linux-kernel - Re: [PATCH v8 17/18] vfio/type1: Check MSI remapping at irq domain level

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Date:   Fri, 13 Jan 2017 16:04:59 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, christoffer.dall@...aro.org,
        marc.zyngier@....com, robin.murphy@....com, will.deacon@....com,
        joro@...tes.org, tglx@...utronix.de, jason@...edaemon.net,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        drjones@...hat.com, linux-kernel@...r.kernel.org,
        pranav.sawargaonkar@...il.com, iommu@...ts.linux-foundation.org,
        punit.agrawal@....com, diana.craciun@....com, gpkulkarni@...il.com,
        shankerd@...eaurora.org, bharat.bhushan@....com,
        geethasowjanya.akula@...il.com
Subject: Re: [PATCH v8 17/18] vfio/type1: Check MSI remapping at irq domain
 level

On Wed, 11 Jan 2017 09:41:53 +0000
Eric Auger <eric.auger@...hat.com> wrote:

> In case the IOMMU translates MSI transactions (typical case
> on ARM), we check MSI remapping capability at IRQ domain
> level. Otherwise it is checked at IOMMU level.
> 
> At this stage the arm-smmu-(v3) still advertise the
> IOMMU_CAP_INTR_REMAP capability at IOMMU level. This will be
> removed in subsequent patches.
> 
> Signed-off-by: Eric Auger <eric.auger@...hat.com>


Acked-by: Alex Williamson <alex.williamson@...hat.com>

 
> ---
> 
> v6: rewrite test
> ---
>  drivers/vfio/vfio_iommu_type1.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index 5651faf..ec903a0 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -40,6 +40,7 @@
>  #include <linux/mdev.h>
>  #include <linux/notifier.h>
>  #include <linux/dma-iommu.h>
> +#include <linux/irqdomain.h>
>  
>  #define DRIVER_VERSION  "0.2"
>  #define DRIVER_AUTHOR   "Alex Williamson <alex.williamson@...hat.com>"
> @@ -1212,7 +1213,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
>  	struct vfio_domain *domain, *d;
>  	struct bus_type *bus = NULL, *mdev_bus;
>  	int ret;
> -	bool resv_msi;
> +	bool resv_msi, msi_remap;
>  	phys_addr_t resv_msi_base;
>  
>  	mutex_lock(&iommu->lock);
> @@ -1288,8 +1289,10 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
>  	INIT_LIST_HEAD(&domain->group_list);
>  	list_add(&group->next, &domain->group_list);
>  
> -	if (!allow_unsafe_interrupts &&
> -	    !iommu_capable(bus, IOMMU_CAP_INTR_REMAP)) {
> +	msi_remap = resv_msi ? irq_domain_check_msi_remap() :
> +				iommu_capable(bus, IOMMU_CAP_INTR_REMAP);
> +
> +	if (!allow_unsafe_interrupts && !msi_remap) {
>  		pr_warn("%s: No interrupt remapping support.  Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
>  		       __func__);
>  		ret = -EPERM;