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Message-ID: <506DEC95.8050806@hp.com> Date: Thu, 04 Oct 2012 14:07:49 -0600 From: Randy Wright <rwright@...com> To: Matthew Garrett <mjg@...hat.com> CC: linux-kernel@...r.kernel.org, tmac@...com, hpa@...or.com, rwright@...com Subject: Re: [PATCH] Fix devmem_is_allowed for below 1MB accesses for an efi machine On 10/02/2012 11:20 PM, Matthew Garrett wrote: > Oh, right, got you. In that case I think we potentially need a > finer-grained check on EFI platforms - the EFI memory map is kind enough > to tell us the difference between unusable regions and io regions, and > we could avoid access to the unusable ones. I wanted to mention in this context a patch RFC I posted yesterday as a distinct thread which is visible as https://lkml.org/lkml/2012/10/3/589 with the subject: [PATCH RFC] function probe_roms accessing improper addresses on UEFI systems. While the mechanism is different from Tmac's patch (because probe_roms runs early in boot, prior to resource structure initialization) the intent of the change is the same: to prevent a machine check resulting from access to inappropriate physical addresses. I will monitor both this thread as well as my own recent RFC posting since the underlying issues are common. -- Randy Wright <rwright@...com> +1-970-898-0998 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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