linux-kernel - Re: [PATCH v2 12/30] s390/pci: get SHM information from list pci

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Date:   Thu, 27 Jan 2022 11:29:02 +0100
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc:     alex.williamson@...hat.com, cohuck@...hat.com,
        farman@...ux.ibm.com, pmorel@...ux.ibm.com,
        borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        frankja@...ux.ibm.com, david@...hat.com, imbrenda@...ux.ibm.com,
        vneethv@...ux.ibm.com, oberpar@...ux.ibm.com, freude@...ux.ibm.com,
        thuth@...hat.com, pasic@...ux.ibm.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 12/30] s390/pci: get SHM information from list pci

On Fri, 2022-01-14 at 15:31 -0500, Matthew Rosato wrote:
> KVM will need information on the special handle mask used to indicate
> emulated devices.  In order to obtain this, a new type of list pci call
> must be made to gather the information.  Extend clp_list_pci_req to
> also fetch the model-dependent-data field that holds this mask.
> 
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> ---
>  arch/s390/include/asm/pci.h     |  1 +
>  arch/s390/include/asm/pci_clp.h |  2 +-
>  arch/s390/pci/pci_clp.c         | 28 +++++++++++++++++++++++++---
>  3 files changed, 27 insertions(+), 4 deletions(-)
> 
---8<---
>  
> +int zpci_get_mdd(u32 *mdd)
> +{
> +	struct clp_req_rsp_list_pci *rrb;
> +	u64 resume_token = 0;
> +	int nentries, rc;
> +
> +	if (!mdd)
> +		return -EINVAL;
> +
> +	rrb = clp_alloc_block(GFP_KERNEL);
> +	if (!rrb)
> +		return -ENOMEM;
> +
> +	rc = clp_list_pci_req(rrb, &resume_token, &nentries, mdd);
> +
> +	clp_free_block(rrb);
> +	return rc;
> +}
> +EXPORT_SYMBOL_GPL(zpci_get_mdd);
> +
>  static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
>  {
>  	unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);

Looks good.

Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>