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Mon, 25 May 2026 11:43:52 -0700 (PDT) Date: Mon, 25 May 2026 18:43:43 +0000 In-Reply-To: <20260525184347.4059549-1-praan@google.com> Mime-Version: 1.0 References: <20260525184347.4059549-1-praan@google.com> X-Mailer: git-send-email 2.54.0.746.g67dd491aae-goog Message-ID: <20260525184347.4059549-2-praan@google.com> Subject: [PATCH v4 1/5] PCI/ATS: Ensure pci_ats_supported() is PF-aware for VFs From: Pranjal Shrivastava To: iommu@lists.linux.dev, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Joerg Roedel , Will Deacon , Bjorn Helgaas , David Woodhouse , Lu Baolu , Robin Murphy , Suravee Suthikulpanit , Jason Gunthorpe , Nicolin Chen , David Matlack , Samiullah Khawaja , Daniel Mentz , Pasha Tatashin , Mostafa Saleh , Pranjal Shrivastava , Jason Gunthorpe Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260525_114354_917837_B9232784 X-CRM114-Status: GOOD ( 11.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Update pci_ats_supported() to additionally check the associated PF's status when called on a VF. This ensures that PF-level quirks and untrusted status are correctly propagated to VFs, providing a robust support check that aligns with the kernel's PF-centric ATS configuration model and is immune to the timing of VF-specific fixups. Reviewed-by: Jason Gunthorpe Reviewed-by: Samiullah Khawaja Signed-off-by: Pranjal Shrivastava --- drivers/pci/ats.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index ec6c8dbdc5e9..a5fa7745bce8 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -40,10 +40,13 @@ void pci_ats_init(struct pci_dev *dev) */ bool pci_ats_supported(struct pci_dev *dev) { - if (!dev->ats_cap) + if (!dev->ats_cap || dev->untrusted) return false; - return (dev->untrusted == 0); + if (dev->is_virtfn) + return pci_ats_supported(pci_physfn(dev)); + + return true; } EXPORT_SYMBOL_GPL(pci_ats_supported); -- 2.54.0.746.g67dd491aae-goog