linux-kernel - Re: [PATCH linux-next] vfio: make vfio run on s390

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Date:	Mon, 10 Nov 2014 17:08:02 -0700
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Frank Blaschka <blaschka@...ux.vnet.ibm.com>
Cc:	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	Frank Blaschka <frank.blaschka@...ibm.com>
Subject: Re: [PATCH linux-next] vfio: make vfio run on s390

On Tue, 2014-11-04 at 13:10 +0100, Frank Blaschka wrote:
> From: Frank Blaschka <frank.blaschka@...ibm.com>
> 
> add Kconfig switch to hide INTx
> add Kconfig switch to let vfio announce PCI BARs are not mapable
> 
> Signed-off-by: Frank Blaschka <frank.blaschka@...ibm.com>
> ---

Thanks Frank, this looks good to me.  I'll queue it up in my next branch
in the next couple days.  Thanks,

Alex

>  drivers/vfio/Kconfig               | 2 +-
>  drivers/vfio/pci/Kconfig           | 8 ++++++++
>  drivers/vfio/pci/vfio_pci.c        | 5 +++--
>  drivers/vfio/pci/vfio_pci_config.c | 7 +++++++
>  4 files changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
> index d8c5763..b93c259 100644
> --- a/drivers/vfio/Kconfig
> +++ b/drivers/vfio/Kconfig
> @@ -16,7 +16,7 @@ config VFIO_SPAPR_EEH
>  menuconfig VFIO
>  	tristate "VFIO Non-Privileged userspace driver framework"
>  	depends on IOMMU_API
> -	select VFIO_IOMMU_TYPE1 if X86
> +	select VFIO_IOMMU_TYPE1 if (X86 || S390)
>  	select VFIO_IOMMU_SPAPR_TCE if (PPC_POWERNV || PPC_PSERIES)
>  	select VFIO_SPAPR_EEH if (PPC_POWERNV || PPC_PSERIES)
>  	select ANON_INODES
> diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
> index c41b01e..c6bb5da 100644
> --- a/drivers/vfio/pci/Kconfig
> +++ b/drivers/vfio/pci/Kconfig
> @@ -16,3 +16,11 @@ config VFIO_PCI_VGA
>  	  BIOS and generic video drivers.
>  
>  	  If you don't know what to do here, say N.
> +
> +config VFIO_PCI_MMAP
> +	depends on VFIO_PCI
> +	def_bool y if !S390
> +
> +config VFIO_PCI_INTX
> +	depends on VFIO_PCI
> +	def_bool y if !S390
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index 9558da3..255201f 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -215,7 +215,7 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
>  	if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
>  		u8 pin;
>  		pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
> -		if (pin)
> +		if (IS_ENABLED(CONFIG_VFIO_PCI_INTX) && pin)
>  			return 1;
>  
>  	} else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
> @@ -406,7 +406,8 @@ static long vfio_pci_ioctl(void *device_data,
>  
>  			info.flags = VFIO_REGION_INFO_FLAG_READ |
>  				     VFIO_REGION_INFO_FLAG_WRITE;
> -			if (pci_resource_flags(pdev, info.index) &
> +			if (IS_ENABLED(CONFIG_VFIO_PCI_MMAP) &&
> +			    pci_resource_flags(pdev, info.index) &
>  			    IORESOURCE_MEM && info.size >= PAGE_SIZE)
>  				info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
>  			break;
> diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
> index 1de3f94..ff75ca3 100644
> --- a/drivers/vfio/pci/vfio_pci_config.c
> +++ b/drivers/vfio/pci/vfio_pci_config.c
> @@ -609,6 +609,10 @@ static int __init init_pci_cap_basic_perm(struct perm_bits *perm)
>  
>  	/* Sometimes used by sw, just virtualize */
>  	p_setb(perm, PCI_INTERRUPT_LINE, (u8)ALL_VIRT, (u8)ALL_WRITE);
> +
> +	/* Virtualize interrupt pin to allow hiding INTx */
> +	p_setb(perm, PCI_INTERRUPT_PIN, (u8)ALL_VIRT, (u8)NO_WRITE);
> +
>  	return 0;
>  }
>  
> @@ -1445,6 +1449,9 @@ int vfio_config_init(struct vfio_pci_device *vdev)
>  		*(__le16 *)&vconfig[PCI_DEVICE_ID] = cpu_to_le16(pdev->device);
>  	}
>  
> +	if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX))
> +		vconfig[PCI_INTERRUPT_PIN] = 0;
> +
>  	ret = vfio_cap_init(vdev);
>  	if (ret)
>  		goto out;



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