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conf: cpu: add limit for maxphysaddr

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Add a limit attribute to restrict the maximum physical address bits
that would be used for the guest CPU:

   <cpu mode='host-passthrough'>
     <maxphysaddr mode='passthrough' limit='39'/>
   </cpu>

https://gitlab.com/libvirt/libvirt/-/issues/450
https://bugzilla.redhat.com/show_bug.cgi?id=2171860

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Ján Tomko 2023-03-01 11:27:30 +01:00
parent 46410c2be8
commit d6fbb21210
7 changed files with 78 additions and 1 deletions
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7
docs/formatdomain.rst
View File

@ -1374,7 +1374,7 @@ following collection of elements. :since:`Since 0.7.5`
<cpu mode='host-passthrough' migratable='off'>
<cache mode='passthrough'/>
<maxphysaddr mode='passthrough'/>
<maxphysaddr mode='passthrough' limit='39'/>
<feature policy='disable' name='lahf_lm'/>
...
@ -1644,6 +1644,11 @@ In case no restrictions need to be put on CPU model and its features, a simpler
The ``bits`` attribute is mandatory if the ``mode`` attribute is set to
``emulate`` and specifies the virtual CPU address size in bits.
``limit``
The ``limit`` attribute can be used to restrict the maximum value of
address bits for ``passthrough`` mode, i.e. in case the host CPU reports
more bits than that, ``limit`` is used. :since:`Since 9.3.0`
Guest NUMA topology can be specified using the ``numa`` element. :since:`Since
0.9.8`

13
src/conf/cpu_conf.c
View File

@ -668,6 +668,17 @@ virCPUDefParseXML(xmlXPathContextPtr ctxt,
VIR_XML_PROP_NONNEGATIVE,
&def->addr->bits, -1) < 0)
return -1;
if ((rv = virXMLPropUInt(maxphysaddrNode, "limit", 10,
VIR_XML_PROP_NONZERO,
&def->addr->limit)) < 0) {
return -1;
} else if (rv > 0 && def->addr->mode != VIR_CPU_MAX_PHYS_ADDR_MODE_PASSTHROUGH) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("attribute 'limit' is only supported for maxphysaddr mode 'passthrough'"));
return -1;
}
}
*cpu = g_steal_pointer(&def);
@ -843,6 +854,8 @@ virCPUDefFormatBuf(virBuffer *buf,
virCPUMaxPhysAddrModeTypeToString(def->addr->mode));
if (def->addr->bits != -1)
virBufferAsprintf(buf, " bits='%d'", def->addr->bits);
if (def->addr->limit > 0)
virBufferAsprintf(buf, " limit='%d'", def->addr->limit);
virBufferAddLit(buf, "/>\n");
}

1
src/conf/cpu_conf.h
View File

@ -128,6 +128,7 @@ VIR_ENUM_DECL(virCPUMaxPhysAddrMode);
typedef struct _virCPUMaxPhysAddrDef virCPUMaxPhysAddrDef;
struct _virCPUMaxPhysAddrDef {
int bits; /* -1 for unspecified */
unsigned int limit; /* 0 for unspecified */
virCPUMaxPhysAddrMode mode;
};

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

@ -318,6 +318,11 @@
<ref name="unsignedInt"/>
</attribute>
</optional>
<optional>
<attribute name="limit">
<ref name="unsignedInt"/>
</attribute>
</optional>
</element>
</define>

20
tests/qemuxml2argvdata/cpu-phys-bits-limit.xml Normal file
View File

@ -0,0 +1,20 @@
<domain type='kvm'>
<name>foo</name>
<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
<memory unit='KiB'>219136</memory>
<currentMemory unit='KiB'>219136</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc'>hvm</type>
<boot dev='hd'/>
</os>
<cpu mode='host-passthrough'>
<maxphysaddr mode='passthrough' limit='39'/>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
</devices>
</domain>

31
tests/qemuxml2xmloutdata/cpu-phys-bits-limit.x86_64-latest.xml Normal file
View File

@ -0,0 +1,31 @@
<domain type='kvm'>
<name>foo</name>
<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
<memory unit='KiB'>219136</memory>
<currentMemory unit='KiB'>219136</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc'>hvm</type>
<boot dev='hd'/>
</os>
<cpu mode='host-passthrough' check='none' migratable='on'>
<maxphysaddr mode='passthrough' limit='39'/>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<controller type='usb' index='0' model='piix3-uhci'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</memballoon>
</devices>
</domain>

2
tests/qemuxml2xmltest.c
View File

@ -1247,6 +1247,8 @@ mymain(void)
DO_TEST_CAPS_LATEST("crypto-builtin");
DO_TEST_CAPS_LATEST("cpu-phys-bits-limit");
cleanup:
qemuTestDriverFree(&driver);
virFileWrapperClearPrefixes();