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authorJames Hogan <james.hogan@imgtec.com>2014-12-08 23:07:56 +0000
committerJames Hogan <james.hogan@imgtec.com>2015-03-27 21:25:18 +0000
commit5fafd8748b366105e08c198892e9fe02ef15c021 (patch)
treee644c6cb5e4acdb1c1047022cd835d8695fd1028 /Documentation/virtual
parent379245cdf1d1efc1eccc38bf0cc985dae232123d (diff)
downloadop-kernel-dev-5fafd8748b366105e08c198892e9fe02ef15c021.zip
op-kernel-dev-5fafd8748b366105e08c198892e9fe02ef15c021.tar.gz
MIPS: KVM: Wire up FPU capability
Now that the code is in place for KVM to support FPU in MIPS KVM guests, wire up the new KVM_CAP_MIPS_FPU capability. For backwards compatibility, the capability must be explicitly enabled in order to detect or make use of the FPU from the guest. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Gleb Natapov <gleb@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-api@vger.kernel.org Cc: linux-doc@vger.kernel.org
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index f3c1983..a1e9bfa 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3312,6 +3312,19 @@ Parameters: none
This capability enables the in-kernel irqchip for s390. Please refer to
"4.24 KVM_CREATE_IRQCHIP" for details.
+6.9 KVM_CAP_MIPS_FPU
+
+Architectures: mips
+Target: vcpu
+Parameters: args[0] is reserved for future use (should be 0).
+
+This capability allows the use of the host Floating Point Unit by the guest. It
+allows the Config1.FP bit to be set to enable the FPU in the guest. Once this is
+done the KVM_REG_MIPS_FPR_* and KVM_REG_MIPS_FCR_* registers can be accessed
+(depending on the current guest FPU register mode), and the Status.FR,
+Config5.FRE bits are accessible via the KVM API and also from the guest,
+depending on them being supported by the FPU.
+
7. Capabilities that can be enabled on VMs
------------------------------------------
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