KVM: arm64: Fix nVHE/pKVM hyp tracing error on invalid desc

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pKVM must validate the host-provided tracing buffer descriptor.
However, if an error is found, the hypervisor would just return 0 to the
host. Fix the return value on validation failure.

While at it, rename the function to hyp_trace_desc_is_valid() and skip
validation for the nVHE mode as we trust host-provided data in that
case.

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Fixes: 680a04c333 ("KVM: arm64: Add tracing capability for the nVHE/pKVM hyp")
Link: https://lore.kernel.org/r/20260514162624.3477857-1-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Vincent Donnefort 2026-05-14 17:26:24 +01:00 • committed by Marc Zyngier

parent f19c354dbd

commit 1702da76e0

1 changed files with 7 additions and 2 deletions

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arch/arm64/kvm/hyp/nvhe/trace.c

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