2020-07-30 00:14:54

by Jacob Pan

Subject: [PATCH v7 3/7] iommu/uapi: Introduce enum type for PASID data format

There can be multiple vendor-specific PASID data formats used in UAPI
structures. This patch adds enum type with a last entry which makes
range checking much easier.

Suggested-by: Alex Williamson <[email protected]>
Signed-off-by: Jacob Pan <[email protected]>
---
include/uapi/linux/iommu.h | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
index d5e9014f690e..abf4455a3495 100644
--- a/include/uapi/linux/iommu.h
+++ b/include/uapi/linux/iommu.h
@@ -294,11 +294,16 @@ struct iommu_gpasid_bind_data_vtd {
IOMMU_SVA_VTD_GPASID_PCD | \
IOMMU_SVA_VTD_GPASID_PWT)

+enum iommu_pasid_data_format {
+ IOMMU_PASID_FORMAT_INTEL_VTD = 1,
+ IOMMU_PASID_FORMAT_LAST,
+};
+
/**
* struct iommu_gpasid_bind_data - Information about device and guest PASID binding
* @argsz: User filled size of this data
* @version: Version of this data structure
- * @format: PASID table entry format
+ * @format: PASID table entry format of enum iommu_pasid_data_format type
* @flags: Additional information on guest bind request
* @gpgd: Guest page directory base of the guest mm to bind
* @hpasid: Process address space ID used for the guest mm in host IOMMU
@@ -317,7 +322,6 @@ struct iommu_gpasid_bind_data {
__u32 argsz;
#define IOMMU_GPASID_BIND_VERSION_1 1
__u32 version;
-#define IOMMU_PASID_FORMAT_INTEL_VTD 1
__u32 format;
__u32 addr_width;
#define IOMMU_SVA_GPASID_VAL (1 << 0) /* guest PASID valid */
--
2.7.4

2020-08-13 09:30:16

by Eric Auger

Subject: Re: [PATCH v7 3/7] iommu/uapi: Introduce enum type for PASID data format

Hi Jacob,

On 7/30/20 2:21 AM, Jacob Pan wrote:
> There can be multiple vendor-specific PASID data formats used in UAPI
> structures. This patch adds enum type with a last entry which makes
> range checking much easier.
>
> Suggested-by: Alex Williamson <[email protected]>
> Signed-off-by: Jacob Pan <[email protected]>
> ---
> include/uapi/linux/iommu.h | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
> index d5e9014f690e..abf4455a3495 100644
> --- a/include/uapi/linux/iommu.h
> +++ b/include/uapi/linux/iommu.h
> @@ -294,11 +294,16 @@ struct iommu_gpasid_bind_data_vtd {
> IOMMU_SVA_VTD_GPASID_PCD | \
> IOMMU_SVA_VTD_GPASID_PWT)
>
> +enum iommu_pasid_data_format {
> + IOMMU_PASID_FORMAT_INTEL_VTD = 1,
> + IOMMU_PASID_FORMAT_LAST,
> +};
> +
> /**
> * struct iommu_gpasid_bind_data - Information about device and guest PASID binding
> * @argsz: User filled size of this data
> * @version: Version of this data structure
> - * @format: PASID table entry format
> + * @format: PASID table entry format of enum iommu_pasid_data_format type
> * @flags: Additional information on guest bind request
> * @gpgd: Guest page directory base of the guest mm to bind
> * @hpasid: Process address space ID used for the guest mm in host IOMMU
> @@ -317,7 +322,6 @@ struct iommu_gpasid_bind_data {
> __u32 argsz;
> #define IOMMU_GPASID_BIND_VERSION_1 1
> __u32 version;
> -#define IOMMU_PASID_FORMAT_INTEL_VTD 1
> __u32 format;
> __u32 addr_width;
> #define IOMMU_SVA_GPASID_VAL (1 << 0) /* guest PASID valid */
>
Reviewed-by: Eric Auger <[email protected]>

Eric