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| author | Amit Machhiwal <amachhiw@linux.ibm.com> | 2025-02-20 10:00:02 +0300 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2025-03-07 16:50:04 +0300 |
| commit | b4392813bbc3b05fc01a33c64d8b8c6c62c32cfa (patch) | |
| tree | 09168632b131e574b996afa4bbe91a829e14f1b4 /tools/perf/scripts/python/parallel-perf.py | |
| parent | 7e67ef889c9ab7246547db73d524459f47403a77 (diff) | |
| download | linux-b4392813bbc3b05fc01a33c64d8b8c6c62c32cfa.tar.xz | |
KVM: PPC: Enable CAP_SPAPR_TCE_VFIO on pSeries KVM guests
Currently on book3s-hv, the capability KVM_CAP_SPAPR_TCE_VFIO is only
available for KVM Guests running on PowerNV and not for the KVM guests
running on pSeries hypervisors. This prevents a pSeries L2 guest from
leveraging the in-kernel acceleration for H_PUT_TCE_INDIRECT and
H_STUFF_TCE hcalls that results in slow startup times for large memory
guests.
Support for VFIO on pSeries was restored in commit f431a8cde7f1
("powerpc/iommu: Reimplement the iommu_table_group_ops for pSeries"),
making it possible to re-enable this capability on pSeries hosts.
This change enables KVM_CAP_SPAPR_TCE_VFIO for nested PAPR guests on
pSeries, while maintaining the existing behavior on PowerNV. Booting an
L2 guest with 128GB of memory shows an average 11% improvement in
startup time.
Fixes: f431a8cde7f1 ("powerpc/iommu: Reimplement the iommu_table_group_ops for pSeries")
Cc: stable@vger.kernel.org
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250220070002.1478849-1-amachhiw@linux.ibm.com
Diffstat (limited to 'tools/perf/scripts/python/parallel-perf.py')
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