Date: Thu, 23 May 2019 18:58:33 +0000 From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 231117] bhyve: I/O lockups inside guests Message-ID: <bug-231117-27103-8ZLyVJWFCE@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-231117-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-231117-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D231117 --- Comment #29 from commit-hook@freebsd.org --- A commit references this bug: Author: rgrimes Date: Thu May 23 18:58:06 UTC 2019 New revision: 348188 URL: https://svnweb.freebsd.org/changeset/base/348188 Log: MFC: r347960: bhyve virtio needs barriers Under certain tight race conditions, we found that the lack of a memory barrier in bhyve's virtio handling causes it to miss a NO_NOTIFY state transition on block devices, resulting in guest stall. The investigation is recorded in OS-7613. As part of the examination into bhyve's use of barriers, one other section was found to be problematic, but only on non-x86 ISAs with less strict memory ordering. That was addressed in this patch as well, although it was not at all a problem on x86. PR: 231117 Submitted by: Patrick Mooney <patrick.mooney@joyent.com> Reviewed by: jhb, kib, rgrimes Approved by: re (gjb), jhb Differential Revision: https://reviews.freebsd.org/D19501 Changes: _U stable/11/ stable/11/usr.sbin/bhyve/virtio.c --=20 You are receiving this mail because: You are the assignee for the bug.=
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