linux-kernel - Re: [PATCH 05/44] KVM: s390: Unwind kvm_arch_init() piece-by-piece() if a step fails

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Message-ID: <1386ccd1ff60cb8e4af80fbb294160a8d7cc3b5b.camel@linux.ibm.com>
Date:   Mon, 07 Nov 2022 12:57:17 -0500
From:   Eric Farman <farman@...ux.ibm.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        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>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     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>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Isaku Yamahata <isaku.yamahata@...el.com>,
        Fabiano Rosas <farosas@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Chao Gao <chao.gao@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yuan Yao <yuan.yao@...el.com>
Subject: Re: [PATCH 05/44] KVM: s390: Unwind kvm_arch_init()
 piece-by-piece() if a step fails

On Wed, 2022-11-02 at 23:18 +0000, Sean Christopherson wrote:
> In preparation for folding kvm_arch_hardware_setup() into
> kvm_arch_init(),
> unwind initialization one step at a time instead of simply calling
> kvm_arch_exit().  Using kvm_arch_exit() regardless of which
> initialization
> step failed relies on all affected state playing nice with being
> undone
> even if said state wasn't first setup.  That holds true for state
> that is
> currently configured by kvm_arch_init(), but not for state that's
> handled
> by kvm_arch_hardware_setup(), e.g. calling
> gmap_unregister_pte_notifier()
> without first registering a notifier would result in list corruption
> due
> to attempting to delete an entry that was never added to the list.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/s390/kvm/kvm-s390.c | 21 ++++++++++++++-------
>  1 file changed, 14 insertions(+), 7 deletions(-)

Reviewed-by: Eric Farman <farman@...ux.ibm.com>