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Tsirkin" , Marcel Apfelbaum , =?utf-8?Q?Daniel_P_=2E_Berrang=C3=A9?= , Eduardo Habkost , Jon Maloy , Siqi Chen Subject: Re: [PATCH v6 0/4] memory: prevent dma-reentracy issues In-Reply-To: <20230205040737.3567731-1-alxndr@bu.edu> References: <20230205040737.3567731-1-alxndr@bu.edu> Date: Mon, 13 Feb 2023 14:58:13 +0000 Message-ID: Content-Type: text/plain X-ClientProxiedBy: DB6P18901CA0006.EURP189.PROD.OUTLOOK.COM (2603:10a6:4:16::16) To BLAPR10MB5138.namprd10.prod.outlook.com (2603:10b6:208:322::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BLAPR10MB5138:EE_|MN0PR10MB5958:EE_ X-MS-Office365-Filtering-Correlation-Id: a797124d-4f8a-4b44-8ac9-08db0dd2be02 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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envelope-from=darren.kenny@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Hi Alex, Everything looks good to me, I don't have anything else to add: Reviewed-by: Darren Kenny Thanks, Darren. On Saturday, 2023-02-04 at 23:07:33 -05, Alexander Bulekov wrote: > These patches aim to solve two types of DMA-reentrancy issues: > > 1.) mmio -> dma -> mmio case > To solve this, we track whether the device is engaged in io by > checking/setting a reentrancy-guard within APIs used for MMIO access. > > 2.) bh -> dma write -> mmio case > This case is trickier, since we dont have a generic way to associate a > bh with the underlying Device/DeviceState. Thus, this version allows a > device to associate a reentrancy-guard with a bh, when creating it. > (Instead of calling qemu_bh_new, you call qemu_bh_new_guarded) > > I replaced most of the qemu_bh_new invocations with the guarded analog, > except for the ones where the DeviceState was not trivially accessible. > > v5 -> v6: > - Only apply checkpatch checks to code in paths containing "/hw/" > (/hw/ and include/hw/) > - Fix a bug in a _guarded call added to hw/block/virtio-blk.c > v4-> v5: > - Add corresponding checkpatch checks > - Save/restore reentrancy-flag when entering/exiting BHs > - Improve documentation > - Check object_dynamic_cast return value > > v3 -> v4: Instead of changing all of the DMA APIs, instead add an > optional reentrancy guard to the BH API. > > v2 -> v3: Bite the bullet and modify the DMA APIs, rather than > attempting to guess DeviceStates in BHs. > > Alexander Bulekov (4): > memory: prevent dma-reentracy issues > async: Add an optional reentrancy guard to the BH API > checkpatch: add qemu_bh_new/aio_bh_new checks > hw: replace most qemu_bh_new calls with qemu_bh_new_guarded > > docs/devel/multiple-iothreads.txt | 7 +++++++ > hw/9pfs/xen-9p-backend.c | 4 +++- > hw/block/dataplane/virtio-blk.c | 3 ++- > hw/block/dataplane/xen-block.c | 5 +++-- > hw/char/virtio-serial-bus.c | 3 ++- > hw/display/qxl.c | 9 ++++++--- > hw/display/virtio-gpu.c | 6 ++++-- > hw/ide/ahci.c | 3 ++- > hw/ide/core.c | 3 ++- > hw/misc/imx_rngc.c | 6 ++++-- > hw/misc/macio/mac_dbdma.c | 2 +- > hw/net/virtio-net.c | 3 ++- > hw/nvme/ctrl.c | 6 ++++-- > hw/scsi/mptsas.c | 3 ++- > hw/scsi/scsi-bus.c | 3 ++- > hw/scsi/vmw_pvscsi.c | 3 ++- > hw/usb/dev-uas.c | 3 ++- > hw/usb/hcd-dwc2.c | 3 ++- > hw/usb/hcd-ehci.c | 3 ++- > hw/usb/hcd-uhci.c | 2 +- > hw/usb/host-libusb.c | 6 ++++-- > hw/usb/redirect.c | 6 ++++-- > hw/usb/xen-usb.c | 3 ++- > hw/virtio/virtio-balloon.c | 5 +++-- > hw/virtio/virtio-crypto.c | 3 ++- > include/block/aio.h | 18 ++++++++++++++++-- > include/hw/qdev-core.h | 7 +++++++ > include/qemu/main-loop.h | 7 +++++-- > scripts/checkpatch.pl | 8 ++++++++ > softmmu/memory.c | 17 +++++++++++++++++ > softmmu/trace-events | 1 + > tests/unit/ptimer-test-stubs.c | 3 ++- > util/async.c | 18 +++++++++++++++++- > util/main-loop.c | 5 +++-- > util/trace-events | 1 + > 35 files changed, 147 insertions(+), 41 deletions(-) > > -- > 2.39.0