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| author | Lorenzo Stoakes (ARM) <ljs@kernel.org> | 2026-09-23 16:15:57 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2026-09-24 23:28:14 +0100 |
| commit | 6fddb4f6f76910fe0cc2d3d78872b86357899018 (patch) | |
| tree | 83954acfb3886c73d04dc57a16710e659a6089a0 /tools/perf/scripts/python/stackcollapse.py | |
| parent | c4560edbaa81291ee79a97b5e793934cea88500b (diff) | |
| download | linux-next-6fddb4f6f76910fe0cc2d3d78872b86357899018.tar.gz linux-next-6fddb4f6f76910fe0cc2d3d78872b86357899018.zip | |
KVM: selftests: Add nested pre-fault test for arm64
Add an arm64 nested-virtualisation selftest for KVM_PRE_FAULT_MEMORY.
The guest enters vEL2, sets up its EL2 translation configuration into the
real EL1 registers then ERETs to vEL1 and exits to userspace so its vCPU
last-run context is nested backed by a shadow stage 2 MMU.
The test then asserts that pre-faulting ignores that and instead targets
the canonical stage 2 page tables only.
Userspace cannot observe a mistargeted pre-fault, so simply assert that the
pre-faulting works correctly when the last-run context was nested.
Based on a patch by Jack Thomson with gratitude. The test here is
simplified and focused on what can be asserted.
Link: https://lore.kernel.org/kvmarm/20260612162354.73378-6-jackabt.amazon@gmail.com/
Reviewed-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20260923-kvm-arm-prefault-v4-14-d4b0b4dfa8c3@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
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