[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: RFC Patch for the "x86-64, mm: Put early page table high"
On 04/29/2011 02:33 PM, Konrad Rzeszutek Wilk wrote: > On Fri, Apr 29, 2011 at 01:58:33PM -0700, Jeremy Fitzhardinge wrote: >> On 04/29/2011 08:46 AM, Konrad Rzeszutek Wilk wrote: >>> Without a fix for this 2.6.39-rc5 fails during bootup. >>> >>> It fails such early, you only Xen telling you that the domain crashed. >>> >>> There is one patch to fix this, and the last word was here: >>> http://marc.info/?i=4DAF0ECB.8060009@xxxxxxxx >>> >>> But after nothing had been heard from Peter. >>> >>> So I decided to look at this from a different perspective: why not >>> contain the workaround inside Xen early bootup code. >>> >>> I've tested this code as DomU (1G, 2G, 3G), Dom0 (8G, 4G, 1000M) >>> and they all booted fine. Hadn't compile tested it on 32-bit and >>> I think it will actually complain about it. Let me fix that. >>> >>> See attached patch (also present in stable/bug-fixes-for-rc5) which also >>> has the "xen: mask_rw_pte mark RO all pagetable pages up to pgt_buf_top" >>> integrated in. >> Well, if we can hide the fix away in our code, then that has obvious >> advantages. But I worry that this change is pretty closely dependent on >> how the other code works, and would be fragile in the face of further >> changes to that code (esp since there's no obvious coupling between the >> two, so anyone changing the arch/x86 code wouldn't have any clues to >> look at the corresponding Xen code). > True. I am hoping to remove this in 2.6.40 though... That makes it more palatable. What's the solution for 40+? J _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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