[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] Re: [PATCH][VTD] check BIOS settings before enabling interrupt remapping or x2apic
Jan Beulich wrote on 2011-04-05: >>>> On 29.03.11 at 19:58, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote: >> Check flags field in ACPI DMAR structure before enabling interrupt >> remapping or x2apic. This allows platform vendors to disable interrupt >> remapping or x2apic features if on board BIOS does not support them. >> >> Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx> > > Taking a second look (while trying to merge this into our SLE11 code > base), I think this > >> @@ -761,7 +762,11 @@ out: >> >> int __init acpi_dmar_init(void) >> { >> + struct acpi_table_dmar *dmar; >> + >> acpi_get_table(ACPI_SIG_DMAR, 0, &dmar_table); >> + dmar = (struct acpi_table_dmar *) dmar_table; >> + dmar_flags = dmar->flags; >> >> return parse_dmar_table(acpi_parse_dmar); >> } > > is wrong from a TXT perspective - the table obtained here must only be > used for the signature zapping activity, nothing else. All decisions > must be based upon what gets passed to acpi_parse_dmar(). (This would > at once reduce the size of the change, since a cast struct > acpi_table_dmar * is already available there.) > > Jan You are right. Take TXT into consideration, we should check the dmar table passed to acpi_parse_dmar(), and should not check the dmar_table directly. Jimmy _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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