linux-kernel - Re: [PATCH v6 12/43] arm64: RME: Allocate/free RECs to match vCPUs

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Message-ID: <yq5apllos06l.fsf@kernel.org>
Date: Thu, 19 Dec 2024 11:07:22 +0530
From: Aneesh Kumar K.V <aneesh.kumar@...nel.org>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
	kvmarm@...ts.linux.dev
Cc: Steven Price <steven.price@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
	James Morse <james.morse@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Joey Gouly <joey.gouly@....com>,
	Alexandru Elisei <alexandru.elisei@....com>,
	Christoffer Dall <christoffer.dall@....com>,
	Fuad Tabba <tabba@...gle.com>, linux-coco@...ts.linux.dev,
	Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
	Gavin Shan <gshan@...hat.com>,
	Shanker Donthineni <sdonthineni@...dia.com>,
	Alper Gun <alpergun@...gle.com>
Subject: Re: [PATCH v6 12/43] arm64: RME: Allocate/free RECs to match vCPUs

Steven Price <steven.price@....com> writes:

> +static int alloc_rec_aux(struct page **aux_pages,
> +			 u64 *aux_phys_pages,
> +			 unsigned int num_aux)
> +{
> +	int ret;
> +	unsigned int i;
> +
> +	for (i = 0; i < num_aux; i++) {
> +		struct page *aux_page;
> +		phys_addr_t aux_page_phys;
> +
> +		aux_page = alloc_page(GFP_KERNEL);
> +		if (!aux_page) {
> +			ret = -ENOMEM;
> +			goto out_err;
> +		}
> +		aux_page_phys = page_to_phys(aux_page);
> +		if (rmi_granule_delegate(aux_page_phys)) {
> +			__free_page(aux_page);
> +			ret = -ENXIO;
> +			goto out_err;
> +		}
> +		aux_pages[i] = aux_page;
> +		aux_phys_pages[i] = aux_page_phys;
> +	}
> +
> +	return 0;
> +out_err:
> +	free_rec_aux(aux_pages, i);
> +	return ret;
> +}
>

We can possibly switch the above to the alloc/free helper so that all
granule allocation is done by alloc_delegated_granule() ?

static int alloc_rec_aux(struct realm *realm, u64 *aux_phys_pages, unsigned int num_aux)
{
	int ret;
	unsigned int i;

	for (i = 0; i < num_aux; i++) {
		phys_addr_t aux_page_phys;

		aux_page_phys = alloc_delegated_granule(realm, NULL, GFP_KERNEL);
		if (aux_page_phys == PHYS_ADDR_MAX) {
			ret = -ENOMEM;
			goto out_err;
		}
		aux_phys_pages[i] = aux_page_phys;
	}

	return 0;
out_err:
	free_rec_aux(realm, aux_phys_pages, i);
	return ret;
}