From: Avi Kivity Date: Mon, 29 Aug 2011 13:27:08 +0000 (+0300) Subject: KVM: Restore missing powerpc API docs X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=364426871ca33752a6e8fcfccec4d89e2eaf06f7;p=linux-beck.git KVM: Restore missing powerpc API docs Commit 371fefd6 lost a doc hunk somehow, restore it. Signed-off-by: Avi Kivity --- diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 75cd8fba0cde..2d510b6a649a 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -200,6 +200,19 @@ allocation of vcpu ids. For example, if userspace wants single-threaded guest vcpus, it should make all vcpu ids be a multiple of the number of vcpus per vcore. +On powerpc using book3s_hv mode, the vcpus are mapped onto virtual +threads in one or more virtual CPU cores. (This is because the +hardware requires all the hardware threads in a CPU core to be in the +same partition.) The KVM_CAP_PPC_SMT capability indicates the number +of vcpus per virtual core (vcore). The vcore id is obtained by +dividing the vcpu id by the number of vcpus per vcore. The vcpus in a +given vcore will always be in the same physical core as each other +(though that might be a different physical core from time to time). +Userspace can control the threading (SMT) mode of the guest by its +allocation of vcpu ids. For example, if userspace wants +single-threaded guest vcpus, it should make all vcpu ids be a multiple +of the number of vcpus per vcore. + 4.8 KVM_GET_DIRTY_LOG (vm ioctl) Capability: basic