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| author | Paolo Bonzini <pbonzini@redhat.com> | 2017-07-03 10:41:59 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-07-03 10:41:59 +0200 |
| commit | 8a53e7e572252e551fd4b172dc207f8beca1ae20 (patch) | |
| tree | f3b83b47815ab2b56377188d02c7217048056c2d /Documentation/virtual | |
| parent | KVM: PPC: Book3S: Fix typo in XICS-on-XIVE state saving code (diff) | |
| parent | KVM: PPC: Book3S HV: Close race with testing for signals on guest entry (diff) | |
| download | linux-8a53e7e572252e551fd4b172dc207f8beca1ae20.tar.xz linux-8a53e7e572252e551fd4b172dc207f8beca1ae20.zip | |
Merge branch 'kvm-ppc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD
- Better machine check handling for HV KVM
- Ability to support guests with threads=2, 4 or 8 on POWER9
- Fix for a race that could cause delayed recognition of signals
- Fix for a bug where POWER9 guests could sleep with interrupts
pending.
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 912b7df8215a..3a9831b72945 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -4131,6 +4131,34 @@ Parameters: none Allow use of adapter-interruption suppression. Returns: 0 on success; -EBUSY if a VCPU has already been created. +7.11 KVM_CAP_PPC_SMT + +Architectures: ppc +Parameters: vsmt_mode, flags + +Enabling this capability on a VM provides userspace with a way to set +the desired virtual SMT mode (i.e. the number of virtual CPUs per +virtual core). The virtual SMT mode, vsmt_mode, must be a power of 2 +between 1 and 8. On POWER8, vsmt_mode must also be no greater than +the number of threads per subcore for the host. Currently flags must +be 0. A successful call to enable this capability will result in +vsmt_mode being returned when the KVM_CAP_PPC_SMT capability is +subsequently queried for the VM. This capability is only supported by +HV KVM, and can only be set before any VCPUs have been created. +The KVM_CAP_PPC_SMT_POSSIBLE capability indicates which virtual SMT +modes are available. + +7.12 KVM_CAP_PPC_FWNMI + +Architectures: ppc +Parameters: none + +With this capability a machine check exception in the guest address +space will cause KVM to exit the guest with NMI exit reason. This +enables QEMU to build error log and branch to guest kernel registered +machine check handling routine. Without this capability KVM will +branch to guests' 0x200 interrupt vector. + 8. Other capabilities. ---------------------- @@ -4292,3 +4320,12 @@ Currently the following bits are defined for the device_irq_level bitmap: Future versions of kvm may implement additional events. These will get indicated by returning a higher number from KVM_CHECK_EXTENSION and will be listed above. + +8.10 KVM_CAP_PPC_SMT_POSSIBLE + +Architectures: ppc + +Querying this capability returns a bitmap indicating the possible +virtual SMT modes that can be set using KVM_CAP_PPC_SMT. If bit N +(counting from the right) is set, then a virtual SMT mode of 2^N is +available. |