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Tue, 13 Oct 2020 12:05:13 -0700 (PDT) From: Jason Andryuk To: qemu-devel@nongnu.org Cc: dgilbert@redhat.com, xen-devel@lists.xenproject.org, paul@xen.org, anthony.perard@citrix.com, sstabellini@kernel.org, Jason Andryuk , =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , "Michael S. Tsirkin" , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost Subject: [PATCH] hw/xen: Set suppress-vmdesc for Xen machines Date: Tue, 13 Oct 2020 15:05:06 -0400 Message-Id: <20201013190506.3325-1-jandryuk@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) xen-save-devices-state doesn't currently generate a vmdesc, so restore always triggers "Expected vmdescription section, but got 0". This is not a problem when restore comes from a file. However, when QEMU runs in a linux stubdom and comes over a console, EOF is not received. This causes a delay restoring - though it does restore. Setting suppress-vmdesc skips looking for the vmdesc during restore and avoids the wait. The other approach would be generate a vmdesc in qemu_save_device_state. Since COLO shared that function, and the vmdesc is just discarded on restore, we choose to skip it. Reported-by: Marek Marczykowski-G=C3=B3recki Signed-off-by: Jason Andryuk Acked-by: Anthony PERARD --- hw/i386/pc_piix.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index 3c2ae0612b..0cf22a57ad 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -987,7 +987,7 @@ static void xenfv_4_2_machine_options(MachineClass *m) pc_i440fx_4_2_machine_options(m); m->desc =3D "Xen Fully-virtualized PC"; m->max_cpus =3D HVM_MAX_VCPUS; - m->default_machine_opts =3D "accel=3Dxen"; + m->default_machine_opts =3D "accel=3Dxen,suppress-vmdesc=3Don"; } =20 DEFINE_PC_MACHINE(xenfv_4_2, "xenfv-4.2", pc_xen_hvm_init, @@ -999,7 +999,7 @@ static void xenfv_3_1_machine_options(MachineClass *m) m->desc =3D "Xen Fully-virtualized PC"; m->alias =3D "xenfv"; m->max_cpus =3D HVM_MAX_VCPUS; - m->default_machine_opts =3D "accel=3Dxen"; + m->default_machine_opts =3D "accel=3Dxen,suppress-vmdesc=3Don"; } =20 DEFINE_PC_MACHINE(xenfv, "xenfv-3.1", pc_xen_hvm_init, --=20 2.25.1