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authorPaul Mackerras <paulus@ozlabs.org>2018-10-08 14:24:30 +1100
committerPaul Mackerras <paulus@ozlabs.org>2018-10-09 16:14:54 +1100
commit901f8c3f6feb0225c14b3bc6237850fb921d2f2d (patch)
treed9f4edd5ed3899d8270b329990292ba5b52079d4 /Documentation/virtual
parentaa069a996951f3e2e38437ef0316685a5893fc7e (diff)
downloadlinux-901f8c3f6feb0225c14b3bc6237850fb921d2f2d.tar.bz2
KVM: PPC: Book3S HV: Add NO_HASH flag to GET_SMMU_INFO ioctl result
This adds a KVM_PPC_NO_HASH flag to the flags field of the kvm_ppc_smmu_info struct, and arranges for it to be set when running as a nested hypervisor, as an unambiguous indication to userspace that HPT guests are not supported. Reporting the KVM_CAP_PPC_MMU_HASH_V3 capability as false could be taken as indicating only that the new HPT features in ISA V3.0 are not supported, leaving it ambiguous whether pre-V3.0 HPT features are supported. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index fde48b6708f1..df98b6304769 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2270,6 +2270,10 @@ The supported flags are:
The emulated MMU supports 1T segments in addition to the
standard 256M ones.
+ - KVM_PPC_NO_HASH
+ This flag indicates that HPT guests are not supported by KVM,
+ thus all guests must use radix MMU mode.
+
The "slb_size" field indicates how many SLB entries are supported
The "sps" array contains 8 entries indicating the supported base