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https://github.com/virt-manager/virt-manager.git
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58 lines
2.3 KiB
Python
58 lines
2.3 KiB
Python
from ..xmlbuilder import XMLBuilder, XMLProperty
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class DomainLaunchSecurity(XMLBuilder):
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"""
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Class for generating <launchSecurity> XML element
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"""
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XML_NAME = "launchSecurity"
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_XML_PROP_ORDER = ["type", "cbitpos", "reducedPhysBits", "policy",
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"session", "dhCert"]
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type = XMLProperty("./@type")
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cbitpos = XMLProperty("./cbitpos", is_int=True)
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reducedPhysBits = XMLProperty("./reducedPhysBits", is_int=True)
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policy = XMLProperty("./policy")
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session = XMLProperty("./session")
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dhCert = XMLProperty("./dhCert")
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kernelHashes = XMLProperty("./@kernelHashes", is_yesno=True)
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def is_sev(self):
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return self.type == "sev"
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def validate(self):
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if not self.type:
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raise RuntimeError(_("Missing mandatory attribute 'type'"))
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def _set_defaults_sev(self, guest):
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# SeaBIOS doesn't have support for SEV. Q35 defaults to virtio 1.0,
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# which we need so let's not go through the 'virtio-transitional'
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# exercise for pc-i440fx to make SEV work, AMD recommends Q35 anyway
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# NOTE: at some point both of these platform checks should be put in
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# validate(), once that accepts the 'guest' instance
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if not guest.os.is_q35() or not guest.is_uefi():
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raise RuntimeError(_("SEV launch security requires a Q35 UEFI machine"))
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# libvirt or QEMU might not support SEV
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domcaps = guest.lookup_domcaps()
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if not domcaps.supports_sev_launch_security():
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raise RuntimeError(_("SEV launch security is not supported on this platform"))
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# 'policy' is a mandatory 4-byte argument for the SEV firmware,
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# if missing, let's use 0x03 which, according to the table at
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# https://libvirt.org/formatdomain.html#launchSecurity:
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# (bit 0) - disables the debugging mode
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# (bit 1) - disables encryption key sharing across multiple guests
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if self.policy is None:
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self.policy = "0x03"
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if self.cbitpos is None:
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self.cbitpos = domcaps.features.sev.cbitpos
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if self.reducedPhysBits is None:
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self.reducedPhysBits = domcaps.features.sev.reducedPhysBits
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def set_defaults(self, guest):
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if self.is_sev():
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return self._set_defaults_sev(guest)
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