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authorPaul Mackerras <paulus@samba.org>2013-09-20 06:52:38 +0200
committerAlexander Graf <agraf@suse.de>2013-10-17 14:45:01 +0200
commita0144e2a6b0b4a137a32f0102354782547bf0935 (patch)
treeafc87f1baa02328aaf7a66209ad1d96aef4e533c /Documentation
parentKVM: PPC: BookE: Add GET/SET_ONE_REG interface for VRSAVE (diff)
downloadlinux-a0144e2a6b0b4a137a32f0102354782547bf0935.tar.xz
linux-a0144e2a6b0b4a137a32f0102354782547bf0935.zip
KVM: PPC: Book3S HV: Store LPCR value for each virtual core
This adds the ability to have a separate LPCR (Logical Partitioning Control Register) value relating to a guest for each virtual core, rather than only having a single value for the whole VM. This corresponds to what real POWER hardware does, where there is a LPCR per CPU thread but most of the fields are required to have the same value on all active threads in a core. The per-virtual-core LPCR can be read and written using the GET/SET_ONE_REG interface. Userspace can can only modify the following fields of the LPCR value: DPFD Default prefetch depth ILE Interrupt little-endian TC Translation control (secondary HPT hash group search disable) We still maintain a per-VM default LPCR value in kvm->arch.lpcr, which contains bits relating to memory management, i.e. the Virtualized Partition Memory (VPM) bits and the bits relating to guest real mode. When this default value is updated, the update needs to be propagated to the per-vcore values, so we add a kvmppc_update_lpcr() helper to do that. Signed-off-by: Paul Mackerras <paulus@samba.org> [agraf: fix whitespace] Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/virtual/kvm/api.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 26fc37355dcb..387f4c7dad9f 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1835,6 +1835,7 @@ registers, find a list below:
PPC | KVM_REG_PPC_PID | 64
PPC | KVM_REG_PPC_ACOP | 64
PPC | KVM_REG_PPC_VRSAVE | 32
+ PPC | KVM_REG_PPC_LPCR | 64
PPC | KVM_REG_PPC_TM_GPR0 | 64
...
PPC | KVM_REG_PPC_TM_GPR31 | 64