On 3/15/19 12:41 PM, Pavel Hrdina wrote:
Get all CPU security features that we should enable for guests.
In order to do that we need to get CPU definition from domain
capabilities and modify the XML so it is in required format for
libvirt CPU baseline APIs. We will prefer the baselineHypervisorCPU
API because that considers what QEMU actually supports and we will
fallback to baselineCPU API if the better one is not supported by
libvirt.
This way we can figure out which of the security features are actually
available on that specific host for that specific QEMU binary.
Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
---
virtinst/domcapabilities.py | 43 +++++++++++++++++++++++++++++++++++++
virtinst/support.py | 4 ++++
2 files changed, 47 insertions(+)
diff --git a/virtinst/domcapabilities.py b/virtinst/domcapabilities.py
index deef9e6a..7576472d 100644
--- a/virtinst/domcapabilities.py
+++ b/virtinst/domcapabilities.py
@@ -8,7 +8,11 @@
import logging
import re
+import xml.etree.ElementTree as ET
+import libvirt
+
+from .domain import DomainCpu
from .xmlbuilder import XMLBuilder, XMLChildProperty, XMLProperty
@@ -243,6 +247,45 @@ class DomainCapabilities(XMLBuilder):
return models
+ def _convert_mode_to_cpu(self, xml):
+ root = ET.fromstring(xml)
+ root.tag = "cpu"
+ root.attrib = None
+ arch = ET.SubElement(root, "arch")
+ arch.text = self.arch
+ return ET.tostring(root, encoding="unicode")
+
+ def get_cpu_security_features(self):
+ sec_features = [
+ 'pcid',
+ 'spec-ctrl',
+ 'ssbd',
+ 'pdpe1gb',
+ 'ibpb',
+ 'virt-ssbd',
+ 'amd-ssbd',
+ 'amd-no-ssb']
+
+ features = []
+
+ for m in self.cpu.modes:
+ if m.name == "host-model":
If you check for != "host-model" you can 'continue' and save a bunch of
indentation
Adding new API calls for the default virt-install invocation makes me a
bit nervous, so let's be on the safe side, I suggest moving everything
up to the 'cpu' building into its own function, then wrap the call in
try/except to make errors non-fatal. Add a logging.warn call when it
fails so if virt-install hits this the user is notified and it's more
likely we will get a bug report.
+ cpuXML = self._convert_mode_to_cpu(m.get_xml())
Please log the generated XML here, something like 'CPU XML for security
flag baseline: %s
+ if self.conn.check_support(self.conn.SUPPORT_CONN_HYPERVISOR_BASELINE):
+ expandedXML = self.conn.baselineHypervisorCPU(
+ self.path, self.arch, self.machine, self.domain, [cpuXML],
+ libvirt.VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES)
+ else:
+ expandedXML = self.conn.baselineCPU([cpuXML],
+ libvirt.VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES)
And log the expandedXML here too
+ cpu = DomainCpu(self.conn, expandedXML) > +
+ for feature in cpu.features:
+ if feature.name in sec_features:
+ features.append(feature.name)
+
+ return features
+
XML_NAME = "domainCapabilities"
os = XMLChildProperty(_OS, is_single=True)
diff --git a/virtinst/support.py b/virtinst/support.py
index 7ace3ef6..077be426 100644
--- a/virtinst/support.py
+++ b/virtinst/support.py
@@ -278,6 +278,10 @@ SUPPORT_CONN_DISK_DRIVER_NAME_QEMU = _make(
hv_version={"qemu": 0, "xen": "4.2.0"},
hv_libvirt_version={"qemu": 0, "xen": "1.1.0"})
+SUPPORT_CONN_HYPERVISOR_BASELINE = _make(
+ version="4.4.0",
+ hv_libvirt_version={"test": 0})
+
I think this should be hv_libvirt_version={"qemu", 0}, meaning: assume
support if libvirt version >= 4.4.0, driver=qemu, qemu driver version >
0. The test driver doesn't appear to implement this API
Thanks,
Cole
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