On 6/23/2022 3:22 PM, Joerg Roedel wrote:
On Wed, Jun 22, 2022 at 12:11:25PM -0500, Suravee Suthikulpanit wrote:#ifdef CONFIG_IRQ_REMAP +/* + * Iterate through all the IOMMUs to verify if the specified + * EFR bitmask of IOMMU feature are set. + * Warn and return false if found inconsistency. + */ static bool check_feature_on_all_iommus(u64 mask) { bool ret = false; struct amd_iommu *iommu;for_each_iommu(iommu) {- ret = iommu_feature(iommu, mask); - if (!ret) + bool tmp = iommu_feature(iommu, mask); + + if ((ret != tmp) && + !list_is_first(&iommu->list, &amd_iommu_list)) { + pr_err(FW_BUG "Found inconsistent EFR mask (%#llx) on iommu%d (%04x:%02x:%02x.%01x).\n", + mask, iommu->index, iommu->pci_seg->id, PCI_BUS_NUM(iommu->devid), + PCI_SLOT(iommu->devid), PCI_FUNC(iommu->devid)); return false; + } + ret = tmp;It is better to implement this by introducing a global feature mask, which represents the minial set of features supported by any IOMMU in the system. The warning is then something like: if ((global_feature_mask & iommu_features) != global_feature_mask) pr_warn(...); This also makes the global variable to track SNP support obsolete. Regards, Joerg
That's actually better. I'll send out v4 w/ global EFR variable. Thanks, Suravee _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
