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AJvYcCWMpvKSMVauy3X4Pj/YZfpdDYCU9fhGqrV2rIzQGpbb8URs/h8I9OmPoyuA0WysliVKZZy96RDLrvOGl2uU5O4=@vger.kernel.org X-Gm-Message-State: AOJu0Yz7Tgit4+8EXSpySVbWPN1wZJpl2tGI9JSY5YtR7ez+NliDl/KX 0LiwbOdPrLnprCBqlkLtI8oRXJ+f2E5gaKov/x9fmhBhppa3LbcQk+0PWYGIXnxDkhQHRvGmA2C hWpHXo47G6A== X-Google-Smtp-Source: AGHT+IGvT4gSxZumpaRuwK33oT1VTteqUw6nohwluWluZWlr9C8TOLWOTIAP6j/iKx3fcI6xg3+HQZq1UcLw X-Received: from pjre17.prod.google.com ([2002:a17:90a:b391:b0:33b:51fe:1a89]) (user=vipinsh job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:180e:b0:32e:73fd:81a3 with SMTP id 98e67ed59e1d1-33bcf93dfbdmr7878362a91.33.1760746062232; Fri, 17 Oct 2025 17:07:42 -0700 (PDT) Date: Fri, 17 Oct 2025 17:07:03 -0700 In-Reply-To: <20251018000713.677779-1-vipinsh@google.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251018000713.677779-1-vipinsh@google.com> X-Mailer: git-send-email 2.51.0.858.gf9c4a03a3a-goog Message-ID: <20251018000713.677779-12-vipinsh@google.com> Subject: [RFC PATCH 11/21] vfio/pci: Skip clearing bus master on live update device during kexec From: Vipin Sharma To: bhelgaas@google.com, alex.williamson@redhat.com, pasha.tatashin@soleen.com, dmatlack@google.com, jgg@ziepe.ca, graf@amazon.com Cc: pratyush@kernel.org, gregkh@linuxfoundation.org, chrisl@kernel.org, rppt@kernel.org, skhawaja@google.com, parav@nvidia.com, saeedm@nvidia.com, kevin.tian@intel.com, jrhilke@google.com, david@redhat.com, jgowans@amazon.com, dwmw2@infradead.org, epetron@amazon.de, junaids@google.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Vipin Sharma Content-Type: text/plain; charset="UTF-8" Set skip_kexec_clear_master on live update prepare() so that the device participating in live update can continue to perform DMA during kexec phase. Signed-off-by: Vipin Sharma --- drivers/vfio/pci/vfio_pci_liveupdate.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/vfio/pci/vfio_pci_liveupdate.c b/drivers/vfio/pci/vfio_pci_liveupdate.c index 8e0ee01127b3..789b52665e35 100644 --- a/drivers/vfio/pci/vfio_pci_liveupdate.c +++ b/drivers/vfio/pci/vfio_pci_liveupdate.c @@ -54,6 +54,7 @@ static int vfio_pci_liveupdate_prepare(struct liveupdate_file_handler *handler, goto err_free_folio; *data = virt_to_phys(ser); + vdev->pdev->skip_kexec_clear_master = true; return 0; @@ -67,7 +68,12 @@ static void vfio_pci_liveupdate_cancel(struct liveupdate_file_handler *handler, { struct vfio_pci_core_device_ser *ser = phys_to_virt(data); struct folio *folio = virt_to_folio(ser); + struct vfio_pci_core_device *vdev; + struct vfio_device *device; + device = vfio_device_from_file(file); + vdev = container_of(device, struct vfio_pci_core_device, vdev); + vdev->pdev->skip_kexec_clear_master = false; WARN_ON_ONCE(kho_unpreserve_folio(folio)); folio_put(folio); } -- 2.51.0.858.gf9c4a03a3a-goog