From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bharata B Rao <bharata@linux.ibm.com>
Date: Mon, 16 Dec 2019 03:41:11 +0000
Subject: Re: [PATCH V3 2/2] KVM: PPC: Implement H_SVM_INIT_ABORT hcall
Message-Id: <20191216032911.GA25495@in.ibm.com>
List-Id: <kvm-ppc.vger.kernel.org>
References: <20191215021104.GA27378@us.ibm.com>
 <20191215021208.GB27378@us.ibm.com>
In-Reply-To: <20191215021208.GB27378@us.ibm.com>
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To: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>, Paul Mackerras <paulus@ozlabs.org>, linuxram@us.ibm.com, kvm-ppc@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org

On Sat, Dec 14, 2019 at 06:12:08PM -0800, Sukadev Bhattiprolu wrote:
> +unsigned long kvmppc_h_svm_init_abort(struct kvm *kvm)
> +{
> +	int i;
> +
> +	if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
> +		return H_UNSUPPORTED;
> +
> +	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
> +		struct kvm_memory_slot *memslot;
> +		struct kvm_memslots *slots = __kvm_memslots(kvm, i);
> +
> +		if (!slots)
> +			continue;
> +
> +		kvm_for_each_memslot(memslot, slots)
> +			kvmppc_uvmem_drop_pages(memslot, kvm, false);
> +	}

You need to hold srcu_read_lock(&kvm->srcu) here.

Regards,
Bharata.