From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47357) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eu1gR-0003HG-VU for qemu-devel@nongnu.org; Thu, 08 Mar 2018 14:58:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eu1gR-0006By-0F for qemu-devel@nongnu.org; Thu, 08 Mar 2018 14:58:36 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:41460 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eu1gQ-0006Bm-RN for qemu-devel@nongnu.org; Thu, 08 Mar 2018 14:58:34 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 47F508182D24 for ; Thu, 8 Mar 2018 19:58:34 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" Date: Thu, 8 Mar 2018 19:57:56 +0000 Message-Id: <20180308195811.24894-15-dgilbert@redhat.com> In-Reply-To: <20180308195811.24894-1-dgilbert@redhat.com> References: <20180308195811.24894-1-dgilbert@redhat.com> Subject: [Qemu-devel] [PATCH v4 14/29] libvhost-user+postcopy: Register new regions with the ufd List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, mst@redhat.com, maxime.coquelin@redhat.com, marcandre.lureau@redhat.com, peterx@redhat.com, quintela@redhat.com Cc: aarcange@redhat.com From: "Dr. David Alan Gilbert" When new regions are sent to the client using SET_MEM_TABLE, register them with the userfaultfd. Signed-off-by: Dr. David Alan Gilbert --- contrib/libvhost-user/libvhost-user.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/libvhost-user.c index 4922b2c722..a18bc74a7c 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -494,6 +494,40 @@ vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg) close(vmsg->fds[i]); } + /* TODO: Get address back to QEMU */ + for (i = 0; i < dev->nregions; i++) { + VuDevRegion *dev_region = &dev->regions[i]; +#ifdef UFFDIO_REGISTER + /* We should already have an open ufd. Mark each memory + * range as ufd. + * Note: Do we need any madvises? Well it's not been accessed + * yet, still probably need no THP to be safe, discard to be safe? + */ + struct uffdio_register reg_struct; + reg_struct.range.start = (uintptr_t)dev_region->mmap_addr; + reg_struct.range.len = dev_region->size + dev_region->mmap_offset; + reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING; + + if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER, ®_struct)) { + vu_panic(dev, "%s: Failed to userfault region %d " + "@%p + size:%zx offset: %zx: (ufd=%d)%s\n", + __func__, i, + dev_region->mmap_addr, + dev_region->size, dev_region->mmap_offset, + dev->postcopy_ufd, strerror(errno)); + return false; + } + if (!(reg_struct.ioctls & ((__u64)1 << _UFFDIO_COPY))) { + vu_panic(dev, "%s Region (%d) doesn't support COPY", + __func__, i); + return false; + } + DPRINT("%s: region %d: Registered userfault for %llx + %llx\n", + __func__, i, reg_struct.range.start, reg_struct.range.len); + /* TODO: Stash 'zero' support flags somewhere */ +#endif + } + return false; } -- 2.14.3