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conf: Introduce MTE domain feature

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The Memory Tagging Extensions are hardware acceleration present
in some ARM processors that allow memory error detection [1].
Introduce a domain XML knob that turns them on or off.

1: https://www.arm.com/blogs/blueprint/memory-safety-arm-memory-tagging-extension
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Michal Privoznik 2023-05-15 13:55:31 +02:00
parent 37e41b7f16
commit 720e8f13ff
7 changed files with 21 additions and 1 deletions
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7
docs/formatdomain.rst
View File

@ -2000,6 +2000,7 @@ Hypervisors may allow certain CPU / machine features to be toggled on/off.
<tcg>
<tb-cache unit='MiB'>128</tb-cache>
</tcg>
<mte state='on'/>
</features>
...
@ -2230,6 +2231,12 @@ are:
tb-cache The size of translation block cache size an integer (a multiple of MiB) :since:`8.0.0`
=========== ============================================== =================================================== ==============
``mte``
Configure Memory Tagging Extensions for ARM guests. Possible values for the
``state`` attribute are ``on`` and ``off``. If the attribute is not
defined, the hypervisor default will be used. :since:`Since 9.4.0` (QEMU/KVM
only)
Time keeping
------------

6
src/conf/domain_conf.c
View File

@ -181,6 +181,7 @@ VIR_ENUM_IMPL(virDomainFeature,
"sbbc",
"ibs",
"tcg",
"mte",
);
VIR_ENUM_IMPL(virDomainCapabilitiesPolicy,
@ -16645,7 +16646,8 @@ virDomainFeaturesDefParse(virDomainDef *def,
case VIR_DOMAIN_FEATURE_HTM:
case VIR_DOMAIN_FEATURE_NESTED_HV:
case VIR_DOMAIN_FEATURE_CCF_ASSIST: {
case VIR_DOMAIN_FEATURE_CCF_ASSIST:
case VIR_DOMAIN_FEATURE_MTE: {
virTristateSwitch state;
if (virXMLPropTristateSwitch(nodes[i], "state",
@ -20486,6 +20488,7 @@ virDomainDefFeaturesCheckABIStability(virDomainDef *src,
case VIR_DOMAIN_FEATURE_HTM:
case VIR_DOMAIN_FEATURE_NESTED_HV:
case VIR_DOMAIN_FEATURE_CCF_ASSIST:
case VIR_DOMAIN_FEATURE_MTE:
if (src->features[i] != dst->features[i]) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("State of feature '%1$s' differs: source: '%2$s', destination: '%3$s'"),
@ -27005,6 +27008,7 @@ virDomainDefFormatFeatures(virBuffer *buf,
case VIR_DOMAIN_FEATURE_HTM:
case VIR_DOMAIN_FEATURE_NESTED_HV:
case VIR_DOMAIN_FEATURE_CCF_ASSIST:
case VIR_DOMAIN_FEATURE_MTE:
switch ((virTristateSwitch) def->features[i]) {
case VIR_TRISTATE_SWITCH_LAST:
case VIR_TRISTATE_SWITCH_ABSENT:

1
src/conf/domain_conf.h
View File

@ -2169,6 +2169,7 @@ typedef enum {
VIR_DOMAIN_FEATURE_SBBC,
VIR_DOMAIN_FEATURE_IBS,
VIR_DOMAIN_FEATURE_TCG,
VIR_DOMAIN_FEATURE_MTE,
VIR_DOMAIN_FEATURE_LAST
} virDomainFeature;

5
src/conf/schemas/domaincommon.rng
View File

@ -6653,6 +6653,11 @@
<optional>
<ref name="tcgfeatures"/>
</optional>
<optional>
<element name="mte">
<ref name="featurestate"/>
</element>
</optional>
</interleave>
</element>
</optional>

1
src/qemu/qemu_validate.c
View File

@ -123,6 +123,7 @@ qemuValidateDomainDefFeatures(const virDomainDef *def,
break;
case VIR_DOMAIN_FEATURE_GIC:
case VIR_DOMAIN_FEATURE_MTE:
if (def->features[i] == VIR_TRISTATE_SWITCH_ON &&
!qemuDomainIsARMVirt(def)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,

1
tests/qemuxml2argvdata/aarch64-gic-v3.xml
View File

@ -10,6 +10,7 @@
</os>
<features>
<gic version='3'/>
<mte state='on'/>
</features>
<cpu mode='host-passthrough' check='none'/>
<clock offset='utc'/>

1
tests/qemuxml2xmloutdata/aarch64-gic-v3.aarch64-latest.xml
View File

@ -10,6 +10,7 @@
</os>
<features>
<gic version='3'/>
<mte state='on'/>
</features>
<cpu mode='host-passthrough' check='none'/>
<clock offset='utc'/>