summaryrefslogtreecommitdiffstats
path: root/Documentation/virtual
diff options
context:
space:
mode:
authorPaul Mackerras <paulus@samba.org>2013-09-21 14:35:02 +1000
committerAlexander Graf <agraf@suse.de>2013-10-17 14:45:02 +0200
commit388cc6e133132e6c9b64e7d5361114a3a7d57663 (patch)
tree15414bef7bf1bc0d190d4b5cdb6d55fc2589fa44 /Documentation/virtual
parent4b8473c9c19dff1b0c672f182cc50b9952cf42e7 (diff)
downloadlinux-388cc6e133132e6c9b64e7d5361114a3a7d57663.tar.bz2
KVM: PPC: Book3S HV: Support POWER6 compatibility mode on POWER7
This enables us to use the Processor Compatibility Register (PCR) on POWER7 to put the processor into architecture 2.05 compatibility mode when running a guest. In this mode the new instructions and registers that were introduced on POWER7 are disabled in user mode. This includes all the VSX facilities plus several other instructions such as ldbrx, stdbrx, popcntw, popcntd, etc. To select this mode, we have a new register accessible through the set/get_one_reg interface, called KVM_REG_PPC_ARCH_COMPAT. Setting this to zero gives the full set of capabilities of the processor. Setting it to one of the "logical" PVR values defined in PAPR puts the vcpu into the compatibility mode for the corresponding architecture level. The supported values are: 0x0f000002 Architecture 2.05 (POWER6) 0x0f000003 Architecture 2.06 (POWER7) 0x0f100003 Architecture 2.06+ (POWER7+) Since the PCR is per-core, the architecture compatibility level and the corresponding PCR value are stored in the struct kvmppc_vcore, and are therefore shared between all vcpus in a virtual core. Signed-off-by: Paul Mackerras <paulus@samba.org> [agraf: squash in fix to add missing break statements and documentation] Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'Documentation/virtual')
-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 a9d1072dcbec..25a19576493f 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1837,6 +1837,7 @@ registers, find a list below:
PPC | KVM_REG_PPC_VRSAVE | 32
PPC | KVM_REG_PPC_LPCR | 64
PPC | KVM_REG_PPC_PPR | 64
+ PPC | KVM_REG_PPC_ARCH_COMPAT 32
PPC | KVM_REG_PPC_TM_GPR0 | 64
...
PPC | KVM_REG_PPC_TM_GPR31 | 64