diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/confidential-guest-support.txt | 3 | ||||
| -rw-r--r-- | docs/system/s390x/protvirt.rst | 19 |
2 files changed, 16 insertions, 6 deletions
diff --git a/docs/confidential-guest-support.txt b/docs/confidential-guest-support.txt index 4da4c91bd3..71d07ba57a 100644 --- a/docs/confidential-guest-support.txt +++ b/docs/confidential-guest-support.txt @@ -43,4 +43,7 @@ AMD Secure Encrypted Virtualization (SEV) POWER Protected Execution Facility (PEF) docs/papr-pef.txt +s390x Protected Virtualization (PV) + docs/system/s390x/protvirt.rst + Other mechanisms may be supported in future. diff --git a/docs/system/s390x/protvirt.rst b/docs/system/s390x/protvirt.rst index 712974ad87..0f481043d9 100644 --- a/docs/system/s390x/protvirt.rst +++ b/docs/system/s390x/protvirt.rst @@ -22,15 +22,22 @@ If those requirements are met, the capability `KVM_CAP_S390_PROTECTED` will indicate that KVM can support PVMs on that LPAR. -QEMU Settings -------------- +Running a Protected Virtual Machine +----------------------------------- -To indicate to the VM that it can transition into protected mode, the +To run a PVM you will need to select a CPU model which includes the `Unpack facility` (stfle bit 161 represented by the feature -`unpack`/`S390_FEAT_UNPACK`) needs to be part of the cpu model of -the VM. +`unpack`/`S390_FEAT_UNPACK`), and add these options to the command line:: + + -object s390-pv-guest,id=pv0 \ + -machine confidential-guest-support=pv0 + +Adding these options will: + +* Ensure the `unpack` facility is available +* Enable the IOMMU by default for all I/O devices +* Initialize the PV mechanism -All I/O devices need to use the IOMMU. Passthrough (vfio) devices are currently not supported. Host huge page backings are not supported. However guests can use huge |