KVM: selftests: Add option to rseq test to override /dev/cpu_dma_latency

Add a "-l <latency>" param to the rseq test so that the user can override
/dev/cpu_dma_latency, as described by the test's suggested workaround for
not being able to complete enough migrations.

cpu_dma_latency is not a normal file, even as far as procfs files go.
Writes to cpu_dma_latency only persist so long as the file is open, e.g.
so that the kernel automatically reverts back to a power-optimized state
once the sensitive workload completes.  Provide the necessary functionality
instead of effectively forcing the user to write a non-obvious wrapper.

Cc: Dongsheng Zhang <[email protected]>
Cc: Zide Chen <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

0 files changed, 0 insertions, 0 deletions