[libvirt] [PATCH] qemu: Refresh caps cache after booting a different kernel
Jiri Denemark
jdenemar at redhat.com
Mon Jan 22 10:46:14 UTC 2018
Whenever a different kernel is booted, some capabilities related to KVM
(such as CPUID bits) may change. We need to refresh the cache to see the
changes.
Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---
Notes:
The capabilities may also change if a parameter passed to a kvm module
changes (kvm_intel.nested is a good example) so this is not a complete
solution, but we're hopefully getting closer to it :-)
src/qemu/qemu_capabilities.c | 57 +++++++++++++++++++++++++++++++++++++-------
src/qemu/qemu_capspriv.h | 1 +
tests/qemucapsprobe.c | 2 +-
3 files changed, 50 insertions(+), 10 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index ab0ea8ec0d..2c573827f1 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -52,6 +52,7 @@
#include <unistd.h>
#include <sys/wait.h>
#include <stdarg.h>
+#include <sys/utsname.h>
#define VIR_FROM_THIS VIR_FROM_QEMU
@@ -510,6 +511,7 @@ struct _virQEMUCaps {
unsigned int libvirtVersion;
unsigned int microcodeVersion;
char *package;
+ char *kernelVersion;
virArch arch;
@@ -2303,6 +2305,9 @@ virQEMUCapsPtr virQEMUCapsNewCopy(virQEMUCapsPtr qemuCaps)
if (VIR_STRDUP(ret->package, qemuCaps->package) < 0)
goto error;
+ if (VIR_STRDUP(ret->kernelVersion, qemuCaps->kernelVersion) < 0)
+ goto error;
+
ret->arch = qemuCaps->arch;
if (qemuCaps->kvmCPUModels) {
@@ -2363,6 +2368,7 @@ void virQEMUCapsDispose(void *obj)
virBitmapFree(qemuCaps->flags);
VIR_FREE(qemuCaps->package);
+ VIR_FREE(qemuCaps->kernelVersion);
VIR_FREE(qemuCaps->binary);
VIR_FREE(qemuCaps->gicCapabilities);
@@ -3834,6 +3840,7 @@ struct _virQEMUCapsCachePriv {
gid_t runGid;
virArch hostArch;
unsigned int microcodeVersion;
+ char *kernelVersion;
};
typedef struct _virQEMUCapsCachePriv virQEMUCapsCachePriv;
typedef virQEMUCapsCachePriv *virQEMUCapsCachePrivPtr;
@@ -3845,6 +3852,7 @@ virQEMUCapsCachePrivFree(void *privData)
virQEMUCapsCachePrivPtr priv = privData;
VIR_FREE(priv->libDir);
+ VIR_FREE(priv->kernelVersion);
VIR_FREE(priv);
}
@@ -3970,6 +3978,12 @@ virQEMUCapsLoadCache(virArch hostArch,
goto cleanup;
}
+ if (virXPathBoolean("boolean(./kernelVersion)", ctxt) > 0) {
+ qemuCaps->kernelVersion = virXPathString("string(./kernelVersion)", ctxt);
+ if (!qemuCaps->kernelVersion)
+ goto cleanup;
+ }
+
if (!(str = virXPathString("string(./arch)", ctxt))) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("missing arch in QEMU capabilities cache"));
@@ -4248,6 +4262,10 @@ virQEMUCapsFormatCache(virQEMUCapsPtr qemuCaps)
virBufferAsprintf(&buf, "<package>%s</package>\n",
qemuCaps->package);
+ if (qemuCaps->kernelVersion)
+ virBufferAsprintf(&buf, "<kernelVersion>%s</kernelVersion>\n",
+ qemuCaps->kernelVersion);
+
virBufferAsprintf(&buf, "<arch>%s</arch>\n",
virArchToString(qemuCaps->arch));
@@ -4385,14 +4403,24 @@ virQEMUCapsIsValid(void *data,
return false;
}
- if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM) &&
- priv->microcodeVersion != qemuCaps->microcodeVersion) {
- VIR_DEBUG("Outdated capabilities for '%s': microcode version changed "
- "(%u vs %u)",
- qemuCaps->binary,
- priv->microcodeVersion,
- qemuCaps->microcodeVersion);
- return false;
+ if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM)) {
+ if (priv->microcodeVersion != qemuCaps->microcodeVersion) {
+ VIR_DEBUG("Outdated capabilities for '%s': microcode version "
+ "changed (%u vs %u)",
+ qemuCaps->binary,
+ priv->microcodeVersion,
+ qemuCaps->microcodeVersion);
+ return false;
+ }
+
+ if (STRNEQ_NULLABLE(priv->kernelVersion, qemuCaps->kernelVersion)) {
+ VIR_DEBUG("Outdated capabilities for '%s': kernel version changed "
+ "('%s' vs '%s')",
+ qemuCaps->binary,
+ priv->kernelVersion,
+ qemuCaps->kernelVersion);
+ return false;
+ }
}
return true;
@@ -5228,6 +5256,7 @@ virQEMUCapsNewForBinaryInternal(virArch hostArch,
uid_t runUid,
gid_t runGid,
unsigned int microcodeVersion,
+ const char *kernelVersion,
bool qmpOnly)
{
virQEMUCapsPtr qemuCaps;
@@ -5284,9 +5313,13 @@ virQEMUCapsNewForBinaryInternal(virArch hostArch,
virQEMUCapsInitHostCPUModel(qemuCaps, hostArch, VIR_DOMAIN_VIRT_KVM);
virQEMUCapsInitHostCPUModel(qemuCaps, hostArch, VIR_DOMAIN_VIRT_QEMU);
- if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM))
+ if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM)) {
qemuCaps->microcodeVersion = microcodeVersion;
+ if (VIR_STRDUP(qemuCaps->kernelVersion, kernelVersion) < 0)
+ goto error;
+ }
+
cleanup:
VIR_FREE(qmperr);
return qemuCaps;
@@ -5309,6 +5342,7 @@ virQEMUCapsNewData(const char *binary,
priv->runUid,
priv->runGid,
priv->microcodeVersion,
+ priv->kernelVersion,
false);
}
@@ -5397,6 +5431,7 @@ virQEMUCapsCacheNew(const char *libDir,
char *capsCacheDir = NULL;
virFileCachePtr cache = NULL;
virQEMUCapsCachePrivPtr priv = NULL;
+ struct utsname uts = { 0 };
if (virAsprintf(&capsCacheDir, "%s/capabilities", cacheDir) < 0)
goto error;
@@ -5417,6 +5452,10 @@ virQEMUCapsCacheNew(const char *libDir,
priv->runGid = runGid;
priv->microcodeVersion = microcodeVersion;
+ if (uname(&uts) == 0 &&
+ virAsprintf(&priv->kernelVersion, "%s %s", uts.release, uts.version) < 0)
+ goto error;
+
cleanup:
VIR_FREE(capsCacheDir);
return cache;
diff --git a/src/qemu/qemu_capspriv.h b/src/qemu/qemu_capspriv.h
index 98d163b920..222f3368e3 100644
--- a/src/qemu/qemu_capspriv.h
+++ b/src/qemu/qemu_capspriv.h
@@ -37,6 +37,7 @@ virQEMUCapsNewForBinaryInternal(virArch hostArch,
uid_t runUid,
gid_t runGid,
unsigned int microcodeVersion,
+ const char *kernelVersion,
bool qmpOnly);
int virQEMUCapsLoadCache(virArch hostArch,
diff --git a/tests/qemucapsprobe.c b/tests/qemucapsprobe.c
index a5f5a38b16..7d60246949 100644
--- a/tests/qemucapsprobe.c
+++ b/tests/qemucapsprobe.c
@@ -72,7 +72,7 @@ main(int argc, char **argv)
return EXIT_FAILURE;
if (!(caps = virQEMUCapsNewForBinaryInternal(VIR_ARCH_NONE, argv[1], "/tmp",
- -1, -1, 0, true)))
+ -1, -1, 0, NULL, true)))
return EXIT_FAILURE;
virObjectUnref(caps);
--
2.16.0
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