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From: Roman Bogorodskiy
To: libvir-list@redhat.com
Date: Fri, 25 Jan 2019 21:54:44 +0400
Message-Id: <20190125175446.12288-2-bogorodskiy@gmail.com>
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Subject: [libvirt] [PATCH 1/3] conf: introduce 'msrs' feature
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Introduce the 'msrs' feature element that controls Model Specific
Registers related behaviour. At this moment it allows only
single tunable attribute "ignoreUnknownWrites":
Which tells hypervisor to ignore accesses to unimplemented
Model Specific Registers. The only user of that for now is going
to be the bhyve driver.
Signed-off-by: Roman Bogorodskiy
---
docs/formatdomain.html.in | 1 +
docs/schemas/domaincommon.rng | 14 ++++++++++++++
src/conf/domain_conf.c | 33 +++++++++++++++++++++++++++++++++
src/conf/domain_conf.h | 8 ++++++++
src/qemu/qemu_domain.c | 1 +
5 files changed, 57 insertions(+)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 7f07bb7f55..b6496c63db 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -2010,6 +2010,7 @@
<tlbflush state=3D'on'/>
<ipi state=3D'on'/>
<evmcs state=3D'on'/>
+ <msrs ignoreUnknownWrites=3D'yes'/>
</hyperv>
<kvm>
<hidden state=3D'on'/>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index aa50eac424..e9dd99ab3a 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -4994,6 +4994,9 @@
[
+
+ ][
+ ]
@@ -5242,6 +5245,17 @@
=20
+
+
+
+
+ yes
+ no
+
+
+
+
+
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 22979e6c4e..c8ec3a9011 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -153,6 +153,7 @@ VIR_ENUM_IMPL(virDomainFeature, VIR_DOMAIN_FEATURE_LAST,
"vmcoreinfo",
"htm",
"nested-hv",
+ "msrs",
);
=20
VIR_ENUM_IMPL(virDomainCapabilitiesPolicy, VIR_DOMAIN_CAPABILITIES_POLICY_=
LAST,
@@ -20232,6 +20233,7 @@ virDomainDefParseXML(xmlDocPtr xml,
case VIR_DOMAIN_FEATURE_PRIVNET:
case VIR_DOMAIN_FEATURE_HYPERV:
case VIR_DOMAIN_FEATURE_KVM:
+ case VIR_DOMAIN_FEATURE_MSRS:
def->features[val] =3D VIR_TRISTATE_SWITCH_ON;
break;
=20
@@ -20520,6 +20522,26 @@ virDomainDefParseXML(xmlDocPtr xml,
def->tseg_specified =3D rv;
}
=20
+ if (def->features[VIR_DOMAIN_FEATURE_MSRS] =3D=3D VIR_TRISTATE_SWITCH_=
ON) {
+ if ((node =3D virXPathNode("./features/msrs", ctxt)) =3D=3D NULL)
+ goto error;
+
+ if (!(tmp =3D virXMLPropString(node, "ignoreUnknownWrites"))) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("missing ignoreUnknownWrites attribute for fe=
ature '%s'"),
+ virDomainFeatureTypeToString(VIR_DOMAIN_FEATURE=
_MSRS));
+ goto error;
+ }
+
+ if ((def->msrs_features[VIR_DOMAIN_MSRS_IGNORE_UNKNOWN_WRITES] =3D=
virTristateBoolTypeFromString(tmp)) <=3D 0) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("unknown ignoreUnknownWrites value '%s'"),
+ tmp);
+ goto error;
+ }
+ VIR_FREE(tmp);
+ }
+
if ((n =3D virXPathNodeSet("./features/capabilities/*", ctxt, &nodes))=
< 0)
goto error;
=20
@@ -22582,6 +22604,9 @@ virDomainDefFeaturesCheckABIStability(virDomainDefP=
tr src,
}
break;
=20
+ case VIR_DOMAIN_FEATURE_MSRS:
+ break;
+
case VIR_DOMAIN_FEATURE_LAST:
break;
}
@@ -28647,6 +28672,14 @@ virDomainDefFormatInternal(virDomainDefPtr def,
}
break;
=20
+ case VIR_DOMAIN_FEATURE_MSRS:
+ if (def->features[i] !=3D VIR_TRISTATE_SWITCH_ON)
+ break;
+
+ virBufferAsprintf(buf, "=
\n",
+ virTristateBoolTypeToString(def->msrs_fe=
atures[VIR_DOMAIN_MSRS_IGNORE_UNKNOWN_WRITES]));
+ break;
+
/* coverity[dead_error_begin] */
case VIR_DOMAIN_FEATURE_LAST:
break;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index f1e6e4e8b7..36926d5e1d 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1782,6 +1782,7 @@ typedef enum {
VIR_DOMAIN_FEATURE_VMCOREINFO,
VIR_DOMAIN_FEATURE_HTM,
VIR_DOMAIN_FEATURE_NESTED_HV,
+ VIR_DOMAIN_FEATURE_MSRS,
=20
VIR_DOMAIN_FEATURE_LAST
} virDomainFeature;
@@ -1813,6 +1814,12 @@ typedef enum {
VIR_DOMAIN_KVM_LAST
} virDomainKVM;
=20
+typedef enum {
+ VIR_DOMAIN_MSRS_IGNORE_UNKNOWN_WRITES =3D 0,
+
+ VIR_DOMAIN_MSRS_LAST
+} virDomainMsrs;
+
typedef enum {
VIR_DOMAIN_CAPABILITIES_POLICY_DEFAULT =3D 0,
VIR_DOMAIN_CAPABILITIES_POLICY_ALLOW,
@@ -2466,6 +2473,7 @@ struct _virDomainDef {
int caps_features[VIR_DOMAIN_CAPS_FEATURE_LAST];
int hyperv_features[VIR_DOMAIN_HYPERV_LAST];
int kvm_features[VIR_DOMAIN_KVM_LAST];
+ int msrs_features[VIR_DOMAIN_MSRS_LAST];
unsigned int hyperv_spinlocks;
virGICVersion gic_version;
virDomainHPTResizing hpt_resizing;
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index f42903a343..f484814977 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -4030,6 +4030,7 @@ qemuDomainDefValidateFeatures(const virDomainDef *def,
case VIR_DOMAIN_FEATURE_PMU:
case VIR_DOMAIN_FEATURE_VMPORT:
case VIR_DOMAIN_FEATURE_VMCOREINFO:
+ case VIR_DOMAIN_FEATURE_MSRS:
case VIR_DOMAIN_FEATURE_LAST:
break;
}
--=20
2.20.1
--
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From: Roman Bogorodskiy
To: libvir-list@redhat.com
Date: Fri, 25 Jan 2019 21:54:45 +0400
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Subject: [libvirt] [PATCH 2/3] bhyve: implement MSRs ignore unknown writes
feature
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Implement the MSRs ignore unkown writes feature that's
specified using:
...
...
in the domain XML.
In bhyve, it's just passing '-w' command line argument to the bhyve(8)
executable.
Signed-off-by: Roman Bogorodskiy
---
docs/drvbhyve.html.in | 16 +++++++++
src/bhyve/bhyve_command.c | 4 +++
.../bhyvexml2argvdata/bhyvexml2argv-msrs.args | 10 ++++++
.../bhyvexml2argv-msrs.ldargs | 3 ++
.../bhyvexml2argvdata/bhyvexml2argv-msrs.xml | 26 ++++++++++++++
tests/bhyvexml2argvtest.c | 1 +
.../bhyvexml2xmlout-msrs.xml | 36 +++++++++++++++++++
tests/bhyvexml2xmltest.c | 1 +
8 files changed, 97 insertions(+)
create mode 100644 tests/bhyvexml2argvdata/bhyvexml2argv-msrs.args
create mode 100644 tests/bhyvexml2argvdata/bhyvexml2argv-msrs.ldargs
create mode 100644 tests/bhyvexml2argvdata/bhyvexml2argv-msrs.xml
create mode 100644 tests/bhyvexml2xmloutdata/bhyvexml2xmlout-msrs.xml
diff --git a/docs/drvbhyve.html.in b/docs/drvbhyve.html.in
index b4d7df2edb..5d67bf358e 100644
--- a/docs/drvbhyve.html.in
+++ b/docs/drvbhyve.html.in
@@ -462,5 +462,21 @@ Example:
</domain>
=20
+
+
+Some guests might require ignoring unknown Model Specific Registers (MS=
Rs) writes.
+Since 5.1.0 it's possible to switch this on u=
sing:
+
+<domain type=3D"bhyve">
+ ...
+ <features>
+ <msrs ignoreUnknownWrites=3D'yes'/>
+ </features>
+ ...
+</domain>
+
+
+By default unknown writes are not ignored.
+