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authorPaolo Bonzini <pbonzini@redhat.com>2017-07-03 10:41:59 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2017-07-03 10:41:59 +0200
commit8a53e7e572252e551fd4b172dc207f8beca1ae20 (patch)
treef3b83b47815ab2b56377188d02c7217048056c2d /Documentation/virtual
parent00c14757f6abacd78cad9b2690a0e1f42e4b76c8 (diff)
parent8b24e69fc47e43679bb29ddb481aa0e8dce2a3c5 (diff)
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.txt37
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.