[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v5 COLOPre 08/18] tools/libxl: introduce libxl__domain_restore_device_model to load qemu state
On Thu, Dec 17, 2015 at 03:48:12PM +0800, Wen Congyang wrote: > From: Yang Hongyang <hongyang.yang@xxxxxxxxxxxx> > > In normal migration, the qemu state was passed to qemu as a parameter. /was/is/ > With COLO, Secondary vm is running. So we will do the following steps > at every checkpoint: > 1. suspend both primary vm and secondary vm > 2. sync the state > 3. resume both primary vm and secondary vm > Primary will send qemu's state in step2, and > Secondary's qemu should read it and restore the state before it s/Secondary/secondary/ > is resumed. We can not pass the state to qemu as a parameter because > Secondary QEMU already started at this point, so we introduce s/Secondary/secondary/ > libxl__domain_restore_device_model() to do it. > This API should be called before resuming secondary vm. s/before/MUST/ > > Signed-off-by: Yang Hongyang <hongyang.yang@xxxxxxxxxxxx> > Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx> > Cc: Anthony Perard <anthony.perard@xxxxxxxxxx> > --- > tools/libxl/libxl_dom_save.c | 20 ++++++++++++++++++++ > tools/libxl/libxl_internal.h | 4 ++++ > tools/libxl/libxl_qmp.c | 10 ++++++++++ > 3 files changed, 34 insertions(+) > > diff --git a/tools/libxl/libxl_dom_save.c b/tools/libxl/libxl_dom_save.c > index 0bfa5fc..88cb1b3 100644 > --- a/tools/libxl/libxl_dom_save.c > +++ b/tools/libxl/libxl_dom_save.c > @@ -609,6 +609,26 @@ int > libxl__restore_emulator_xenstore_data(libxl__domain_create_state *dcs, > return rc; > } > > +int libxl__domain_restore_device_model(libxl__gc *gc, uint32_t domid, > + const char *restore_file) > +{ > + int rc; > + > + switch (libxl__device_model_version_running(gc, domid)) { > + case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL: > + /* not supported now */ Perhaps: Will never be supported. > + rc = ERROR_INVAL; > + break; > + case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN: > + rc = libxl__qmp_restore(gc, domid, restore_file); > + break; > + default: > + rc = ERROR_INVAL; > + } > + > + return rc; > +} > + _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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