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bh=403oEb4nMshaBr2VAMAZkkpkxyQZ3/0zt2xOM1yNz0I=; b=DqYBHv8JFrn04L28nsp1o4xPVQ1HONRAH8x0v1Z6Xx78ouwfpn2V/7snChANqAda29famt JA9XEs/xBGfDBJG7tkc/b3bIChKyKlTrJfy3pecf0HgkbpRcLAEw3rhTlMRJYYGNfY6r1d 3SmMM4YIPkXMnNKLBadGxbCmH6zjT/U= X-MC-Unique: 2s1HgUuXO_eevD_z1JFycQ-1 From: Juan Quintela To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , "Dr. David Alan Gilbert" , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Fam Zheng , Juan Quintela , qemu-block@nongnu.org, David Hildenbrand , Peter Xu , Paolo Bonzini Subject: [PULL 5/8] migration: Disallow postcopy preempt to be used with compress Date: Mon, 21 Nov 2022 13:59:04 +0100 Message-Id: <20221121125907.62469-6-quintela@redhat.com> In-Reply-To: <20221121125907.62469-1-quintela@redhat.com> References: <20221121125907.62469-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1669035597695100002 Content-Type: text/plain; charset="utf-8" From: Peter Xu The preempt mode requires the capability to assign channel for each of the page, while the compression logic will currently assign pages to different compress thread/local-channel so potentially they're incompatible. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- migration/migration.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/migration/migration.c b/migration/migration.c index 739bb683f3..f3ed77a7d0 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1337,6 +1337,17 @@ static bool migrate_caps_check(bool *cap_list, error_setg(errp, "Postcopy preempt requires postcopy-ram"); return false; } + + /* + * Preempt mode requires urgent pages to be sent in separate + * channel, OTOH compression logic will disorder all pages into + * different compression channels, which is not compatible with the + * preempt assumptions on channel assignments. + */ + if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) { + error_setg(errp, "Postcopy preempt not compatible with compres= s"); + return false; + } } =20 return true; --=20 2.38.1