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Thu, 20 Jun 2019 14:40:37 +0000 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Thu, 20 Jun 2019 07:40:44 -0700 From: Kirti Wankhede To: , Date: Thu, 20 Jun 2019 20:07:35 +0530 Message-ID: <1561041461-22326-8-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1561041461-22326-1-git-send-email-kwankhede@nvidia.com> References: <1561041461-22326-1-git-send-email-kwankhede@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1561041644; bh=0qYiyk3jmnAKM28P+YXeeo6B7Cpq1ljyPZK55UqIrn8=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=ms/G2SMpmzMM3t45JGrNC2wvIKoSW6WHUQCmGrU9J4NbiuAJqyE7Tej2PwuAHUc9h EcOLFpJ7yzzfiHQoOwVKyKqKyzm/549FZiMAOEu/sJUdsFSrJe95kE3gFzt+aDsE5N o4hRmqJAxnmEsWUYEwzDB6FZX3oJKSD9bGlcQuyUwNR95LcLDpk1snzS9pQA0Bze0K yM3yFW4Y61GzltY5+rJdmemItt9arXc55cXsUN5DanAXY/McJvmi6ljrWo5+gy+hop 5iqymSbT2NEONyWv8L65oEbK0SkGXkYFz3r1ai22aRJl63serd6l3R+whgNUh+OeWL d1GAZXMW4GyfQ== X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 X-Received-From: 216.228.121.143 Subject: [Qemu-devel] [PATCH v4 07/13] vfio: Register SaveVMHandlers for VFIO device X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kirti Wankhede , Zhengxiao.zx@Alibaba-inc.com, kevin.tian@intel.com, yi.l.liu@intel.com, yan.y.zhao@intel.com, eskultet@redhat.com, ziye.yang@intel.com, qemu-devel@nongnu.org, cohuck@redhat.com, shuangtai.tst@alibaba-inc.com, dgilbert@redhat.com, zhi.a.wang@intel.com, mlevitsk@redhat.com, pasic@linux.ibm.com, aik@ozlabs.ru, yulei.zhang@intel.com, eauger@redhat.com, felipe@nutanix.com, jonathan.davies@nutanix.com, changpeng.liu@intel.com, Ken.Xue@amd.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Define flags to be used as delimeter in migration file stream. Added .save_setup and .save_cleanup functions. Mapped & unmapped migration region from these functions at source during saving or pre-copy phase. Set VFIO device state depending on VM's state. During live migration, VM is running when .save_setup is called, _SAVING | _RUNNING state is set for VFIO device. During save-restore, VM is paused, _SAVING state is set for VFIO de= vice. Signed-off-by: Kirti Wankhede Reviewed-by: Neo Jia --- hw/vfio/migration.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++= +++- 1 file changed, 75 insertions(+), 1 deletion(-) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 7f9858e6c995..fe0887c27664 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -22,6 +22,17 @@ #include "exec/ram_addr.h" #include "pci.h" =20 +/* + * Flags used as delimiter: + * 0xffffffff =3D> MSB 32-bit all 1s + * 0xef10 =3D> emulated (virtual) function IO + * 0x0000 =3D> 16-bits reserved for flags + */ +#define VFIO_MIG_FLAG_END_OF_STATE (0xffffffffef100001ULL) +#define VFIO_MIG_FLAG_DEV_CONFIG_STATE (0xffffffffef100002ULL) +#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL) +#define VFIO_MIG_FLAG_DEV_DATA_STATE (0xffffffffef100004ULL) + static void vfio_migration_region_exit(VFIODevice *vbasedev) { VFIOMigration *migration =3D vbasedev->migration; @@ -96,6 +107,69 @@ static int vfio_migration_set_state(VFIODevice *vbasede= v, uint32_t state) return 0; } =20 +/* ---------------------------------------------------------------------- = */ + +static int vfio_save_setup(QEMUFile *f, void *opaque) +{ + VFIODevice *vbasedev =3D opaque; + VFIOMigration *migration =3D vbasedev->migration; + int ret; + + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE); + + if (migration->region.buffer.mmaps) { + qemu_mutex_lock_iothread(); + ret =3D vfio_region_mmap(&migration->region.buffer); + qemu_mutex_unlock_iothread(); + if (ret) { + error_report("Failed to mmap VFIO migration region %d: %s", + migration->region.index, strerror(-ret)); + return ret; + } + } + + if (vbasedev->vm_running) { + ret =3D vfio_migration_set_state(vbasedev, + VFIO_DEVICE_STATE_RUNNING | VFIO_DEVICE_STATE_SAV= ING); + if (ret) { + error_report("Failed to set state RUNNING and SAVING"); + return ret; + } + } else { + ret =3D vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_SAVIN= G); + if (ret) { + error_report("Failed to set state STOP and SAVING"); + return ret; + } + } + + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE); + + ret =3D qemu_file_get_error(f); + if (ret) { + return ret; + } + + return 0; +} + +static void vfio_save_cleanup(void *opaque) +{ + VFIODevice *vbasedev =3D opaque; + VFIOMigration *migration =3D vbasedev->migration; + + if (migration->region.buffer.mmaps) { + vfio_region_unmap(&migration->region.buffer); + } +} + +static SaveVMHandlers savevm_vfio_handlers =3D { + .save_setup =3D vfio_save_setup, + .save_cleanup =3D vfio_save_cleanup, +}; + +/* ---------------------------------------------------------------------- = */ + static void vfio_vmstate_change(void *opaque, int running, RunState state) { VFIODevice *vbasedev =3D opaque; @@ -169,7 +243,7 @@ static int vfio_migration_init(VFIODevice *vbasedev, } =20 qemu_mutex_init(&vbasedev->migration->lock); - + register_savevm_live(NULL, "vfio", -1, 1, &savevm_vfio_handlers, vbase= dev); vbasedev->vm_state =3D qemu_add_vm_change_state_handler(vfio_vmstate_c= hange, vbasedev); =20 --=20 2.7.0