linux-kernel - Re: [RFC PATCH v3 04/11] KVM: arm64: Setup a framework for hypercall bitmap firmware registers

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Date:   Thu, 13 Jan 2022 22:23:49 -0800
From:   Reiji Watanabe <reijiw@...gle.com>
To:     Raghavendra Rao Ananta <rananta@...gle.com>
Cc:     Marc Zyngier <maz@...nel.org>, Andrew Jones <drjones@...hat.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [RFC PATCH v3 04/11] KVM: arm64: Setup a framework for hypercall
 bitmap firmware registers

> > > > > +static void
> > > > > +kvm_arm_get_fw_reg_bmap(struct kvm_vcpu *vcpu, u64 fw_reg_bmap, u64 *val)
> > > > > +{
> > > > > +       struct kvm *kvm = vcpu->kvm;
> > > > > +
> > > > > +       mutex_lock(&kvm->lock);
> > > > > +       *val = fw_reg_bmap;
> > > > > +       mutex_unlock(&kvm->lock);
> > > >

I have another comment for kvm_arm_get_fw_reg_bmap.

I just noticed that @fw_reg_bmap is a value of the bitmap register
(not a pointer).  I believe what you meant was a pointer to
hvc_desc->hvc_*_bmap.  Also, you can remove @val and return the register
value instead (change the type of the return value from void to u64).
I'm not sure if you will keep this function in the next version though.

Thanks,
Reiji