU; probing host CPU directly");
- if (virCPUDefCopyModelFilter(cpu, caps->host.cpu, true,
+ hostCPU = virQEMUCapsProbeHostCPUForEmulator(caps, qemuCaps, type);
+ if (!hostCPU ||
+ virCPUDefCopyModelFilter(cpu, hostCPU, true,
virQEMUCapsCPUFilterFeatures,
qemuCaps) < 0)
goto error;
@@ -3238,11 +3259,14 @@ virQEMUCapsInitHostCPUModel(virQEMUCapsPtr qemuCaps,
else
qemuCaps->tcgCPUModel = cpu;
+ cleanup:
+ virCPUDefFree(hostCPU);
return;
error:
virCPUDefFree(cpu);
virResetLastError();
+ goto cleanup;
}
diff --git a/src/qemu/qemu_capspriv.h b/src/qemu/qemu_capspriv.h
index e0544f273..ee29b8bba 100644
--- a/src/qemu/qemu_capspriv.h
+++ b/src/qemu/qemu_capspriv.h
@@ -87,4 +87,9 @@ void
virQEMUCapsSetCPUModelInfo(virQEMUCapsPtr qemuCaps,
virDomainVirtType type,
qemuMonitorCPUModelInfoPtr modelInfo);
+
+virCPUDefPtr
+virQEMUCapsProbeHostCPUForEmulator(virCapsPtr caps,
+ virQEMUCapsPtr qemuCaps,
+ virDomainVirtType type);
#endif
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 35e82abf5..af69a3a84 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -284,6 +284,7 @@ test_libraries += libqemumonitortestutils.la \
qemuxml2xmlmock.la \
qemucaps2xmlmock.la \
qemucapsprobemock.la \
+ qemucpumock.la \
$(NULL)
endif WITH_QEMU
@@ -549,10 +550,16 @@ libqemutestdriver_la_SOURCES =
libqemutestdriver_la_LDFLAGS = $(QEMULIB_LDFLAGS)
libqemutestdriver_la_LIBADD = $(qemu_LDADDS)
+qemucpumock_la_SOURCES = \
+ qemucpumock.c
+qemucpumock_la_CFLAGS = $(AM_CFLAGS)
+qemucpumock_la_LDFLAGS = $(MOCKLIBS_LDFLAGS)
+qemucpumock_la_LIBADD = $(MOCKLIBS_LIBS)
+
qemuxml2argvtest_SOURCES = \
qemuxml2argvtest.c testutilsqemu.c testutilsqemu.h \
testutils.c testutils.h
-qemuxml2argvtest_LDADD = $(qemu_LDADDS) $(LDADDS) $(LIBXML_LIBS)
+qemuxml2argvtest_LDADD = libqemutestdriver.la $(LDADDS) $(LIBXML_LIBS)
qemuxml2argvmock_la_SOURCES = \
qemuxml2argvmock.c
@@ -949,7 +956,7 @@ domaincapstest_LDADD = $(LDADDS)
if WITH_QEMU
domaincapstest_SOURCES += testutilsqemu.c testutilsqemu.h
-domaincapstest_LDADD += $(qemu_LDADDS) $(GNULIB_LIBS)
+domaincapstest_LDADD += libqemutestdriver.la $(GNULIB_LIBS)
endif WITH_QEMU
if WITH_LIBXL
diff --git a/tests/domaincapstest.c b/tests/domaincapstest.c
index 9b64f2c18..a4bc8d6d0 100644
--- a/tests/domaincapstest.c
+++ b/tests/domaincapstest.c
@@ -491,4 +491,10 @@ mymain(void)
return ret;
}
+#if WITH_QEMU
+VIRT_TEST_MAIN_PRELOAD(mymain,
+ abs_builddir "/.libs/domaincapsmock.so",
+ abs_builddir "/.libs/qemucpumock.so")
+#else
VIRT_TEST_MAIN_PRELOAD(mymain, abs_builddir "/.libs/domaincapsmock.so")
+#endif
diff --git a/tests/qemucpumock.c b/tests/qemucpumock.c
new file mode 100644
index 000000000..2c1d24dd4
--- /dev/null
+++ b/tests/qemucpumock.c
@@ -0,0 +1,35 @@
+/*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+
+#include "internal.h"
+#include "qemu/qemu_capabilities.h"
+#define __QEMU_CAPSRIV_H_ALLOW__
+#include "qemu/qemu_capspriv.h"
+#undef __QEMU_CAPSRIV_H_ALLOW__
+
+
+virCPUDefPtr
+virQEMUCapsProbeHostCPUForEmulator(virCapsPtr caps,
+ virQEMUCapsPtr qemuCaps ATTRIBUTE_UNUSED,
+ virDomainVirtType type ATTRIBUTE_UNUSED)
+{
+ if (!caps || !caps->host.cpu || !caps->host.cpu->model)
+ return NULL;
+
+ return virCPUDefCopy(caps->host.cpu);
+}
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index d2d267fce..018b176c4 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -2476,8 +2476,10 @@ mymain(void)
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
-VIRT_TEST_MAIN_PRELOAD(mymain, abs_builddir "/.libs/qemuxml2argvmock.so",
- abs_builddir "/.libs/virrandommock.so")
+VIRT_TEST_MAIN_PRELOAD(mymain,
+ abs_builddir "/.libs/qemuxml2argvmock.so",
+ abs_builddir "/.libs/virrandommock.so",
+ abs_builddir "/.libs/qemucpumock.so")
#else
--
2.12.0
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