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From:   Kristina Martsenko <kristina.martsenko@arm.com>
Subject: Re: [PATCH v7 5/10] KVM: arm/arm64: preserve host MDCR_EL2 value
To:     Amit Daniel Kachhap <amit.kachhap@arm.com>,
        linux-arm-kernel@lists.infradead.org
Cc:     Christoffer Dall <christoffer.dall@arm.com>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andrew Jones <drjones@redhat.com>,
        Dave Martin <Dave.Martin@arm.com>,
        Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>,
        kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
        Mark Rutland <mark.rutland@arm.com>,
        James Morse <james.morse@arm.com>,
        Julien Thierry <julien.thierry@arm.com>
References: <1552984243-7689-1-git-send-email-amit.kachhap@arm.com>
 <1552984243-7689-6-git-send-email-amit.kachhap@arm.com>
Message-ID: <19c2bdb3-6917-286e-3f2a-35fd71f69f51@arm.com>
Date:   Mon, 25 Mar 2019 20:04:05 +0000
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On 19/03/2019 08:30, Amit Daniel Kachhap wrote:
> Save host MDCR_EL2 value during kvm HYP initialisation and restore
> after every switch from host to guest. There should not be any
> change in functionality due to this.
> 
> The value of mdcr_el2 is now stored in struct kvm_cpu_context as
> both host and guest can now use this field in a common way.
> 
> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
> Acked-by: Mark Rutland <mark.rutland@arm.com>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Christoffer Dall <christoffer.dall@arm.com>
> Cc: kvmarm@lists.cs.columbia.edu

[...]

>  /**
> - * kvm_arm_init_debug - grab what we need for debug
> - *
> - * Currently the sole task of this function is to retrieve the initial
> - * value of mdcr_el2 so we can preserve MDCR_EL2.HPMN which has
> - * presumably been set-up by some knowledgeable bootcode.
> - *
> - * It is called once per-cpu during CPU hyp initialisation.
> - */
> -
> -void kvm_arm_init_debug(void)
> -{
> -	__this_cpu_write(mdcr_el2, kvm_call_hyp_ret(__kvm_get_mdcr_el2));
> -}

The __kvm_get_mdcr_el2 function is no longer used anywhere, so can also
be removed.

Thanks,
Kristina