[PATCH v2 4/4] KVM: arm64: selftests: Add a test case for KVM_GUESTDBG_SINGLESTEP

[Marc Zyngier]

On Sat, 17 Sep 2022 02:06:00 +0100,
Reiji Watanabe <reijiw at google.com> wrote:
> 
> Add a test case for KVM_GUESTDBG_SINGLESTEP to the debug-exceptions test.
> The test enables single-step execution from userspace, and check if the
> exit to userspace occurs for each instruction that is stepped.
> Set the default number of the test iterations to a number of iterations
> sufficient to always reproduce the problem that the previous patch fixes
> on an Ampere Altra machine.

A possibly more aggressive version of this test would be to force a
(short lived) timer to fire on the same CPU, forcing an exit. This
should hopefully result in a more predictable way to trigger the
issue. But that's a reasonable test as a start.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.