8:03 p.m.
Convert CPU features policy into libxl cpuid policy settings. Use new
("libxl") syntax, which allow to enable/disable specific bits, using
host CPU as a base. For this reason, only "host-passthrough" mode is
accepted.
Libxl do not have distinction between "force" and "required" policy
(there is only "force") and also between "forbid" and
"disable" (there
is only "disable"). So, merge them appropriately. If anything,
"require"
and "forbid" should be enforced outside of specific driver.
Nested HVM (vmx and svm features) is handled separately, so exclude it
from translation.
Signed-off-by: Marek Marczykowski-Górecki <marmarek(a)invisiblethingslab.com>
Reviewed-by: Daniel P. Berrangé <berrange(a)redhat.com>
---
Changes since v4:
- added spec-ctrl/ibrsb
Changes since v2:
- drop spurious changes
- move libxlTranslateCPUFeature function to xen_xl.c, to be reused by
xenconfig driver
Changes since v1:
- use new ("libxl") syntax to set only bits explicitly mentioned in
domain XML
---
src/libxl/libxl_conf.c | 36 +++++++++++++++++++++++++++++++++---
src/xenconfig/xen_xl.c | 35 +++++++++++++++++++++++++++++++++++
src/xenconfig/xen_xl.h | 2 ++
3 files changed, 70 insertions(+), 3 deletions(-)
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 9ea3759..e98fe52 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -50,6 +50,7 @@
#include "secret_util.h"
#include "cpu/cpu.h"
#include "xen_common.h"
+#include "xen_xl.h"
#define VIR_FROM_THIS VIR_FROM_LIBXL
@@ -394,6 +395,7 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
def->cpu && def->cpu->mode ==
(VIR_CPU_MODE_HOST_PASSTHROUGH)) {
bool hasHwVirt = false;
bool svm = false, vmx = false;
+ char xlCPU[32];
/* enable nested HVM only if global nested_hvm option enable it and
* host support it*/
@@ -411,17 +413,45 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
case VIR_CPU_FEATURE_DISABLE:
case VIR_CPU_FEATURE_FORBID:
if ((vmx && STREQ(def->cpu->features[i].name,
"vmx")) ||
- (svm && STREQ(def->cpu->features[i].name,
"svm")))
+ (svm && STREQ(def->cpu->features[i].name,
"svm"))) {
hasHwVirt = false;
+ continue;
+ }
+
+ snprintf(xlCPU,
+ sizeof(xlCPU),
+ "%s=0",
+ xenTranslateCPUFeature(
+ def->cpu->features[i].name,
+ false));
+ if (libxl_cpuid_parse_config(&b_info->cpuid, xlCPU))
{
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("unsupported cpu feature
'%s'"),
+ def->cpu->features[i].name);
+ return -1;
+ }
break;
case VIR_CPU_FEATURE_FORCE:
case VIR_CPU_FEATURE_REQUIRE:
if ((vmx && STREQ(def->cpu->features[i].name,
"vmx")) ||
- (svm && STREQ(def->cpu->features[i].name,
"svm")))
+ (svm && STREQ(def->cpu->features[i].name,
"svm"))) {
hasHwVirt = true;
+ continue;
+ }
+
+ snprintf(xlCPU,
+ sizeof(xlCPU),
+ "%s=1",
+ xenTranslateCPUFeature(
+ def->cpu->features[i].name, false));
+ if (libxl_cpuid_parse_config(&b_info->cpuid, xlCPU))
{
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("unsupported cpu feature
'%s'"),
+ def->cpu->features[i].name);
+ return -1;
+ }
break;
-
case VIR_CPU_FEATURE_OPTIONAL:
case VIR_CPU_FEATURE_LAST:
break;
diff --git a/src/xenconfig/xen_xl.c b/src/xenconfig/xen_xl.c
index ea5cacb..f60ee08 100644
--- a/src/xenconfig/xen_xl.c
+++ b/src/xenconfig/xen_xl.c
@@ -218,6 +218,41 @@ xenParseXLOS(virConfPtr conf, virDomainDefPtr def, virCapsPtr caps)
return 0;
}
+/*
+ * Translate CPU feature name from libvirt to libxl (from_libxl=false) or from
+ * libxl to libvirt (from_libxl=true).
+ */
+const char *
+xenTranslateCPUFeature(const char *feature_name, bool from_libxl)
+{
+ static const char *translation_table[][2] = {
+ /* libvirt name, libxl name */
+ { "cx16", "cmpxchg16" },
+ { "cid", "cntxid" },
+ { "ds_cpl", "dscpl" },
+ { "pclmuldq", "pclmulqdq" },
+ { "pni", "sse3" },
+ { "ht", "htt" },
+ { "pn", "psn" },
+ { "clflush", "clfsh" },
+ { "sep", "sysenter" },
+ { "cx8", "cmpxchg8" },
+ { "nodeid_msr", "nodeid" },
+ { "cr8legacy", "altmovcr8" },
+ { "lahf_lm", "lahfsahf" },
+ { "cmp_legacy", "cmplegacy" },
+ { "fxsr_opt", "ffxsr" },
+ { "pdpe1gb", "page1gb" },
+ { "spec-ctrl", "ibrsb" },
+ };
+ size_t i;
+
+ for (i = 0; i < ARRAY_CARDINALITY(translation_table); i++)
+ if (STREQ(translation_table[i][from_libxl], feature_name))
+ return translation_table[i][!from_libxl];
+ return feature_name;
+}
+
static int
xenParseXLSpice(virConfPtr conf, virDomainDefPtr def)
diff --git a/src/xenconfig/xen_xl.h b/src/xenconfig/xen_xl.h
index dd96326..68f332a 100644
--- a/src/xenconfig/xen_xl.h
+++ b/src/xenconfig/xen_xl.h
@@ -33,4 +33,6 @@ virDomainDefPtr xenParseXL(virConfPtr conn,
virConfPtr xenFormatXL(virDomainDefPtr def, virConnectPtr);
+const char *xenTranslateCPUFeature(const char *feature_name, bool from_libxl);
+
#endif /* __VIR_XEN_XL_H__ */
--
git-series 0.9.1