On Fri, Oct 26, 2007 at 11:18:49AM -0700, Mark Gross wrote:
> The following patch clears the portect memory region enable bit at
> boot time by default. It also provides a kernel parrameter for
> disabling this behavior and leave the PMEN_REG untouched if so
> wanted.
>
> If the boot loader or platform has protected memory regions enabled
> at boot time it could prevent DMA's from happening as drivers are
> loaded and used.
What's the value of adding a command line option for this? Under what
circumstances would we want to not clear this bit?
> + } else if (!strncmp(str, "no_epm_clear", 12)) {
> + printk(KERN_INFO
> + "Intel-IOMMU: subress clearing of Enable "
> + "Protected Memory bit\n");
> + clear_pmen_epm = 0;
`suppress', I assume. Rest looks fine, if the configuration option is
really needed.
Cheers,
Muli
--
SYSTOR 2007 --- 1st Annual Haifa Systems and Storage Conference 2007
http://www.haifa.il.ibm.com/Workshops/systor2007/
Virtualization workshop: Oct 29th, 2007 | Storage workshop: Oct 30th, 2007
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
