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Re: [PATCH v2 04/23] xen/arm: vIOMMU: add generic vIOMMU framework
- To: Milan Djokic <milan_djokic@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 24 Mar 2026 09:48:01 +0100
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- Cc: Rahul Singh <rahul.singh@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 24 Mar 2026 08:48:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 23.03.2026 23:51, Milan Djokic wrote:
> --- a/xen/include/public/arch-arm.h
> +++ b/xen/include/public/arch-arm.h
> @@ -330,12 +330,16 @@ DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
> #define XEN_DOMCTL_CONFIG_ARM_SCI_NONE 0
> #define XEN_DOMCTL_CONFIG_ARM_SCI_SCMI_SMC 1
>
> +#define XEN_DOMCTL_CONFIG_VIOMMU_NONE 0
> +
> struct xen_arch_domainconfig {
> /* IN/OUT */
> uint8_t gic_version;
> /* IN - Contains SVE vector length divided by 128 */
> uint8_t sve_vl;
> /* IN */
> + uint8_t viommu_type;
> + /* IN */
> uint16_t tee_type;
> /* IN */
> uint32_t nr_spis;
You're altering structure layout, and hence an interface version change is
needed. Adding at the end would be less intrusive (no real change to layout),
but still would require an interface version bump due to the lack of
checking that the 3 padding bytes are actually 0. (IOW to help future
changes, you may want to add explicit padding bytes along with the new field
you need, and check them to be zero.)
Jan
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