[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [libvirt] [PATCH] libxl: detect support for save and restore
Eric Blake wrote: > On 06/25/2014 12:13 PM, Jim Fehlig wrote: > >> libxl does not support save, restore, or migrate on all architectures, >> notably ARM. Detect whether libxl supports these operations using >> LIBXL_HAVE_NO_SUSPEND_RESUME. If not supported, drop advertisement of >> <migration_features>. >> >> Found by Ian Campbell while improving Xen's OSSTEST infrastructure >> >> http://lists.xen.org/archives/html/xen-devel/2014-06/msg02171.html >> Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx> >> --- >> >> Derived from a test patch I sent to Ian Campbell >> >> http://lists.xen.org/archives/html/xen-devel/2014-06/msg03150.html >> >> Includes fixups Ian provided later in the thread. >> >> src/libxl/libxl_conf.c | 4 ++++ >> src/libxl/libxl_driver.c | 8 ++++++++ >> 2 files changed, 12 insertions(+) >> > > >> >> +#ifndef LIBXL_HAVE_NO_SUSPEND_RESUME >> > > Double negative logic is hard to read. Oh well. > > > >> >> static virDriver libxlDriver = { >> @@ -4594,10 +4598,12 @@ static virDriver libxlDriver = { >> .domainSetMemoryFlags = libxlDomainSetMemoryFlags, /* 0.9.0 */ >> .domainGetInfo = libxlDomainGetInfo, /* 0.9.0 */ >> .domainGetState = libxlDomainGetState, /* 0.9.2 */ >> +#ifndef LIBXL_HAVE_NO_SUSPEND_RESUME >> .domainSave = libxlDomainSave, /* 0.9.2 */ >> .domainSaveFlags = libxlDomainSaveFlags, /* 0.9.4 */ >> .domainRestore = libxlDomainRestore, /* 0.9.2 */ >> .domainRestoreFlags = libxlDomainRestoreFlags, /* 0.9.4 */ >> +#endif >> > > Hmm - do we do conditional registration in any other driver based on > configure-time results? I'd almost rather always provide the driver > registration, and then use #ifdefs in the body of that function to > either provide a sane result or else report that the compilation > environment was too old, rather than omit the support altogether. I sent a V2 which takes your preferred approach https://www.redhat.com/archives/libvir-list/2014-June/msg01305.html > Maybe get Dan's opinion on this? > Ok. I lean towards V2 since it avoids the double negative. Regards, Jim _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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