linux-kernel - Re: [RFC PATCH v1 35/38] coco: guest: arm64: Add Realm device start and stop support

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Message-ID: <20250731114032.00007c72@huawei.com>
Date: Thu, 31 Jul 2025 11:40:32 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
CC: <linux-coco@...ts.linux.dev>, <kvmarm@...ts.linux.dev>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <aik@....com>,
	<lukas@...ner.de>, Samuel Ortiz <sameo@...osinc.com>, Xu Yilun
	<yilun.xu@...ux.intel.com>, Jason Gunthorpe <jgg@...pe.ca>, "Suzuki K
 Poulose" <Suzuki.Poulose@....com>, Steven Price <steven.price@....com>,
	Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
	Will Deacon <will@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>
Subject: Re: [RFC PATCH v1 35/38] coco: guest: arm64: Add Realm device start
 and stop support

On Mon, 28 Jul 2025 19:22:12 +0530
"Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org> wrote:

> Writing 1 to 'tsm/acceept' will initiate the TDISP RUN sequence.
> 
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>

A few more trivial things on this first read through.

Jonathan

> diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.c b/drivers/virt/coco/arm-cca-guest/rsi-da.c
> index 936f844880de..64034d220e02 100644
> --- a/drivers/virt/coco/arm-cca-guest/rsi-da.c
> +++ b/drivers/virt/coco/arm-cca-guest/rsi-da.c

> +int rsi_device_stop(struct pci_dev *pdev)
> +{
> +	int ret;
> +	struct cca_guest_dsc *dsm = to_cca_guest_dsc(pdev);
> +	int vdev_id = (pci_domain_nr(pdev->bus) << 16) |
> +		PCI_DEVID(pdev->bus->number, pdev->devfn);

Feels like this occurs so often we should add a helper.
Can't be completely generic as pci_domain_nr can have more bits
than I guess we are assuming here, but we can have something for
use in the rsi code.


> +
> +	ret = rsi_rdev_stop(pdev, vdev_id, dsm->instance_id);
> +	if (ret != RSI_SUCCESS) {
> +		pci_err(pdev, "failed to stop the device (%u)\n", ret);
> +		return -EIO;
> +	}
>  	return 0;
>  }
> diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.h b/drivers/virt/coco/arm-cca-guest/rsi-da.h
> index 0d6e1c0ada4a..71ee1edb832e 100644
> --- a/drivers/virt/coco/arm-cca-guest/rsi-da.h
> +++ b/drivers/virt/coco/arm-cca-guest/rsi-da.h
> @@ -54,5 +54,5 @@ static inline struct cca_guest_dsc *to_cca_guest_dsc(struct pci_dev *pdev)
>  int rsi_update_interface_report(struct pci_dev *pdev, bool validate);
>  int rsi_device_lock(struct pci_dev *pdev);
>  int rsi_device_start(struct pci_dev *pdev);
> -

Tidy this up.

> +int rsi_device_stop(struct pci_dev *pdev);
>  #endif