[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] [Xen] Check FADT's signature
> Okay, please try tip of staging tree (c/s 15773). This solves the problem with mapping ACPI memory and the timer address is read correctly. Thanks! Stefan > > -- Keir > > On 24/8/07 07:19, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote: > > xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 08/10/2007 09:15:57 PM: > > > A good debugging approach will be to write a function that walks the > > pagetables for that virtual address and prints the PTE that maps it. > > Scatter calls to this function between acpi_boot_table_init() and > > acpi_boot_init() and hence narrow down exactly where the PTE is > > getting zapped. > > What is happening is that the pl1e pointer used for mapping the ACPI > table entry changes between the calls before paging_init() and > after. The l1_pgentry_t that is used before paging_init() correctly > shows that the page is present whereas the one used after indicates > that the page is not present. Then when the ACPI table is mapped > after paging_init() the tlb is not flushed and wrong information is read. > > Stefan > > > > > -- Keir > > > > On 10/8/07 19:21, "Keir Fraser" <keir@xxxxxxxxxxxxx> wrote: > > > On 10/8/07 18:00, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote: > > > (XEN) map_pages_to_xen : 3533 > > (that's the line number) > > (XEN) 0xfff9b000 was NOT present. > > > > Something between (*) and here seems to trash this presence flag. > > paging_init() and many others lie in between the upper call and this > > one here. Could be a side effect of this? Maybe that tlb flush at > > the right place in one of these functions would solve the problem? > > > > Yes, this now looks likely and that’s rather scary. We’ll go after > > this next week. > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@xxxxxxxxxxxxxxxxxxx > > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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