From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41469) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZvAW-0000Mo-34 for qemu-devel@nongnu.org; Fri, 12 Jan 2018 03:58:37 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eZvAV-0004hz-9K for qemu-devel@nongnu.org; Fri, 12 Jan 2018 03:58:32 -0500 From: Fam Zheng Date: Fri, 12 Jan 2018 16:55:51 +0800 Message-Id: <20180112085555.14447-6-famz@redhat.com> In-Reply-To: <20180112085555.14447-1-famz@redhat.com> References: <20180112085555.14447-1-famz@redhat.com> Subject: [Qemu-devel] [PATCH v5 5/9] block/nvme: Implement .bdrv_(un)register_buf List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Keith Busch , qemu-block@nongnu.org, Fam Zheng , Kevin Wolf , Max Reitz , Eric Blake , alex.williamson@redhat.com, Markus Armbruster , Stefan Hajnoczi , Karl Rister Forward these two calls to the IOVA manager. Signed-off-by: Fam Zheng Message-Id: <20180110091846.10699-6-famz@redhat.com> Reviewed-by: Stefan Hajnoczi --- block/nvme.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/block/nvme.c b/block/nvme.c index 97ab01686f..a786f9e094 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -1128,6 +1128,27 @@ static void nvme_aio_unplug(BlockDriverState *bs) } } +static void nvme_register_buf(BlockDriverState *bs, void *host, size_t size) +{ + int ret; + BDRVNVMeState *s = bs->opaque; + + ret = qemu_vfio_dma_map(s->vfio, host, size, false, NULL); + if (ret) { + /* FIXME: we may run out of IOVA addresses after repeated + * bdrv_register_buf/bdrv_unregister_buf, because nvme_vfio_dma_unmap + * doesn't reclaim addresses for fixed mappings. */ + error_report("nvme_register_buf failed: %s", strerror(-ret)); + } +} + +static void nvme_unregister_buf(BlockDriverState *bs, void *host) +{ + BDRVNVMeState *s = bs->opaque; + + qemu_vfio_dma_unmap(s->vfio, host); +} + static BlockDriver bdrv_nvme = { .format_name = "nvme", .protocol_name = "nvme", @@ -1153,6 +1174,9 @@ static BlockDriver bdrv_nvme = { .bdrv_io_plug = nvme_aio_plug, .bdrv_io_unplug = nvme_aio_unplug, + + .bdrv_register_buf = nvme_register_buf, + .bdrv_unregister_buf = nvme_unregister_buf, }; static void bdrv_nvme_init(void) -- 2.14.3