Re: [Qemu-devel] [RFC 00/11] Current MTTCG kvm-unit-test patches

[Andrew Jones]

On Fri, Feb 26, 2016 at 01:15:22PM +0000, Alex Bennée wrote:
> Hi,
> 
> Some of these patches have been posted before and previous patches
> have already been accepted upstream so I'm tagging this as a new RFC
> series.
> 
> This is a series of tests built around kvm-unit-tests but built with
> the express purpose of stressing the TCG, in particular MTTCG builds.
> 
> Changes from previous appearances:
> 
>  * Separated locking and barrier tests
>  * Included Drew's IPI patches (used in tcg-test)
>  * New TCG chaining test
> 
> The new barrier tests really only fails when running on MTTCG builds on
> a weak backend. Many thanks to Will Deacon for helping me get a
> working test case at the last Connect.
> 
> I'm mainly posting these for reference for others testing MTTCG as
> I've still got to check I've addressed any outstanding review
> comments. However there has been enough code churn some of the
> comments may no longer be relevant.
> 
> The TCG tests are also useful as benchmarks for comparing the cost of
> having chained basic blocks versus exiting the loop every time. The
> pathological case is the computed jumps test as all the addresses are
> within a PAGE_SIZE boundary the tb_jump_cache has no effect meaning a
> full look up each time.
> 
> Alex Bennée (8):
>   config/config-arm-common: build-up tests-common target
>   lib: add isaac prng library from CCAN
>   arm/run: set indentation defaults for emacs
>   arm/run: allow aarch64 to start arm binaries
>   arm/tlbflush-test: Add TLB torture test
>   arm/locking-tests: add comprehensive locking test
>   arm/barrier-litmus-tests: add some litmus tests
>   arm/tcg-test: some basic TCG exercising tests
> 
> Andrew Jones (3):
>   arm/arm64: irq enable/disable
>   arm/arm64: Add initial gic support
>   arm/arm64: Add IPI test

I've actually updated these patches a bit, and started extending the
series to also work with a v3 gic. I'll pick that back up and get it
posted for you (hopefully next week). Or I'll at least update my
arm/ipi-test branch with the changes I've made for gicv2...

drew