Re: [PATCH v3 06/14] iommufd: Add IOMMUFD_OBJ_VIRQ and IOMMUFD_CMD_VIRQ_ALLOC
From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2025-01-02 20:52:53
Also in:
linux-doc, linux-iommu, linux-kselftest, linux-patches, lkml
On Tue, Dec 17, 2024 at 09:00:19PM -0800, Nicolin Chen wrote:
+/* An iommufd_virq_header packs a vIOMMU interrupt in an iommufd_virq queue */
+struct iommufd_virq_header {
+ struct list_head node;
+ ssize_t irq_len;
+ void *irq_data;
+};
Based on how it is used in iommufd_viommu_report_irq()
+ header = kzalloc(sizeof(*header) + irq_len, GFP_KERNEL);
+ header->irq_data = (void *)header + sizeof(*header);
+ memcpy(header->irq_data, irq_ptr, irq_len);
It should be a flex array and use the various flexarray tools
struct iommufd_virq_header {
ssize_t irq_len;
u64 irq_data[] __counted_by(irq_len);
}
Jason