[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH-for-4.13 v5] Rationalize max_grant_frames and max_maptrack_frames handling
On 29.11.2019 11:39, Durrant, Paul wrote: >> -----Original Message----- >> From: Jan Beulich <jbeulich@xxxxxxxx> >> Sent: 29 November 2019 10:29 >> To: Durrant, Paul <pdurrant@xxxxxxxxxx> >> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>; Anthony PERARD >> <anthony.perard@xxxxxxxxxx>; George Dunlap <george.dunlap@xxxxxxxxxx>; >> Roger Pau Monné <roger.pau@xxxxxxxxxx>; Volodymyr Babchuk >> <Volodymyr_Babchuk@xxxxxxxx>; George Dunlap <George.Dunlap@xxxxxxxxxxxxx>; >> Ian Jackson <ian.jackson@xxxxxxxxxxxxx>; Marek Marczykowski-Górecki >> <marmarek@xxxxxxxxxxxxxxxxxxxxxx>; Stefano Stabellini >> <sstabellini@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx; Konrad Rzeszutek >> Wilk <konrad.wilk@xxxxxxxxxx>; Julien Grall <julien@xxxxxxx>; Wei Liu >> <wl@xxxxxxx> >> Subject: Re: [PATCH-for-4.13 v5] Rationalize max_grant_frames and >> max_maptrack_frames handling >> >> On 29.11.2019 11:22, Jan Beulich wrote: >>> On 28.11.2019 17:52, Paul Durrant wrote: >>>> --- a/xen/common/grant_table.c >>>> +++ b/xen/common/grant_table.c >>>> @@ -84,11 +84,40 @@ struct grant_table { >>>> struct grant_table_arch arch; >>>> }; >>>> >>>> +static int parse_gnttab_limit(const char *param, const char *arg, >>>> + unsigned int *valp) >>>> +{ >>>> + const char *e; >>>> + unsigned long val; >>>> + >>>> + val = simple_strtoul(arg, &e, 0); >>>> + if ( *e ) >>>> + return -EINVAL; >>>> + >>>> + if ( val > INT_MAX ) >>>> + return -ERANGE; >>>> + >>>> + return 0; >>>> +} >>> >>> *valp doesn't get written to anymore. > > That was intentional, given Juergen's comment... > >> With this fixed (and no new >>> issues introduced ;-) ) hypervisor side >>> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> >> >> And I guess I should have clarified: I'd be fine adding the missing >> assignment while committing, provided the tools side won't require >> any changes. > > ...but if we want to allow dom0 to set itself up for INT_MAX frames > in the event of a bad value then I'm not objecting. Looks like you're misunderstanding, or I'm missing something: The command line options right now won't take any effect, as the opt_* global variables won't be written to at all. I'm not taking about falling back to using INT_MAX when we've noticed an out of bounds value. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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