KVM: arm64: Add tracepoint for MMIO accesses where ISV==0

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It is a pretty well known fact that KVM does not support MMIO emulation
without valid instruction syndrome information (ESR_EL2.ISV == 0). The
current kvm_pr_unimpl() is pretty useless, as it contains zero context
to relate the event to a vCPU.

Replace it with a precise tracepoint that dumps the relevant context
so the user can make sense of what the guest is doing.

Acked-by: Zenghui Yu <yuzenghui@huawei.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231026205306.3045075-1-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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This commit is contained in:

Oliver Upton 2023-10-26 20:53:06 +00:00

parent 06899aa5dd

commit d11974dc5f

2 changed files with 28 additions and 1 deletions

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4

arch/arm64/kvm/mmio.c

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25

arch/arm64/kvm/trace_arm.h

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