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charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2020/3/12 15:54, Jean-Philippe Brucker wrote: > Hi Baolu, > > On Thu, Mar 12, 2020 at 09:44:16AM +0800, Lu Baolu wrote: >> Hi Jean, >> >> On 2020/3/11 20:45, Jean-Philippe Brucker wrote: >>> The pci_ats_supported() function checks if a device supports ATS and is >>> allowed to use it. >>> >>> Signed-off-by: Jean-Philippe Brucker >>> --- >>> drivers/iommu/intel-iommu.c | 9 +++------ >>> 1 file changed, 3 insertions(+), 6 deletions(-) >>> >>> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c >>> index 6fa6de2b6ad5..17208280ef5c 100644 >>> --- a/drivers/iommu/intel-iommu.c >>> +++ b/drivers/iommu/intel-iommu.c >>> @@ -1454,8 +1454,7 @@ static void iommu_enable_dev_iotlb(struct device_domain_info *info) >>> !pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32)) >>> info->pri_enabled = 1; >>> #endif >>> - if (!pdev->untrusted && info->ats_supported && >>> - pci_ats_page_aligned(pdev) && >>> + if (info->ats_supported && pci_ats_page_aligned(pdev) && >>> !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) { >>> info->ats_enabled = 1; >>> domain_update_iotlb(info->domain); >>> @@ -2611,10 +2610,8 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu, >>> if (dev && dev_is_pci(dev)) { >>> struct pci_dev *pdev = to_pci_dev(info->dev); >>> - if (!pdev->untrusted && >>> - !pci_ats_disabled() && >> >> The pci_ats_disabled() couldn't be replaced by pci_ats_supported(). Even >> pci_ats_supported() returns true, user still can disable it. Or move >> ats_disabled into pci_ats_supported()? > > It is already there, but hidden behind the "if (!dev->ats_cap)": > pci_ats_init() only sets dev->ats_cap after checking that > pci_ats_disabled() returns false. > Ah! Yes. Acked-by: Lu Baolu > Thanks, > Jean Best regards, baolu _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel