linux-kernel - Re: [PATCH v5 6/7] KVM: selftest: Drop now-unnecessary ucall

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Date:   Mon, 29 Aug 2022 18:21:11 +0200
From:   Andrew Jones <andrew.jones@...ux.dev>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Atish Patra <atishp@...shpatra.org>,
        David Hildenbrand <david@...hat.com>,
        Tom Rix <trix@...hat.com>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Colton Lewis <coltonlewis@...gle.com>,
        Peter Gonda <pgonda@...gle.com>
Subject: Re: [PATCH v5 6/7] KVM: selftest: Drop now-unnecessary ucall_uninit()

On Thu, Aug 25, 2022 at 11:25:21PM +0000, Sean Christopherson wrote:
> Drop ucall_uninit() and ucall_arch_uninit() now that ARM doesn't modify
> the host's copy of ucall_exit_mmio_addr, i.e. now that there's no need to
> reset the pointer before potentially creating a new VM.  The few calls to
> ucall_uninit() are all immediately followed by kvm_vm_free(), and that is
> likely always going to hold true, i.e. it's extremely unlikely a test
> will want to effectively disable ucall in the middle of a test.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  tools/testing/selftests/kvm/dirty_log_test.c       |  1 -
>  tools/testing/selftests/kvm/include/ucall_common.h |  6 ------
>  tools/testing/selftests/kvm/kvm_page_table_test.c  |  1 -
>  tools/testing/selftests/kvm/lib/aarch64/ucall.c    | 14 ++------------
>  tools/testing/selftests/kvm/lib/perf_test_util.c   |  1 -
>  tools/testing/selftests/kvm/lib/riscv/ucall.c      |  4 ----
>  tools/testing/selftests/kvm/lib/s390x/ucall.c      |  4 ----
>  tools/testing/selftests/kvm/lib/x86_64/ucall.c     |  4 ----
>  8 files changed, 2 insertions(+), 33 deletions(-)
>

Reviewed-by: Andrew Jones <andrew.jones@...ux.dev>